Article: 95909 of rec.radio.amateur.homebrew From: James Sweet Subject: Re: Favorite Tektronix Scope References: <1136148561.946351.257400@g44g2000cwa.googlegroups.com> <6hZtf.3293$vL4.3204@bignews1.bellsouth.net> <43b8d277.34617210@free.teranews.com> <43b9cdbd.20688672@free.teranews.com> <43BCB1D1.4020800@worldnet.att.net> <%Invf.20506$If.14477@trnddc05> Message-ID: Date: Sat, 07 Jan 2006 03:37:20 GMT > > You obviously haven't hired a machinist lately. In pristine shape, the > scopes were worth $75 tops, the machine shops charge $100/hour, 1 hour > minimum. > > I was going to do the job myself, but balked because even when I was done, > all I would have was a bunch of scopes that no one wanted to buy. We had > them (with the broken/missing knobs in the $15 pile at several hamfests, > and they went nowhere. > Well no I haven't hired one because friends of mine own a machine shop so I can get favors like that for free but still, $75 tops? We're talking a pretty decent scope aren't we? When I bought my Tek 465 a few years ago I couldn't find anything 100MHz dual trace in working order for under $275 or so. Article: 95910 of rec.radio.amateur.homebrew From: "Samuel Hunt" Subject: FX5000 external frequency input? Date: Sat, 7 Jan 2006 11:09:25 +0000 (UTC) Message-ID: Does anyone happen to know the jumpers to set in the transmitter to make the FX5000 accept an external frequency input? I would like to run the transmitter from an external 1mhz reference (I believe that's the frequency it needs?) Ta, sam Article: 95911 of rec.radio.amateur.homebrew From: xray Subject: Re: Favorite Tektronix Scope Date: Sat, 07 Jan 2006 04:38:08 -0800 Message-ID: References: <1136148561.946351.257400@g44g2000cwa.googlegroups.com> <29ijr15923pim2ih03vovp4rsr3mea6ihl@4ax.com> On Tue, 03 Jan 2006 21:03:29 GMT, Ignoramus29795 wrote: >I changed my mind. I will not sell my 475. > >Now... I have little interest in homemade radio or audio stuff. So far >my little forays into electronics centered around power electronics. >Given that... Is there any possible reason to keep a spectrum >analyzer? Sorry, I'm late to this thread but thought I'd add an opinion. No, Spectum Analysers are useless for anyone outside the government or RF extremists. What are the specifications of the one you have? Maybe I can save you grief by taking it off your hands with a preimuim bid since it is just a glorified scope? P.s. You never answered if the Motorcycle engine you are selling is the one that came by accident. Article: 95912 of rec.radio.amateur.homebrew From: "Walter Raleigh" References: <1136619271.789630.294240@z14g2000cwz.googlegroups.com> <1136622897.249261.173890@z14g2000cwz.googlegroups.com> <3a5vr1h0lrbu5oj938epahm7io3sv6goj7@4ax.com> Subject: Re: more hate filled shit Message-ID: Date: Sat, 7 Jan 2006 13:13:27 -0000 "Walt Davidson" wrote in message news:3a5vr1h0lrbu5oj938epahm7io3sv6goj7@4ax.com... > On 7 Jan 2006 01:01:15 -0800, "an old friend" > wrote: > >>cuting the reption of hate filled shit > > How on earth does a person "cute reption"? > I thought I kill-filed that moron... -- vy 73 de Walter R. Article: 95913 of rec.radio.amateur.homebrew From: "SJC" References: <1136229191.768561.62190@g49g2000cwa.googlegroups.com> <1136516117.111999.263150@o13g2000cwo.googlegroups.com> <1136570313.368015.312020@g44g2000cwa.googlegroups.com> Subject: Re: Building a "Robinson Crusoe" Battery Message-ID: Date: Sat, 07 Jan 2006 16:44:12 GMT "Too_Many_Tools" wrote in message news:1136570313.368015.312020@g44g2000cwa.googlegroups.com... > "Robinson 'could'--with nothing more than the battery and some > wire--transmit radio signals in Morse.... > No accounting for range, of course. > jak " > > True...but this just shows how important the battery really is...and > that is why I chose to make it the main focus of Crusoe's efforts to > get attention. > > TMT > It seems that if he is really into renewable and sustainable, he does not have to be rescued at all. Article: 95914 of rec.radio.amateur.homebrew From: Paul Burridge Subject: Re: Favorite Tektronix Scope Date: Sat, 07 Jan 2006 16:55:00 +0100 Message-ID: References: <1136148561.946351.257400@g44g2000cwa.googlegroups.com> <29ijr15923pim2ih03vovp4rsr3mea6ihl@4ax.com> On Sat, 07 Jan 2006 04:38:08 -0800, xray wrote: >Sorry, I'm late to this thread but thought I'd add an opinion. No one can stop you doing that. >No, Spectum Analysers are useless for anyone outside the government or >RF extremists. ??? Er, they're extremely useful pieces of test gear for anyone involved in RF., even hobbyists. >What are the specifications of the one you have? Maybe I can save you >grief by taking it off your hands with a preimuim bid since it is just a >glorified scope? It's a different thing altogether! Barely a week went by before I deeply regretted parting with my spectrum analyser. :-( -- "What is now proved was once only imagin'd" - William Blake Article: 95915 of rec.radio.amateur.homebrew From: class-a-licensee-pkearn-zaapk@didnt-run-away-from-a-morse-test.es.eircom.com.net (zAAPK) Subject: Re: more hate filled shit Date: Sat, 07 Jan 2006 17:13:33 GMT Message-ID: <43bff6aa.1427138@news.iol.ie> References: <1136619271.789630.294240@z14g2000cwz.googlegroups.com> <1136622897.249261.173890@z14g2000cwz.googlegroups.com> <3a5vr1h0lrbu5oj938epahm7io3sv6goj7@4ax.com> "Walter Raleigh" wrote: > > "Walt Davidson" wrote in message > news:3a5vr1h0lrbu5oj938epahm7io3sv6goj7@4ax.com... > > On 7 Jan 2006 01:01:15 -0800, "an old friend" > > wrote: > > > >>cuting the reption of hate filled shit > > > > How on earth does a person "cute reption"? > > > > I thought I kill-filed that moron... what ANOTHER U-TURN ? typical b-licensee. Article: 95916 of rec.radio.amateur.homebrew From: "Rich Grise, but drunk" Subject: Re: Favorite Tektronix Scope Message-ID: References: <1136148561.946351.257400@g44g2000cwa.googlegroups.com> <29ijr15923pim2ih03vovp4rsr3mea6ihl@4ax.com> Date: Sat, 07 Jan 2006 18:38:10 GMT On Sat, 07 Jan 2006 16:55:00 +0100, Paul Burridge wrote: > On Sat, 07 Jan 2006 04:38:08 -0800, xray > wrote: > >>Sorry, I'm late to this thread but thought I'd add an opinion. > > No one can stop you doing that. > >>No, Spectum Analysers are useless for anyone outside the government or >>RF extremists. > > ??? > Er, they're extremely useful pieces of test gear for anyone involved > in RF., even hobbyists. Not to mention incredible amounts of fun! :-) :-) :-) (look at a pulse's spectrum sometime, and twirl the PRF and PW knobs and watch the pretty pictures dance...) >>What are the specifications of the one you have? Maybe I can save you >>grief by taking it off your hands with a preimuim bid since it is just a >>glorified scope? > > It's a different thing altogether! > > Barely a week went by before I deeply regretted parting with my > spectrum analyser. :-( Not only that, but its very name is ripe for _so_ many play-on-words jokes! "rectum analyzer?" "spectrum ANAL-izer?" etc.... ;-) Cheers! Rich Article: 95917 of rec.radio.amateur.homebrew From: "RST Engineering" Subject: Doppler Radar Date: Sat, 7 Jan 2006 11:28:12 -0800 Message-ID: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> Back in the '60s and early '70s I did some work with Impatt and Gunn diodes, building a little self-detecting doppler for speed sensing. However, 35 years have passed and my notebooks for that stuff are somewhere in a dusty archive along with my venerable sliderule. Is there a cheap source for onesies-twosies of a radar front-end that will give me doppler audio as a function of a large metal object's speed at a range of 20 meters or so? I don't need to go into production on this thing, just build one. A surplus source would be ideal. It seems that the little kids on our rural country lane have all become teenagers at once and are trying to outdo the others in how fast they can drive daddy's car up and down the lane. We've lost one dog this week and unless I can put up some sort of a siren that goes off when they exceed some agreed upon limit, the carnage will continue. Regards, Jim Article: 95918 of rec.radio.amateur.homebrew From: Bill Janssen Subject: Re: Doppler Radar References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> Message-ID: Date: Sat, 07 Jan 2006 19:41:41 GMT RST Engineering wrote: >Back in the '60s and early '70s I did some work with Impatt and Gunn diodes, >building a little self-detecting doppler for speed sensing. However, 35 >years have passed and my notebooks for that stuff are somewhere in a dusty >archive along with my venerable sliderule. > >Is there a cheap source for onesies-twosies of a radar front-end that will >give me doppler audio as a function of a large metal object's speed at a >range of 20 meters or so? I don't need to go into production on this thing, >just build one. A surplus source would be ideal. > >It seems that the little kids on our rural country lane have all become >teenagers at once and are trying to outdo the others in how fast they can >drive daddy's car up and down the lane. We've lost one dog this week and >unless I can put up some sort of a siren that goes off when they exceed some >agreed upon limit, the carnage will continue. > > >Regards, > > >Jim > > > > > Yep they are available. I have about a dozen or so of Gunn units that came from 10 GHz door opening bits They have the Gunn diode and a detector diode. The rest of the electronics I threw away. Two of them can be sent for the cost of postage. Bill K7NOM Article: 95919 of rec.radio.amateur.homebrew Message-ID: <43C019C6.1090301@invalid.invalid> From: Doug Smith W9WI Subject: Re: Doppler Radar References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> Date: Sat, 07 Jan 2006 19:43:09 GMT RST Engineering wrote: > It seems that the little kids on our rural country lane have all become > teenagers at once and are trying to outdo the others in how fast they can > drive daddy's car up and down the lane. We've lost one dog this week and > unless I can put up some sort of a siren that goes off when they exceed some > agreed upon limit, the carnage will continue. I realize this is way off the subject, and I do honestly wish you success in getting the neighborhood speed demons under control, but... as a bicyclist, I find it necessary to point out... that if the neighborhood dogs are being hit by speeders, those dogs are obviously in the road. They shouldn't be. -- Doug Smith W9WI Pleasant View (Nashville), TN EM66 http://www.w9wi.com Article: 95920 of rec.radio.amateur.homebrew From: "RST Engineering" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <43C019C6.1090301@invalid.invalid> Subject: Re: Doppler Radar Date: Sat, 7 Jan 2006 11:47:22 -0800 Message-ID: <525cb$43c01ac5$4251d54c$723@DIALUPUSA.NET> Neither should little kids, but poo happens. With dogs it's "I'm sorry". With kids it's manslaughter. Jim "Doug Smith W9WI" wrote in message news:43C019C6.1090301@invalid.invalid... > > as a bicyclist, I find it necessary to point out... that if the > neighborhood dogs are being hit by speeders, those dogs are obviously in > the road. They shouldn't be. > -- > Doug Smith W9WI > Pleasant View (Nashville), TN EM66 > http://www.w9wi.com > Article: 95921 of rec.radio.amateur.homebrew From: Jim Thompson Subject: Re: Doppler Radar Message-ID: References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> Date: Sat, 07 Jan 2006 13:01:40 -0700 On Sat, 7 Jan 2006 11:28:12 -0800, "RST Engineering" wrote: >Back in the '60s and early '70s I did some work with Impatt and Gunn diodes, >building a little self-detecting doppler for speed sensing. However, 35 >years have passed and my notebooks for that stuff are somewhere in a dusty >archive along with my venerable sliderule. > >Is there a cheap source for onesies-twosies of a radar front-end that will >give me doppler audio as a function of a large metal object's speed at a >range of 20 meters or so? I don't need to go into production on this thing, >just build one. A surplus source would be ideal. > >It seems that the little kids on our rural country lane have all become >teenagers at once and are trying to outdo the others in how fast they can >drive daddy's car up and down the lane. We've lost one dog this week and >unless I can put up some sort of a siren that goes off when they exceed some >agreed upon limit, the carnage will continue. > > >Regards, > > >Jim > > IIRC I've seen police radar guns as surplus. It's been quite a few years ago now, so I don't recall the details, but I bought a "sports gun" for my youngest that he used at dragster events. I think it was about $100. ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. Article: 95922 of rec.radio.amateur.homebrew From: "Rather Play Pinball" <123@abc.net> References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> Subject: Re: Doppler Radar Message-ID: Date: Sat, 7 Jan 2006 16:06:31 -0500 Do a looksie on E-Pay, cheap old style X and K band units are available. With a 12vDC power supply, you can have your very own source. Even if you just buy the head without the counter, the 12vdc will supply the head and it will put out. Do NOT purchase the Ramsey "kit" for this applicaiton. While it may be fun for a budding electronics wanna-be, it does not put out at a frequency that will trigger radar detectors. Jack Article: 95923 of rec.radio.amateur.homebrew From: microwaves@blueyonder.co.uk (Peter) Subject: Re: Doppler Radar Message-ID: <43c02f51.205440678@news.blueyonder.co.uk> References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> Date: Sat, 07 Jan 2006 21:18:05 GMT On Sat, 7 Jan 2006 11:28:12 -0800, "RST Engineering" wrote: >Back in the '60s and early '70s I did some work with Impatt and Gunn diodes, >building a little self-detecting doppler for speed sensing. However, 35 >years have passed and my notebooks for that stuff are somewhere in a dusty >archive along with my venerable sliderule. Jim, take a look at www.shfmicro.com where you'll find 10GHz and 24GHz doppler modules for sale at very favourable prices. They would certainly be very useful for what you have in mind. Good luck.. Peter, G3PHO UK Microwave Group www.microwavers.org www.g3pho.org.uk Article: 95924 of rec.radio.amateur.homebrew From: Joerg Subject: Re: Doppler Radar References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <43C019C6.1090301@invalid.invalid> <525cb$43c01ac5$4251d54c$723@DIALUPUSA.NET> Message-ID: Date: Sat, 07 Jan 2006 21:43:01 GMT Hello Jim, > Neither should little kids, but poo happens. With dogs it's "I'm sorry". ... Not necessarily. It can become wrongful death but you'd have to have proof of grossly excessive speed. Skidmarks can be such proof if a car doesn't have ALB. But, of course, the experts for that usually only come out when a person has been hit. Regards, Joerg http://www.analogconsultants.com Article: 95925 of rec.radio.amateur.homebrew From: "RST Engineering \(jw\)" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> Subject: Re: Doppler Radar Date: Sat, 7 Jan 2006 14:15:11 -0800 Message-ID: Why would I care if it triggered a radar detector? In fact, it would be BETTER if it didn't trigger a detector. Jim "Rather Play Pinball" <123@abc.net> wrote in message news:s3Wvf.2596$5g1.1948@fe02.lga... > > Do NOT purchase the Ramsey "kit" for this applicaiton. While it may be > fun for a budding electronics wanna-be, it does not put out at a frequency > that will trigger radar detectors. > > Jack > > > > Article: 95926 of rec.radio.amateur.homebrew From: "RST Engineering \(jw\)" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <43c02f51.205440678@news.blueyonder.co.uk> Subject: Re: Doppler Radar Date: Sat, 7 Jan 2006 14:19:22 -0800 Message-ID: <7452e$43c03e65$4251d54c$3207@DIALUPUSA.NET> Peter, thanks, but they are a bit pricey for what I have in mind. Jim "Peter" wrote in message news:43c02f51.205440678@news.blueyonder.co.uk... > On Sat, 7 Jan 2006 11:28:12 -0800, "RST Engineering" > wrote: > > > > Jim, take a look at www.shfmicro.com where you'll find 10GHz and > 24GHz doppler modules for sale at very favourable prices. They would > certainly be very useful for what you have in mind. Article: 95927 of rec.radio.amateur.homebrew Subject: 1N4007 varactors From: JE Message-ID: Date: Sat, 07 Jan 2006 17:26:23 -0500 The common 1N4007 seem to work for HF but what is the max. frequency they can be used as varactors? And how about zener diodes? JE Article: 95928 of rec.radio.amateur.homebrew From: "Howard" Subject: PIC Based Freq Readout Message-ID: Date: Sat, 07 Jan 2006 22:45:02 GMT Does anyone have circuit and software listing for PIC based freq readout, preferably with IF offset. 16F84 would be ideal. I've tried to contact IK3OIL for the software for his counter but am unable to. Thanks. Howard G3UPZ Article: 95929 of rec.radio.amateur.homebrew From: "RST Engineering" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> Subject: Re: Doppler Radar Date: Sat, 7 Jan 2006 14:47:08 -0800 Message-ID: <23e07$43c044e8$4251d54c$3390@DIALUPUSA.NET> What illegal? I can either retune it for a ham band or reduce power if necessary. I'll find the hardware first and figure out the legal later. Jim "Wes Stewart" wrote in message > > But what the heck, if you're going to set up an illegal transmitter, > might as well use one big enough to reset the ECM in their cars. Article: 95930 of rec.radio.amateur.homebrew From: "Ken Taylor" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> Subject: Re: Doppler Radar Message-ID: Date: Sun, 8 Jan 2006 12:13:49 +1300 "RST Engineering (jw)" wrote in message news:c7d1b$43c03d6a$4251d54c$3192@DIALUPUSA.NET... > Why would I care if it triggered a radar detector? In fact, it would be > BETTER if it didn't trigger a detector. > > Jim > Why? Don't you intend to trigger a siren to slow them down? What's it matter if they slow down because of their dectors - they slow down, and that would appear to be the important thing. Cheers. Ken > > "Rather Play Pinball" <123@abc.net> wrote in message > news:s3Wvf.2596$5g1.1948@fe02.lga... > > > > Do NOT purchase the Ramsey "kit" for this applicaiton. While it may be > > fun for a budding electronics wanna-be, it does not put out at a frequency > > that will trigger radar detectors. > > > > Jack > > > > > > > > > > Article: 95931 of rec.radio.amateur.homebrew From: "Ken Taylor" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <43c02f51.205440678@news.blueyonder.co.uk> <7452e$43c03e65$4251d54c$3207@DIALUPUSA.NET> Subject: Re: Doppler Radar Message-ID: Date: Sun, 8 Jan 2006 12:16:02 +1300 There's a radar speed gun on Ebay *NOW* (not mine, so technically this isn't spam...:-) Cheers. Ken "RST Engineering (jw)" wrote in message news:7452e$43c03e65$4251d54c$3207@DIALUPUSA.NET... > Peter, thanks, but they are a bit pricey for what I have in mind. > > Jim > > > "Peter" wrote in message > news:43c02f51.205440678@news.blueyonder.co.uk... > > On Sat, 7 Jan 2006 11:28:12 -0800, "RST Engineering" > > wrote: > > > > > > > > > > Jim, take a look at www.shfmicro.com where you'll find 10GHz and > > 24GHz doppler modules for sale at very favourable prices. They would > > certainly be very useful for what you have in mind. > > Article: 95932 of rec.radio.amateur.homebrew From: "Brian" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> Subject: Re: Doppler Radar Message-ID: <1yYvf.31090$q4.16432@newsfe2-gui.ntli.net> Date: Sat, 07 Jan 2006 23:55:41 GMT "RST Engineering" wrote in message news:5f129$43c01647$4251d54c$538@DIALUPUSA.NET... What a waste of time! If you have a problem with speeding cars just phone the police, or video record it and phone them at a later date. Also don't be irresponsible and let dogs out as they might cause an accident or get killed if they run across roads infront of cars. Article: 95933 of rec.radio.amateur.homebrew From: "Brian" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <43C019C6.1090301@invalid.invalid> <525cb$43c01ac5$4251d54c$723@DIALUPUSA.NET> Subject: Re: Doppler Radar Message-ID: Date: Sun, 08 Jan 2006 00:00:10 GMT "RST Engineering" wrote in message news:525cb$43c01ac5$4251d54c$723@DIALUPUSA.NET... > Neither should little kids, but poo happens. With dogs it's "I'm sorry". > With kids it's manslaughter. > > Jim > > > > "Doug Smith W9WI" wrote in message > news:43C019C6.1090301@invalid.invalid... >> >> as a bicyclist, I find it necessary to point out... that if the >> neighborhood dogs are being hit by speeders, those dogs are obviously in >> the road. They shouldn't be. >> -- >> Doug Smith W9WI >> Pleasant View (Nashville), TN EM66 >> http://www.w9wi.com >> > > RESPONSIBLE parents do not let their children run out in the road, idiots that allow dogs to run free in the road need to be aware that they can cause accidents. I do hope the pathetic owner is held responsible when a dog which is out of control runs out and causes an accident. Two seperate arguments, you need to be clear of what it is you want. Jealousy is a terrible thing, so if that's all it's down to then give up. That is wht it comes across as. The people concerned probably have their own cars and don't expect some idiot to allow a dog to run infront of them in the hope they will hit it. Were you after an insurance claim? Keep the dogs under control as responsible people keep their children under control. Article: 95934 of rec.radio.amateur.homebrew From: "Brian" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <43C019C6.1090301@invalid.invalid> <525cb$43c01ac5$4251d54c$723@DIALUPUSA.NET> Subject: Re: Doppler Radar Message-ID: Date: Sun, 08 Jan 2006 00:01:57 GMT "Joerg" wrote in message news:FBWvf.42956$dO2.13349@newssvr29.news.prodigy.net... > Hello Jim, > > >> Neither should little kids, but poo happens. With dogs it's "I'm sorry". >> ... > > > Not necessarily. It can become wrongful death but you'd have to have proof > of grossly excessive speed. Skidmarks can be such proof if a car doesn't > have ALB. But, of course, the experts for that usually only come out when > a person has been hit. > > Regards, Joerg > No idea what you mean by ALB as abbreviations are only good for those who all have an understanding of what is meant. If you refer to a car with antilock brakes then they DO leave marks that can be identified. I have investigated enough accident scenes that leave the same tell tale signs. Boy racers with antilock brakes all assume they can go faster and no one will know. How wrong they are. Article: 95935 of rec.radio.amateur.homebrew From: "RST Engineering" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> Subject: Re: Doppler Radar Date: Sat, 7 Jan 2006 16:05:43 -0800 Message-ID: A) We aren't in a "town", rather we are pretty far out into the country. B) It is a private dead-end road owned in mutual easement between the four families that live at the end of it about half a mile off the county road that serves it. The county mounties have nothing to say about what goes on on the road. C) I realize that this is newsnet and anything goes, but why can't you just ATFQ? Jim > Go to your local police department and have them monitor the speeders with > a > automated speed display unit. What! they don't have one in your town? > bring it > up at the next town meeting... ;) Article: 95936 of rec.radio.amateur.homebrew From: Joerg Subject: Re: Doppler Radar References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <43C019C6.1090301@invalid.invalid> <525cb$43c01ac5$4251d54c$723@DIALUPUSA.NET> Message-ID: Date: Sun, 08 Jan 2006 00:22:14 GMT Hallo Brian, > > No idea what you mean by ALB as abbreviations are only good for those who > all have an understanding of what is meant. I used ALB because it was on the insurance papers. They give a discount for that feature. In Europe they mostly call it ABS. > If you refer to a car with antilock brakes then they DO leave marks that can > be identified. I have investigated enough accident scenes that leave the > same tell tale signs. Boy racers with antilock brakes all assume they can > go faster and no one will know. How wrong they are. > > True, they do leave regulation patterns. But an accident investigator told me they are pretty faint and wear off faster by traffic. Regards, Joerg http://www.analogconsultants.com Article: 95937 of rec.radio.amateur.homebrew From: Joerg Subject: Re: Doppler Radar References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <43C019C6.1090301@invalid.invalid> <525cb$43c01ac5$4251d54c$723@DIALUPUSA.NET> Message-ID: Date: Sun, 08 Jan 2006 00:28:59 GMT Hello Brian, > Keep the dogs under control as responsible people keep their children under > control. > > Even then it can still happen and we all have to use our cars carefully. One kid didn't get injured because I was going 15mph in a 25mph zone (the street where we live). It dashed out when the garage was opened, zooming into the road from behind a van. Couldn't see it coming but I never go faster on that street, for that very reason. I came to a stop about one foot before the child. Regards, Joerg http://www.analogconsultants.com Article: 95938 of rec.radio.amateur.homebrew From: Allodoxaphobia Subject: Re: 1N4007 varactors Date: 8 Jan 2006 00:41:32 GMT Message-ID: References: On Sat, 07 Jan 2006 17:26:23 -0500, JE wrote: > The common 1N4007 seem to work for HF but what is the max. frequency > they can be used as varactors? > > And how about zener diodes? I'd expect that all to depend on manufacturer (and, even, date code.) HNY es 73 Jonesy -- Marvin L Jones | jonz | W3DHJ | linux Pueblo, Colorado | @ | Jonesy | OS/2 __ 38.24N 104.55W | config.com | DM78rf | SK Article: 95939 of rec.radio.amateur.homebrew From: "James T. White" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> Subject: Re: Doppler Radar Date: Sat, 7 Jan 2006 18:51:19 -0600 Message-ID: <43c06074$0$502$a726171b@news.hal-pc.org> "RST Engineering" wrote in message news:cc92e$43c05752$4251359f$3875@DIALUPUSA.NET... > B) It is a private dead-end road owned in mutual easement between the four > families that live at the end of it about half a mile off the county road > that serves it. The county mounties have nothing to say about what goes on > on the road. So go have a talk with the parents in the other three families and ask them to get control of their kids. Better yet, send the responsible ones a bill for your new dog. -- James T. White Article: 95940 of rec.radio.amateur.homebrew Subject: NE602 replacement is NTE7164? From: JE Message-ID: <22a47$43c06c9c$d135c4af$28527@MDI.CA> Date: Sat, 07 Jan 2006 20:36:28 -0500 Anyone know if these NTE7164 is a drop in replacement for NE602? What are other current IC's being used for mixers by homebrewers? JE Article: 95941 of rec.radio.amateur.homebrew From: "Samuel Hunt" Subject: Re: PIC Based Freq Readout Date: Sun, 8 Jan 2006 02:19:44 +0000 (UTC) Message-ID: References: What frequency do you want it to count up to and what accuracy? Sam "Howard" wrote in message news:OvXvf.13125$W4.3549@newsfe4-gui.ntli.net... > Does anyone have circuit and software listing for PIC based freq readout, > preferably with IF offset. 16F84 would be ideal. I've tried to contact > IK3OIL for the software for his counter but am unable to. > Thanks. Howard G3UPZ > Article: 95942 of rec.radio.amateur.homebrew From: "RST Engineering" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <43C019C6.1090301@invalid.invalid> <525cb$43c01ac5$4251d54c$723@DIALUPUSA.NET> Subject: Re: Doppler Radar Date: Sat, 7 Jan 2006 18:25:20 -0800 Message-ID: <268bb$43c0784d$42512485$4526@DIALUPUSA.NET> What a fu**ing jerk. I asked a technical question in a technical newsgroup. I expect a technical answer. As to your political and ethical questions to my question, go find another newsgroup to tell others how to live. Our little tiny community knows how to do it, we all agree on the problem, and we're going to solve it. I'm providing the technical know-how. And don't tell me how to use local law enforcement or local political action how to do it. I've spent 12 years of my life in local elective office at the highest local levels. I don't need your unsolicited advice on how to work the system. Please, no more of this crap. Anybody with a source for doppler radars, please post. Others, BUTT OUT. Jim "Brian" wrote in message news:eCYvf.31091$q4.20536@newsfe2-gui.ntli.net... > RESPONSIBLE parents do not let their children run out in the road, idiots > that allow dogs to run free in the road need to be aware that they can > cause accidents. Article: 95943 of rec.radio.amateur.homebrew From: "RST Engineering" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <43C019C6.1090301@invalid.invalid> <525cb$43c01ac5$4251d54c$723@DIALUPUSA.NET> Subject: Re: Doppler Radar Date: Sat, 7 Jan 2006 18:26:26 -0800 Message-ID: What a fu**ing jerk. I asked a technical question in a technical newsgroup. I expect a technical answer. As to your political and ethical questions to my question, go find another newsgroup to tell others how to live. Our little tiny community knows how to do it, we all agree on the problem, and we're going to solve it. I'm providing the technical know-how. And don't tell me how to use local law enforcement or local political action how to do it. I've spent 12 years of my life in local elective office at the highest local levels. I don't need your unsolicited advice on how to work the system. Please, no more of this crap. Anybody with a source for doppler radars, please post. Others, BUTT OUT. Jim "Brian" wrote in message news:eCYvf.31091$q4.20536@newsfe2-gui.ntli.net... > RESPONSIBLE parents do not let their children run out in the road, idiots > that allow dogs to run free in the road need to be aware that they can > cause accidents. Article: 95944 of rec.radio.amateur.homebrew From: "RST Engineering \(jw\)" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <43c06074$0$502$a726171b@news.hal-pc.org> Subject: Re: Doppler Radar Date: Sat, 7 Jan 2006 18:30:06 -0800 Message-ID: You are one of the idiots I don't ever want to live next to. We can talk to the parents until we are blue in the face and the kids are going to be ... kids. Please butt out of this conversation. Ji "James T. White" wrote in message news:43c06074$0$502$a726171b@news.hal-pc.org... > So go have a talk with the parents in the other three families and ask > them to get control of their kids. Better yet, send the responsible > ones a bill for your new dog. > > -- > James T. White > > Article: 95945 of rec.radio.amateur.homebrew From: "RST Engineering \(jw\)" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <43C019C6.1090301@invalid.invalid> <525cb$43c01ac5$4251d54c$723@DIALUPUSA.NET> Subject: Re: Doppler Radar Date: Sat, 7 Jan 2006 18:33:44 -0800 Message-ID: That's because "Brian", an "experienced investigator" hasn't ever seen ALB, although laymen such as I can translate it rather easily. Brian is a jerknose. Jim .com Article: 95946 of rec.radio.amateur.homebrew From: "xpyttl" References: Subject: Re: PIC Based Freq Readout Message-ID: <4n%vf.77$QZ5.72@fe07.lga> Date: Sat, 7 Jan 2006 22:07:56 -0500 Google Francesco ... I'm pretty sure he has that code on his website still. There must be a hundred variants, all pretty much the same. Weeder is another popular one. I personally like the OM3CPH version. I can probably email you a half-dozen. Most of the 16F84 ones are pretty bad from a code point, making it hard to incorporate your IF, but they all pretty much work. Unless you have a basketfull of F84's laying around, almost any other part is a better choice. A lot of people use the 628 these days, which is about twice an F84 at a third the price. It usually isn't real tough to make the code changes. (A lot of F84 code, though, it so bad it is hard to make any changes). If the email on your posting is correct, I'll email you a few. .. "Howard" wrote in message news:OvXvf.13125$W4.3549@newsfe4-gui.ntli.net... > Does anyone have circuit and software listing for PIC based freq readout, > preferably with IF offset. 16F84 would be ideal. I've tried to contact > IK3OIL for the software for his counter but am unable to. > Thanks. Howard G3UPZ > Article: 95947 of rec.radio.amateur.homebrew From: "xpyttl" References: <22a47$43c06c9c$d135c4af$28527@MDI.CA> Subject: Re: NE602 replacement is NTE7164? Message-ID: Date: Sat, 7 Jan 2006 22:10:39 -0500 NE602, NE612, SA602, SA612 all virtually identical. NE/SA are different manufacturers, 602/612 are different test specs. Generally the 612s are a little cheaper. Same basic specs just tested less extensively. .. "JE" wrote in message news:22a47$43c06c9c$d135c4af$28527@MDI.CA... > Anyone know if these NTE7164 is a drop in replacement for NE602? > What are other current IC's being used for mixers by homebrewers? > > JE Article: 95948 of rec.radio.amateur.homebrew Message-ID: <43C09747.E3D13E02@earthlink.net> From: "Michael A. Terrell" Subject: Re: NE602 replacement is NTE7164? References: <22a47$43c06c9c$d135c4af$28527@MDI.CA> Date: Sun, 08 Jan 2006 04:38:47 GMT JE wrote: > > Anyone know if these NTE7164 is a drop in replacement for NE602? > What are other current IC's being used for mixers by homebrewers? > > JE Go to http://nte01.nteinc.com/webforms.nsf/qcsignin?openform to download their semicondutor cross reference. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida Article: 95949 of rec.radio.amateur.homebrew From: "Jimbo" References: <1136619271.789630.294240@z14g2000cwz.googlegroups.com> <1136622897.249261.173890@z14g2000cwz.googlegroups.com> <3a5vr1h0lrbu5oj938epahm7io3sv6goj7@4ax.com> <1136629453.806105.123170@g49g2000cwa.googlegroups.com> <1136632427.095694.9450@g44g2000cwa.googlegroups.com> Subject: Re: More Markie Mularkie: Attn: Walt Message-ID: Date: Sun, 08 Jan 2006 09:03:29 GMT > Walt, Meet Mark "Markie" Morgan, wonder if he is related to our Markie twins ?? ..... Article: 95950 of rec.radio.amateur.homebrew From: Frank Turner-Smith G3VKI Subject: Re: More Markie Mularkie: Attn: Walt References: <1136619271.789630.294240@z14g2000cwz.googlegroups.com> <1136622897.249261.173890@z14g2000cwz.googlegroups.com> <3a5vr1h0lrbu5oj938epahm7io3sv6goj7@4ax.com> <1136629453.806105.123170@g49g2000cwa.googlegroups.com> <1136632427.095694.9450@g44g2000cwa.googlegroups.com> Message-ID: Date: Sun, 08 Jan 2006 09:18:05 GMT on 07/01/2006 11:13 K4YZ said the following: > an_old_friend wrote: > >>Walt Davidson wrote: >> >>>On 7 Jan 2006 01:01:15 -0800, "an old friend" >>>wrote: >>> >>> >>>>cuting the reption of hate filled #### >>> >>>How on earth does a person "cute reption"? >> >>by doing so > > > Walt, Meet Mark "Markie" Morgan, KB9RQZ. Markie is a functionally > illiterate, socially inept, welfare dependent, sexually deviant > alcoholic miscreant of American society. > > Markie claims to have an IQ of 248. For reasons I am sure you can > see, we seriously doubt his honesty (although he gives us dozen of > other reasons to do that). > > Markie has in the past tried to regale us with his alleged skill > and knowledge of all-things-computing, but can't seem to get a spell > checker to work. > > Go figure. > > His latest demonstration of skill is to bomb the NG with over 700 > posts in an attempt to harrass me. All it's done is solidify everyone > else's opinion on his mental instability. Witness his taglines that > have my home address but someone else's phone number. (Oh, by the > way...Markie likes to make up screen names of dead children and use > them in order to circumvent Google posting limits...) > > So...there you go. On behalf of American Amateurs everywhere, I > extend my apologies to those of you "across the pond" who ahve to see > this creep's foul mouth and childish rantings in this forum. > > 73 > > Steve, K4YZ > Sounds like he should meet Beanie, they have a lot in common. Maybe they'd get a room somewhere. -- ;-) 73 de Frank Turner-Smith G3VKI - mine's a pint. http://turner-smith.co.uk Article: 95951 of rec.radio.amateur.homebrew From: "Paul VK3DIP" References: Subject: Re: Identifying a mystery diode Message-ID: <%Y5wf.211066$V7.184872@news-server.bigpond.net.au> Date: Sun, 08 Jan 2006 10:38:51 GMT John, Thanks for the suggestion, I've got a thousand of the things so I have no problems testing one or two to destruction. However it might take a little while to rig up a power supply etc., I will give it a go and get back to the group. No there are no markings at all, not even an indication of a band or dot to mark the cathode. I too thought they looked like a rf package which is why I bought them. Paul. "John A" wrote in message news:dpj2vc$i4p$1@newsg3.svr.pol.co.uk... > Hi Paul, > > That sort of "mini-L" packaging is often used for vhf components, e.g. > tuning diodes, hot carrier diodes and PIN diodes - and some of these have > forward volt-drops of more than one volt. > > You can investigate that suggestion that it is a high-voltage rectifier by > applying, say, 200v reverse voltage via a 1Mohm resistor and measuring the > breakdown (if any) voltage of the diode, or what current flows. Any of the > other suggestions - including mine - will break down. > > Are there definitely no markings? > > > John A > "Paul VK3DIP" wrote in message > news:cXjtf.136133$V7.93540@news-server.bigpond.net.au... >> Hi all I recently purchased a bag of unmarked supposedly diodes and I am >> trying to figure out what they are. The clues so far are normal diode >> action on a multimeter (ie conducts one way but not the other) but the >> forward voltage is high at about 1.4 - 1.5 volts. The packaging is a > small >> square black plastic box with flat axial leads one of which has a small >> cross >> piece on it. This packaging suggests small signal or at least low power. >> >> If anyone wants to look at the mystery diode it is the top one >> in this picture. >> http://www.users.bigpond.com/pmcmahon/mysterydiode.jpg >> The bottom one is a normal glass 1N914 just for scale. >> >> There is nowhere for the light to come out (or in) so they are not LEDs >> which is the only other diode like component I have come across with that >> high a forward voltage. Could it be two silicon diodes in series? >> >> Any suggestions or even just identifying the case outline would be >> appreciated. >> >> Thanks >> Paul VK3DIP >> >> >> > > Article: 95952 of rec.radio.amateur.homebrew From: "Gary Smith" Subject: Dick Smith Radio Direction Finder Date: Sun, 8 Jan 2006 23:56:31 +1100 Message-ID: Hi, i have aquired an old Dick Smith Radio Direction Finder unit but there is no ASU (Antenna Switching Unit) or antennas with it. I would like to know if someone might have information on how to build the antennas and ASU and any more information on the kit itself. Thanks Gary Article: 95953 of rec.radio.amateur.homebrew Date: Mon, 09 Jan 2006 00:28:25 +1100 From: Simon Templar Subject: Re: Dick Smith Radio Direction Finder References: Message-ID: <43c11379$1_2@news.melbourne.pipenetworks.com> Gary Smith wrote: > Hi, i have aquired an old Dick Smith Radio Direction Finder unit but there > is no ASU (Antenna Switching Unit) or antennas with it. I would like to know > if someone might have information on how to build the antennas and ASU and > any more information on the kit itself. > > Thanks > > Gary Could you have found any more newsgroups to cross-post to? -- 73 de Simon, VK3XEM. Article: 95954 of rec.radio.amateur.homebrew From: "John A" Subject: Re: Identifying a mystery diode Date: Sun, 8 Jan 2006 13:59:45 -0000 Message-ID: References: <%Y5wf.211066$V7.184872@news-server.bigpond.net.au> There should be no destruction - the 1Mohm resistor will see to that. John "Paul VK3DIP" wrote in message news:%Y5wf.211066$V7.184872@news-server.bigpond.net.au... > John, > Thanks for the suggestion, I've got a thousand of the things so I have no > problems testing one or two to destruction. However it might take a little > while to rig up a power supply etc., I will give it a go and get back to the > group. No there are no markings at all, not even an indication of a band or > dot to mark the cathode. I too thought they looked like a rf package which > is why I bought them. > > Paul. Article: 95955 of rec.radio.amateur.homebrew From: microwaves@blueyonder.co.uk (Peter) Subject: Re: More Markie Mularkie: Attn: Walt Message-ID: <43c11fa2.266961089@news.blueyonder.co.uk> References: <1136619271.789630.294240@z14g2000cwz.googlegroups.com> <1136622897.249261.173890@z14g2000cwz.googlegroups.com> <3a5vr1h0lrbu5oj938epahm7io3sv6goj7@4ax.com> <1136629453.806105.123170@g49g2000cwa.googlegroups.com> <1136632427.095694.9450@g44g2000cwa.googlegroups.com> Date: Sun, 08 Jan 2006 14:21:44 GMT On 7 Jan 2006 03:13:47 -0800, "K4YZ" wrote: > So...there you go. On behalf of American Amateurs everywhere, I >extend my apologies to those of you "across the pond" who ahve to see >this creep's foul mouth and childish rantings in this forum. > >73 > >Steve, K4YZ No need to apologise Steve ... we have similar versions of the creep over here in the UK! HNY and 73 from Peter, G3PHO Article: 95956 of rec.radio.amateur.homebrew Message-ID: <43C124D6.3080004@nospam.com> From: Fred Bloggs Subject: Re: Doppler Radar References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <23e07$43c044e8$4251d54c$3390@DIALUPUSA.NET> Date: Sun, 08 Jan 2006 14:42:32 GMT Wes Stewart wrote: > > 28-628. Rights of real property owners > > This chapter does not prevent the owner of real property that is used > by the public for purposes of vehicular travel by permission of the > owner and not as a matter of right from: > > 1. Prohibiting that use. > > 2. Requiring other, different or additional conditions than those > specified in this chapter. > > 3. Otherwise regulating the use as deemed best by the owner. > > In other words, I get to regulate the speed (I've posted it as 10 > MPH). I have no power to fine UPS, but I can still cost them money. You are not reading the wording carefully; it is the "not as a matter of right from" that you are missing. It very well may be a matter of right if the private road is co-owned by the other property holders and this ownership allows them the right to transact business in the way of receiving deliveries as they choose. Article: 95957 of rec.radio.amateur.homebrew From: "Jeff" Subject: Re: SPRAT #125 - The Saviour of Ham Radio? Date: Sun, 8 Jan 2006 14:44:48 -0000 Message-ID: References: <1136634900.634706.200590@z14g2000cwz.googlegroups.com> > One point of criticism, to keep a balance, is that the G-QRP > club supports the gangrenous degeneration that is the M3/CB > Fools' Licence scheme and by publishing a homebrew Top > Band rig by a licensee in the aforementioned scheme is encouraging > the licensees thereof to breach their licence conditions. Been upstaged by an M3? Instead of whinging on the NG why don't you write an article for the G-QRP Club Mag and share your knowledge with those who you would no doubt class as _REAL_ Radio Hams? Article: 95958 of rec.radio.amateur.homebrew From: Jim Thompson Subject: Re: Doppler Radar Message-ID: References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <23e07$43c044e8$4251d54c$3390@DIALUPUSA.NET> Date: Sun, 08 Jan 2006 07:54:49 -0700 On Sun, 08 Jan 2006 07:35:15 -0700, Wes Stewart wrote: >On Sat, 7 Jan 2006 14:47:08 -0800, "RST Engineering" > wrote: > >>What illegal? I can either retune it for a ham band or reduce power if >>necessary. I'll find the hardware first and figure out the legal later. > >Well, I know I'm going to be asked to leave this discussion but, >technically, unless you are IDing with your call sign every 10 >minutes. it would be illegal. I seriously doubt that this was in your >plan. > >Police radar guns, should you come up with one, are also licensed to >the department, assuming the cops are following the law, always a >dubious proposition. > >So, because these are -technical- newsgroups, I was being -technical-. > >Now for a "prohibited" non-technical suggestion, here is one that I am >contemplating. I too live on a short, private, single-lane road, that >serves four multi-acre homesites. I am plagued by the guys driving >delivery trucks (DHL, UPS, etc) who roar down the road in a cloud of >dust while delivering to my neighbors. I have complained to UPS >repeatedly without success. > >So one of these days, when I'm up to it, after they go by on the way >to the neighbor's house, I'm going to take my truck out and block the >road for 15 minutes. (A second offense will call for a penalty of 30 >minutes, etc) UPS seems to have a deal with law enforcement that >exempts them from speed limits on public roads, but in AZ the statutes >say: > > 28-628. Rights of real property owners > >This chapter does not prevent the owner of real property that is used >by the public for purposes of vehicular travel by permission of the >owner and not as a matter of right from: > >1. Prohibiting that use. > >2. Requiring other, different or additional conditions than those >specified in this chapter. > >3. Otherwise regulating the use as deemed best by the owner. > >In other words, I get to regulate the speed (I've posted it as 10 >MPH). I have no power to fine UPS, but I can still cost them money. You're probably going to get into "co-ownership" issues regarding the access easement. How is the road ownership defined... everyone grant an easement to the others? A neighbor may sue you for "interference" in his business. Where in AZ are you? ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. Article: 95959 of rec.radio.amateur.homebrew Message-ID: <43C12CE3.9040904@nospam.com> From: Fred Bloggs Subject: Re: Doppler Radar References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> Date: Sun, 08 Jan 2006 15:16:54 GMT > Back in the '60s and early '70s I did some work with Impatt and Gunn diodes, > building a little self-detecting doppler for speed sensing. However, 35 > years have passed and my notebooks for that stuff are somewhere in a dusty > archive along with my venerable sliderule. > > Is there a cheap source for onesies-twosies of a radar front-end that will > give me doppler audio as a function of a large metal object's speed at a > range of 20 meters or so? I don't need to go into production on this thing, > just build one. A surplus source would be ideal. > > It seems that the little kids on our rural country lane have all become > teenagers at once and are trying to outdo the others in how fast they can > drive daddy's car up and down the lane. We've lost one dog this week and > unless I can put up some sort of a siren that goes off when they exceed some > agreed upon limit, the carnage will continue. > You should just lay down some pressure switch hose and get a Parallax BASIC STAMP kit from Radio Shack. Parallax has wireless modules on their site you can order to xmit the data to your house for timestamping, archiving via a PC etc...The smarts will run off a 9V for months- you can't say that about a Gunn osc xmtr or any of the other surplus junk. And then there is the issue of weather-proofing and possible loss due to vandalism- think hidden wireless camera activated by intrusion alarm in PIC. Article: 95960 of rec.radio.amateur.homebrew From: Bill Janssen Subject: Re: Doppler Radar References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <23e07$43c044e8$4251d54c$3390@DIALUPUSA.NET> Message-ID: <6_awf.144$wk5.125@news02.roc.ny> Date: Sun, 08 Jan 2006 16:21:22 GMT This is a multi-part message in MIME format. --------------050106030701000807060002 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Wes Stewart wrote: >On Sat, 7 Jan 2006 14:47:08 -0800, "RST Engineering" > wrote: > > > >>What illegal? I can either retune it for a ham band or reduce power if >>necessary. I'll find the hardware first and figure out the legal later. >> >> > >Well, I know I'm going to be asked to leave this discussion but, >technically, unless you are IDing with your call sign every 10 >minutes. it would be illegal. I seriously doubt that this was in your >plan. > >Police radar guns, should you come up with one, are also licensed to >the department, assuming the cops are following the law, always a >dubious proposition. > > > There is a frequency near 10.5 GHz assigned for unlicensed door openers etc. I have a few of the Gunn units that came from door openers. Bill K7NOM some stuff snipped --------------050106030701000807060002 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Wes Stewart wrote: 
On Sat, 7 Jan 2006 14:47:08 -0800, "RST Engineering"
<jim@rstengineering.com> wrote:

  
What illegal?  I can either retune it for a ham band or reduce power if 
necessary.  I'll find the hardware first and figure out the legal later.
    

Well, I know I'm going to be asked to leave this discussion but,
technically, unless you are IDing with your call sign every 10
minutes. it would be illegal. I seriously doubt that this was in your
plan.

Police radar guns, should you come up with one, are also licensed to
the department, assuming the cops are following the law, always a
dubious proposition.
There is a frequency near 10.5 GHz assigned for unlicensed door openers etc.
I have a few of the Gunn units that came from door openers.

Bill K7NOM

some stuff snipped
--------------050106030701000807060002-- Article: 95961 of rec.radio.amateur.homebrew From: "RST Engineering" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <23e07$43c044e8$4251d54c$3390@DIALUPUSA.NET> Subject: Re: Doppler Radar Date: Sun, 8 Jan 2006 09:34:41 -0800 Message-ID: <93e6f$43c14d2b$42512a6a$16866@DIALUPUSA.NET> Precisely the plan, Wes. The horn serves two purposes. One, it alerts the transgressor that they pushed the button. Two, it alerts me to fire up the truck and block the road. As others have pointed out, a two pressure hose setup and some simple math in a microprocessor of some sort would serve the same purpose at far less current draw, but I'd like to try the radar gun first. Hell, Jim Thompson went on for two weeks about how to detect a school bus pulling up in front of the house. I thought this one would go on for at LEAST as long {;-) BTW, Jim, what was your ultimate solution to that problem? Jim > Now for a "prohibited" non-technical suggestion, here is one that I am > contemplating. I too live on a short, private, single-lane road, that > serves four multi-acre homesites. I am plagued by the guys driving > delivery trucks (DHL, UPS, etc) who roar down the road in a cloud of > dust while delivering to my neighbors. I have complained to UPS > repeatedly without success. > > So one of these days, when I'm up to it, after they go by on the way > to the neighbor's house, I'm going to take my truck out and block the > road for 15 minutes. (A second offense will call for a penalty of 30 > minutes, etc) UPS seems to have a deal with law enforcement that > exempts them from speed limits on public roads, but in AZ the statutes > say: Article: 95962 of rec.radio.amateur.homebrew From: "Frank Bemelman" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <23e07$43c044e8$4251d54c$3390@DIALUPUSA.NET> <93e6f$43c14d2b$42512a6a$16866@DIALUPUSA.NET> Subject: Re: Doppler Radar Date: Sun, 8 Jan 2006 18:42:52 +0100 Message-ID: <43c14eeb$0$10826$e4fe514c@dreader17.news.xs4all.nl> "RST Engineering" schreef in bericht > > BTW, Jim, what was your ultimate solution to that problem? No solution at all, I'd guess. JT is full of shit, being the miserable piece of shit that he is. -- Thanks, Frank. (remove 'q' and '.invalid' when replying by email) Article: 95963 of rec.radio.amateur.homebrew From: Ken Scharf Subject: Re: 1N4007 varactors References: Message-ID: Date: Sun, 08 Jan 2006 13:54:38 -0500 JE wrote: > The common 1N4007 seem to work for HF but what is the max. frequency they > can be used as varactors? > > And how about zener diodes? > > JE I suspect any si diode will work to some extent as a varicap or zener. Not all diodes will be stable as zeners, the 1N506x series will probably work better as a zeners than the 1n400x series. BTW the 1n5061 will work as an 850v zener! Also the 1n4007 makes a good poor man's PIN diode for switching rf. Article: 95964 of rec.radio.amateur.homebrew From: Ken Scharf Subject: Re: FA:MORE AIR VARIABLES + STUFF References: Message-ID: <_edwf.20957$0y2.17641@bignews2.bellsouth.net> Date: Sun, 08 Jan 2006 13:58:38 -0500 Heytubeguy wrote: > I will be listing ~35-45 air variables in the next month in addition to = > ones already listed on Ebay. So, pse check back frequently. Trying to = > clean out stuff. Some new ones are listed now and the mostly used ones = > (receive & transmit) will be added a few each day or every other day. = > Tnx for stopping by: > > http://search.ebay.com/_W0QQfgtpZ1QQfrppZ25QQsassZheytubeguy > > 73 Joe, heytubeguy > > Wow, I didn't know national made that weird 270 degree type cap in anything that large (1100pf)! I have one that goes to 140pf (used in the Regenerative Receiver from the 1950's Boy Electrician). Article: 95965 of rec.radio.amateur.homebrew From: Ken Scharf Subject: Re: Building a "Robinson Crusoe" Battery References: <1136229191.768561.62190@g49g2000cwa.googlegroups.com> Message-ID: Date: Sun, 08 Jan 2006 14:01:42 -0500 Too_Many_Tools wrote: > Reading the thread on the Voltaic pile in sci.chem.electrochem.battery, > I started considering what would one have to do to build a "Robinson > Crusoe" battery to power equipment in an emergency. > > Assuming a battery of 12v and respectable current to power > communications equipment, how would you do it? > > What materials would you use? > > How would you charge it? > > I look forward to your contributions. > > TMT > Well the history channel just showed a 2000 year old battery found in Bhagdad. It had an iron rod negative pole and a copper cylinder positive pole, and probably used vinegar as the electrolyte. A clay jar housed the unit. What would a battery be used for 2000 years ago? BION, electroplating gold! Article: 95966 of rec.radio.amateur.homebrew From: Jim Thompson Subject: Re: Doppler Radar Message-ID: References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <23e07$43c044e8$4251d54c$3390@DIALUPUSA.NET> <93e6f$43c14d2b$42512a6a$16866@DIALUPUSA.NET> Date: Sun, 08 Jan 2006 12:25:49 -0700 On Sun, 8 Jan 2006 09:34:41 -0800, "RST Engineering" wrote: >Precisely the plan, Wes. The horn serves two purposes. One, it alerts the >transgressor that they pushed the button. Two, it alerts me to fire up the >truck and block the road. > >As others have pointed out, a two pressure hose setup and some simple math >in a microprocessor of some sort would serve the same purpose at far less >current draw, but I'd like to try the radar gun first. > >Hell, Jim Thompson went on for two weeks about how to detect a school bus >pulling up in front of the house. I thought this one would go on for at >LEAST as long {;-) > >BTW, Jim, what was your ultimate solution to that problem? > >Jim > [snip] Sit in my office from 7:45-8:00AM, so I'm looking out the window ;-) What I am going to try, when I have the time, is a suggestion that colored LED's make color-sensitive detectors. ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. Article: 95967 of rec.radio.amateur.homebrew From: "JoeSP" References: <1136229191.768561.62190@g49g2000cwa.googlegroups.com> <4de328dd98dave@davenoise.co.uk> <1136248266.774928.135230@o13g2000cwo.googlegroups.com> Subject: Re: Building a "Robinson Crusoe" Battery Message-ID: Date: Sun, 08 Jan 2006 20:09:08 GMT wrote in message news:1136248266.774928.135230@o13g2000cwo.googlegroups.com... > Dave Plowman (News) wrote: >> In article , >> philo wrote: >> > a "Robinson Crusoe" battery must be one you'd make if stranded on an >> > island... so you'd have plenty of sea water. you could use electrodes >> > of >> > copper and zinc >> >> Plenty of that on the average desert island...;-) > > I've been wondering that too. I'd likely pick salt water electrolyte > and carbon and steel electrodes. Assuming there is no ready metal on > the island, hopefully there would be a zip on some clothing, a button > or something. Burnt vegetation could provide the carbon. > > I found a little 1" or so bottletop sized cell gave in the region of > half an amp at 1v. The electrodes corrode quickly, in a day. What's the point? You can make a battery out of many, many substances, but only a few of them are economical, practical or useful. Article: 95968 of rec.radio.amateur.homebrew From: Allison-nospam@nouce.bellatlantic.net Subject: Re: 1N4007 varactors Message-ID: References: Date: Sun, 08 Jan 2006 21:45:11 GMT On Sat, 07 Jan 2006 17:26:23 -0500, JE wrote: >The common 1N4007 seem to work for HF but what is the max. frequency they >can be used as varactors? I've used them at low VHF, the limiting factor there is minimum capacitance my be too high for some VHF uses. >And how about zener diodes? As varicaps? Some are ok some very poor. You require a breakdown voltage well above the applied bias. Allison Article: 95969 of rec.radio.amateur.homebrew From: Joerg Subject: Re: Doppler Radar References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> Message-ID: Date: Sun, 08 Jan 2006 22:09:44 GMT Hello Jim, Since you said this is a road with very little traffic can't you just rig up two IR sensing paths? Like on garage doors? It's unlikely that there'd be two cars passing each other in opposite direction. Then all you'd need would be a ramp generator that gets started by whichever IR sensor goes first. It is reset by the other sensor. If the reset occurs and the ramp voltage didn't reach a set threshold that means whatever triggered it was going to fast. Regards, Joerg http://www.analogconsultants.com Article: 95970 of rec.radio.amateur.homebrew From: "Mike Andrews" Subject: Re: Identifying a mystery diode Date: Sun, 8 Jan 2006 22:15:44 +0000 (UTC) Message-ID: References: <%Y5wf.211066$V7.184872@news-server.bigpond.net.au> Paul VK3DIP wrote: > John, > Thanks for the suggestion, I've got a thousand of the things so I have no > problems testing one or two to destruction. However it might take a little > while to rig up a power supply etc., I will give it a go and get back to the > group. No there are no markings at all, not even an indication of a band or > dot to mark the cathode. I too thought they looked like a rf package which > is why I bought them. I think that the crossbar on the lead marks the cathode. I could be wrong, of course, in which case it marks the anode. -- Mike Andrews, W5EGO mikea@mikea.ath.cx Tired old sysadmin Article: 95971 of rec.radio.amateur.homebrew From: ehramm@dk3uz.ampr.org (Edmund H. Ramm) Subject: Re: SPRAT #125 - The Saviour of Ham Radio? References: <1136634900.634706.200590@z14g2000cwz.googlegroups.com> Message-ID: Date: Sun, 8 Jan 2006 22:51:52 GMT In <1136634900.634706.200590@z14g2000cwz.googlegroups.com> "Orator For Decency" writes: > [...] > One point of criticism, to keep a balance, is that the G-QRP > club supports the gangrenous degeneration that is the M3/CB > Fools' Licence scheme > [...] Well, in today's 80m AFS I worked, among many others, one 2E and one M3, both very good ops. Heard no G{1|6|8}+3, though. 73, Eddi ._._. -- e-mail: dk3uz AT darc DOT de | AMPRNET: dk3uz@db0hht.ampr.org If replying to a Usenet article, please use above e-mail address. Linux/m68k, the best U**x ever to hit an Atari! Article: 95972 of rec.radio.amateur.homebrew From: Al Klein Subject: Re: Dick Smith Radio Direction Finder Message-ID: References: Date: Sun, 08 Jan 2006 18:03:41 -0500 On Sun, 8 Jan 2006 23:56:31 +1100, "Gary Smith" wrote: There are probably at least a dozen other RDF designs nased on the same idea floating around on the web. A look at any of them, and a schematic of what you have (draw one if necessary), will tell you how to make what you need. The antennas are usually 1/2 wave dipoles at whatever frequency the unit will be used. Copperweld or wire hangers make decent antennas, although I prefer stainless control wire of the type used on model planes. Article: 95973 of rec.radio.amateur.homebrew From: "Gary Smith" Subject: Re: Dick Smith Radio Direction Finder Date: Mon, 9 Jan 2006 10:32:54 +1100 Message-ID: References: <43c11379$1_2@news.melbourne.pipenetworks.com> Well, i thought if you need information why not get as much as you can in one go? Seems logical to me. And it's not like i'm posting some dribble, bs, flame. I am getting some good replies so far. Gary Article: 95974 of rec.radio.amateur.homebrew From: "Gary Smith" Subject: Re: Dick Smith Radio Direction Finder Date: Mon, 9 Jan 2006 10:34:40 +1100 Message-ID: References: Dave, if i had a manual with info on how to build one i'd be down the electronics shop getting the bits and building one as we speak :> Gary "Dave" wrote in message news:Aq-dnVewhKvCg1zeRVn-jw@crocker.com... > they never came with antennas that i know of, you had to build them > yourself. the plans for the asu including circuit board and parts list > are in the manual, they are simple things that you should be able to find > at any radio parts store... assuming you can find one of those today. Article: 95975 of rec.radio.amateur.homebrew From: "Gary Smith" Subject: Re: Dick Smith Radio Direction Finder Date: Mon, 9 Jan 2006 10:44:30 +1100 Message-ID: References: Thanks Al, but i'm not too good at working out stuff like that, if it's all laid out in kit form i'm ok. and i thought that seeing these things are reasonably critical (antenna units) that if i tried another design i may be waisting my time and parts on something that isn't suited. Thanks for your input. Gary "Al Klein" wrote in message news:a863s15jsisveq0ghaag6ec4fcj7csg3ei@4ax.com... > On Sun, 8 Jan 2006 23:56:31 +1100, "Gary Smith" > wrote: > > There are probably at least a dozen other RDF designs nased on the > same idea floating around on the web. A look at any of them, and a > schematic of what you have (draw one if necessary), will tell you how > to make what you need. > > The antennas are usually 1/2 wave dipoles at whatever frequency the > unit will be used. Copperweld or wire hangers make decent antennas, > although I prefer stainless control wire of the type used on model > planes. Article: 95976 of rec.radio.amateur.homebrew From: "Gary Smith" Subject: Re: Dick Smith Radio Direction Finder Date: Mon, 9 Jan 2006 10:45:22 +1100 Message-ID: References: <43C15BA4.3F39@orcon.net.nz> Glenn that would be great if you could possibly scan the docs and email them, really appreciate that, Thanks. Gary > I've got one - defective - I think I popped the switching diodes by > accidentally transmitting thru it. I know I've got the dox 'somewhere' > - just gotta dig 'em out. > > From memory, the four pin cable from the main unit sends a rotating DC > bias to each of the switching diodes in the box. There's a diode at the > antenna base too, by design. I haven't opened the box yet, but the > diode at the antenna base is ITT BA 282 Cathode (bar) to coax > shield. > > If/when I find the dox, I'll get back to you. Let me know how you > progress. > > Glenn ZL2TLD Article: 95977 of rec.radio.amateur.homebrew From: " Uncle Peter" References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> <1136770300.583119.201460@g43g2000cwa.googlegroups.com> Subject: Re: What Does Your Electronics Workshop Look Like? Message-ID: <8skwf.41619$Mi5.38422@dukeread07> Date: Sun, 8 Jan 2006 22:07:13 -0500 http://radioatticarchives.com/features/fun/bertini.jpg Rotary parts storage bin in corner. Tools are in the black tool chest. BTW, the test gear has doubled since this photo was taken. Pete k1zjh Article: 95978 of rec.radio.amateur.homebrew From: "James T. White" References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> <1136770300.583119.201460@g43g2000cwa.googlegroups.com> <8skwf.41619$Mi5.38422@dukeread07> Subject: Re: What Does Your Electronics Workshop Look Like? Date: Sun, 8 Jan 2006 21:51:20 -0600 Message-ID: <43c1dc1f$0$504$a726171b@news.hal-pc.org> " Uncle Peter" wrote in message news:8skwf.41619$Mi5.38422@dukeread07... > http://radioatticarchives.com/features/fun/bertini.jpg > > Rotary parts storage bin in corner. Tools are in the black tool chest. BTW, > the test gear > has doubled since this photo was taken. > Pete, Hopefully you added some additional vertical support on those long shelves.... -- James T. White Article: 95979 of rec.radio.amateur.homebrew Subject: Re: 1N4007 varactors From: JE References: Message-ID: Date: Sun, 08 Jan 2006 22:56:21 -0500 Maybe 2N4401 will work, I built some simple 1 transistor FM transmitters that modulate the base. If not, who sells dual varactors in small quantities? JE > On Sat, 07 Jan 2006 17:26:23 -0500, JE wrote: > >>The common 1N4007 seem to work for HF but what is the max. frequency >>they can be used as varactors? > > I've used them at low VHF, the limiting factor there is minimum > capacitance my be too high for some VHF uses. > >>And how about zener diodes? > > As varicaps? Some are ok some very poor. You require a breakdown > voltage well above the applied bias. > > Allison > Article: 95980 of rec.radio.amateur.homebrew From: "RST Engineering" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> Subject: Re: Doppler Radar Date: Sun, 8 Jan 2006 20:00:17 -0800 Message-ID: Good idea, Joerg. Where do I get onesie-twosie IR sensors that will trigger at 3 meters or better? Jim "Joerg" wrote in message news:I4gwf.55708$q%.46987@newssvr12.news.prodigy.com... > Hello Jim, > > Since you said this is a road with very little traffic can't you just rig > up two IR sensing paths? Article: 95981 of rec.radio.amateur.homebrew From: "James T. White" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <43c06074$0$502$a726171b@news.hal-pc.org> Subject: Re: Doppler Radar Date: Sun, 8 Jan 2006 22:01:54 -0600 Message-ID: <43c1de9a$0$506$a726171b@news.hal-pc.org> "RST Engineering (jw)" wrote in message news:ebb$43c07929$42512485$4540@DIALUPUSA.NET... > You are one of the idiots I don't ever want to live next to. We can talk to > the parents until we are blue in the face and the kids are going to be ... > kids. > > Please butt out of this conversation. > > Ji > Jim, What makes you think the kids won't drive as fast as they can just to set off your new speed activated siren and piss you off? -- James T. White Article: 95982 of rec.radio.amateur.homebrew From: "RST Engineering" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <23e07$43c044e8$4251d54c$3390@DIALUPUSA.NET> <43C124D6.3080004@nospam.com> Subject: Re: Doppler Radar Date: Sun, 8 Jan 2006 20:06:47 -0800 Message-ID: <4c099$43c1e159$42513109$23598@DIALUPUSA.NET> Wes... I'm not a lawyer, nor do I play one on newsgroups. However, having spent a dozen years in the highest public office in this county and sorting this sort of crap out week after week, you have ABSOLUTE control over the easement. You cannot PROHIBIT transit over the easement, but you can establish "reasonable" controls over passage. A locked gate with "reasonable" access to the keys is OK. A chain that you have to get out of your vehicle to unlock is reasonable. Ten gates with keys may be reasonable or unreasonable, depending on your county judge. Best wishes, and thanks for your help. Jim > What you're trying to tell me is that I've given up complete control > of an easement Article: 95983 of rec.radio.amateur.homebrew From: "RST Engineering" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <23e07$43c044e8$4251d54c$3390@DIALUPUSA.NET> <43C124D6.3080004@nospam.com> <43c1d7fb$0$501$a726171b@news.hal-pc.org> Subject: Re: Doppler Radar Date: Sun, 8 Jan 2006 20:09:39 -0800 Message-ID: <3602b$43c1e206$42513109$23602@DIALUPUSA.NET> Because road humps expose you to liability for that sort of stuff...like wheel alignments and the like due to the fact that there is no national or regional standard for "road humps". Trust me, I'm in a court case like this right now and nobody can present evidence for the correct design of "road humps". Jim > Since you have to maintain your portion of the easement, why not build > some "road humps" so the delivery trucks have to slow down or risk > having to resort all the parcels in the back? Article: 95984 of rec.radio.amateur.homebrew From: "RST Engineering" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <43c06074$0$502$a726171b@news.hal-pc.org> <43c1de9a$0$506$a726171b@news.hal-pc.org> Subject: Re: Doppler Radar Date: Sun, 8 Jan 2006 20:14:19 -0800 Message-ID: <1bff0$43c1e31d$42513109$23615@DIALUPUSA.NET> Quite frankly, I don't give a hairy rat's ass for your practical or political opinion. ATFQ from a technical point of view or butt out. I can take care of the rest of it myself. Jim "James T. White" wrote in message news:43c1de9a$0$506$a726171b@news.hal-pc.org... > What makes you think the kids won't drive as fast as they can just to > set off your new speed activated siren and piss you off? > > -- > James T. White > > Article: 95985 of rec.radio.amateur.homebrew Subject: LMX2322? From: JJ Message-ID: <5da6a$43c1fbbd$d135c4af$24772@MDI.CA> Date: Mon, 09 Jan 2006 00:59:25 -0500 I can't find the LMX2322 on National Semi site. Can someone tell me a suitable replacement as I just need the 64x prescaler function. Thanks JE Article: 95986 of rec.radio.amateur.homebrew From: "Joel Kolstad" Subject: Compensating frequency response of wideband amplifiers Date: Mon, 9 Jan 2006 01:02:01 -0800 Message-ID: <11s49mnbl1hmg3e@corp.supernews.com> Could someone point me in the direction of how you might go about flattening the frequency response of a wideband amplifier MMIC? I'm looking at something like the Watkin-Johnson ECG003 (http://www.wj.com/pdf/ECG003.pdf) and noticing that the response drops a little over 2dB from 500MHz to 2.5GHz. Assuming that I've got plenty of SNR, component count isn't a big deal, and I don't mind tweaking trimmers, how might I go about flattening that respone to, say, 0.5dB or better across that range? Or is it just not very practical? Thanks, ---Joel Kolstad Article: 95987 of rec.radio.amateur.homebrew From: Jim Thompson Subject: Re: Doppler Radar Message-ID: <4cv4s1h2tusoukac1mq2vea7va0c3aciu3@4ax.com> References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <23e07$43c044e8$4251d54c$3390@DIALUPUSA.NET> <43C124D6.3080004@nospam.com> <43c1d7fb$0$501$a726171b@news.hal-pc.org> <3602b$43c1e206$42513109$23602@DIALUPUSA.NET> Date: Mon, 09 Jan 2006 08:15:59 -0700 On Sun, 8 Jan 2006 20:09:39 -0800, "RST Engineering" wrote: >Because road humps expose you to liability for that sort of stuff...like >wheel alignments and the like due to the fact that there is no national or >regional standard for "road humps". Trust me, I'm in a court case like this >right now and nobody can present evidence for the correct design of "road >humps". > >Jim > > >> Since you have to maintain your portion of the easement, why not build >> some "road humps" so the delivery trucks have to slow down or risk >> having to resort all the parcels in the back? > There are speed bumps all over this valley on CITY-maintained streets, as well as speed bumps in many shopping centers. Since I've not heard of a suit, you might look into Arizona law as to what's legal and extrapolate to your situation. BTW, Scottsdale also uses tight-ass round-abouts to slow traffic... you have to slow or you'll rollover. ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. Article: 95988 of rec.radio.amateur.homebrew From: "Richard Henry" Subject: Re: Doppler Radar Date: Mon, 9 Jan 2006 07:53:36 -0800 Message-ID: <42ff9iF1irg5vU1@individual.net> References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <23e07$43c044e8$4251d54c$3390@DIALUPUSA.NET> <43C124D6.3080004@nospam.com> <43c1d7fb$0$501$a726171b@news.hal-pc.org> <3602b$43c1e206$42513109$23602@DIALUPUSA.NET> <4cv4s1h2tusoukac1mq2vea7va0c3aciu3@4ax.com> "Jim Thompson" wrote in message news:4cv4s1h2tusoukac1mq2vea7va0c3aciu3@4ax.com... > BTW, Scottsdale also uses tight-ass round-abouts to slow traffic... > you have to slow or you'll rollover. Can you give me the address of such an intersection? I'd like to look at some on google maps for background on a local street-improvement project. Article: 95989 of rec.radio.amateur.homebrew From: "Mike Andrews" Subject: Re: Doppler Radar Date: Mon, 9 Jan 2006 16:02:43 +0000 (UTC) Message-ID: References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <23e07$43c044e8$4251d54c$3390@DIALUPUSA.NET> <43C124D6.3080004@nospam.com> <43c1d7fb$0$501$a726171b@news.hal-pc.org> <3602b$43c1e206$42513109$23602@DIALUPUSA.NET> <4cv4s1h2tusoukac1mq2vea7va0c3aciu3@4ax.com> <42ff9iF1irg5vU1@individual.net> In rec.radio.amateur.homebrew Richard Henry wrote: > "Jim Thompson" wrote in > message news:4cv4s1h2tusoukac1mq2vea7va0c3aciu3@4ax.com... >> BTW, Scottsdale also uses tight-ass round-abouts to slow traffic... >> you have to slow or you'll rollover. > Can you give me the address of such an intersection? I'd like to look at > some on google maps for background on a local street-improvement project. Google for "chicane"; that's the generic name for tight wiggle-like features built into roads and streets to force traffic to slow down. -- Mike Andrews, W5EGO mikea@mikea.ath.cx Tired old sysadmin Article: 95990 of rec.radio.amateur.homebrew Date: Mon, 09 Jan 2006 11:48:22 -0500 From: Nightingale Subject: Re: Whatever happened to References: <1136653023.889804.5600@f14g2000cwb.googlegroups.com> Message-ID: <1f46a$43c29363$a6661e10$12080@ALLTEL.NET> yzordderrex@verizon.net wrote: > Circuit Board Specialists out of Pueblo Colorado? > > They supplies pc boards and parts for ARRL handbook projects. > > 73 > Bob > N9NEO > I don't know about Circuit Board Specialists, but doesn't Far Circuits provide this service? -N Article: 95991 of rec.radio.amateur.homebrew From: Jim Thompson Subject: Re: Doppler Radar Message-ID: <1h45s1htokfokma462vsi864j086s3sqnf@4ax.com> References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <23e07$43c044e8$4251d54c$3390@DIALUPUSA.NET> <43C124D6.3080004@nospam.com> <43c1d7fb$0$501$a726171b@news.hal-pc.org> <3602b$43c1e206$42513109$23602@DIALUPUSA.NET> <4cv4s1h2tusoukac1mq2vea7va0c3aciu3@4ax.com> <42ff9iF1irg5vU1@individual.net> Date: Mon, 09 Jan 2006 09:49:51 -0700 On Mon, 9 Jan 2006 07:53:36 -0800, "Richard Henry" wrote: > >"Jim Thompson" wrote in >message news:4cv4s1h2tusoukac1mq2vea7va0c3aciu3@4ax.com... >> BTW, Scottsdale also uses tight-ass round-abouts to slow traffic... >> you have to slow or you'll rollover. > >Can you give me the address of such an intersection? I'd like to look at >some on google maps for background on a local street-improvement project. > Google Earth... Intersection of Cholla St. and 68th St., Scottsdale, AZ 85254 LAT 33.589390° LON -111.935610° There are quite a few of this type in Scottsdale and in Carefree/Cave Creek, AZ. Phoenix tends toward speed bumps, but is also looking into round-abouts. Scroll a few blocks SW from there to the NW corner of Desert Cove and 66th St., and you'll see the acre I lived on from 1969 to 1994. I always referred to the Cholla/68th St. intersection as the "drunk catcher", because there's a dip there as well... rain drain channel ;-) ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. Article: 95992 of rec.radio.amateur.homebrew From: mzenier@eskimo.com (Mark Zenier) Subject: Re: NE602 replacement is NTE7164? Date: Sun, 8 Jan 2006 20:14:08 GMT Message-ID: References: <22a47$43c06c9c$d135c4af$28527@MDI.CA> In article , xpyttl wrote: >"JE" wrote in message >news:22a47$43c06c9c$d135c4af$28527@MDI.CA... >> Anyone know if these NTE7164 is a drop in replacement for NE602? >> What are other current IC's being used for mixers by homebrewers? >NE602, NE612, SA602, SA612 all virtually identical. NE/SA are different >manufacturers, No, NE and SA are both Philips prefixes, but different temperature ratings. NE is the commercial range of 0 to +70 deg C, SA the mil/industrial range of -40 to +85 deg C. >602/612 are different test specs. Generally the 612s are a >little cheaper. Same basic specs just tested less extensively. Mark Zenier mzenier@eskimo.com Googleproofaddress(account:mzenier provider:eskimo domain:com) Article: 95993 of rec.radio.amateur.homebrew From: "Richard Henry" Subject: Re: Doppler Radar Date: Mon, 9 Jan 2006 09:48:28 -0800 Message-ID: <42fm0vF1igcdhU1@individual.net> References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <23e07$43c044e8$4251d54c$3390@DIALUPUSA.NET> <43C124D6.3080004@nospam.com> <43c1d7fb$0$501$a726171b@news.hal-pc.org> <3602b$43c1e206$42513109$23602@DIALUPUSA.NET> <4cv4s1h2tusoukac1mq2vea7va0c3aciu3@4ax.com> <42ff9iF1irg5vU1@individual.net> "Mike Andrews" wrote in message news:dpu1f3$iba$1@puck.litech.org... > In rec.radio.amateur.homebrew Richard Henry wrote: > > > "Jim Thompson" wrote in > > message news:4cv4s1h2tusoukac1mq2vea7va0c3aciu3@4ax.com... > >> BTW, Scottsdale also uses tight-ass round-abouts to slow traffic... > >> you have to slow or you'll rollover. > > > Can you give me the address of such an intersection? I'd like to look at > > some on google maps for background on a local street-improvement project. > > Google for "chicane"; that's the generic name for tight wiggle-like > features built into roads and streets to force traffic to slow down. Our local problem is a street that is normally lightly-travelled, but gets congested during the morning and afternoon because of traffic to/from the high school. The city has proposed widening the whole length (it varies >from 50-year-old twisty 2-lane to modern 6-lane boulevard over the stretch in question) and a local group has proposed traffic circles at 4 critical interrsections. Article: 95994 of rec.radio.amateur.homebrew From: lucifer@eternal-flames.gov Subject: Re: Consti-google-pated? Date: Mon, 9 Jan 2006 19:04:09 +0000 (UTC) Message-ID: <7rc5s1p75c84cdlh0lb20klorlkjeotef9@4ax.com> References: <1136718378.765976.269670@o13g2000cwo.googlegroups.com> On 8 Jan 2006 03:06:18 -0800, "Orator For Decency" wrote: >Multitudinous and profuse apologies for >the repetitive creativity - in a number of posts, >I thought I was dreaming - surely I'd posted >but it didn't appear, so I reposted. Now it appears >that I wasn't dreaming and it was simply that >the consti archive was googlepated It's due to all of the crap you keep posting. HTH Old Nick. Article: 95995 of rec.radio.amateur.homebrew From: "xpyttl" References: <22a47$43c06c9c$d135c4af$28527@MDI.CA> Subject: Re: NE602 replacement is NTE7164? Message-ID: Date: Mon, 9 Jan 2006 15:26:15 -0500 "Mark Zenier" wrote in message news:dpu7h2$ob3$1@eskinews.eskimo.com... > No, NE and SA are both Philips prefixes, but different temperature > ratings. NE is the commercial range of 0 to +70 deg C, SA the > mil/industrial range of -40 to +85 deg C. Since Phillips bought up Signetics, it makes sense they would keep the part number. And it occurred to me that I have gotten NE602's long after the SA parts appeared. HOWEVER, Phillips lists no NE parts under their RF parts, nor as parts "similar to" the SA602. Although it is certainly not exhaustive, all the "NE" parts still in my parts drawer have Signetics logos (no 602's tho - 604/605/614/615 all my 602/612's are SA). .. Article: 95996 of rec.radio.amateur.homebrew From: "Joel Kolstad" Subject: Re: Compensating frequency response of wideband amplifiers Date: Mon, 9 Jan 2006 12:32:08 -0800 Message-ID: <11s5i26huon5p5e@corp.supernews.com> References: <11s49mnbl1hmg3e@corp.supernews.com> "John Miles" wrote in message news:MPG.1e2c58276a2da3e9989722@news-central.giganews.com... > Why would you need specs like that? Obscenely wideband (>500MHz) software-defined radios. There are people out there asking for such things to be built -- hence the question! (And wondering whether or they're just having pipe dreams and technology just isn't there yet...) Article: 95997 of rec.radio.amateur.homebrew From: "The Magnum" Subject: Re: Consti-google-pated? Date: Mon, 9 Jan 2006 21:12:27 -0000 Message-ID: References: <1136718378.765976.269670@o13g2000cwo.googlegroups.com> <7rc5s1p75c84cdlh0lb20klorlkjeotef9@4ax.com> wrote in message news:7rc5s1p75c84cdlh0lb20klorlkjeotef9@4ax.com... > On 8 Jan 2006 03:06:18 -0800, "Orator For Decency" > wrote: > > >Multitudinous and profuse apologies for > >the repetitive creativity - in a number of posts, > >I thought I was dreaming - surely I'd posted > >but it didn't appear, so I reposted. Now it appears > >that I wasn't dreaming and it was simply that > >the consti archive was googlepated > > It's due to all of the crap you keep posting. > > HTH > > Old Nick. Oh my god, I'm in agreement with you once more... Please forgive me :o) Graham -- -.-. -... / .-. .- -.. .. --- Radio is only a Hobby. Don't let it rule your life... 73/51 - Graham, 26-Golf Charlie-19 Article: 95998 of rec.radio.amateur.homebrew Date: Mon, 09 Jan 2006 13:16:56 -0800 From: Tim Wescott Subject: Re: Compensating frequency response of wideband amplifiers References: <11s49mnbl1hmg3e@corp.supernews.com> Message-ID: Joel Kolstad wrote: > Could someone point me in the direction of how you might go about flattening > the frequency response of a wideband amplifier MMIC? I'm looking at something > like the Watkin-Johnson ECG003 (http://www.wj.com/pdf/ECG003.pdf) and noticing > that the response drops a little over 2dB from 500MHz to 2.5GHz. Assuming > that I've got plenty of SNR, component count isn't a big deal, and I don't > mind tweaking trimmers, how might I go about flattening that respone to, say, > 0.5dB or better across that range? Or is it just not very practical? > > Thanks, > ---Joel Kolstad > > > A lead-lag filter with the pole out beyond 2.5GHz may do it for you, but I have no idea how you'd actually implement it. Ditto for cleverly placed stubs. And don't call me when the next batch has slightly different characteristics, or when the one you have varies with temperature. I recall someone writing about this in QEX quite a while back -- it was his first time designing an IF for a radar, and it had to be WIDE band. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Article: 95999 of rec.radio.amateur.homebrew Date: Mon, 09 Jan 2006 13:17:42 -0800 From: Tim Wescott Subject: Re: Compensating frequency response of wideband amplifiers References: <11s49mnbl1hmg3e@corp.supernews.com> <11s5i26huon5p5e@corp.supernews.com> Message-ID: Joel Kolstad wrote: > "John Miles" wrote in message > news:MPG.1e2c58276a2da3e9989722@news-central.giganews.com... > >>Why would you need specs like that? > > > Obscenely wideband (>500MHz) software-defined radios. There are people out > there asking for such things to be built -- hence the question! (And > wondering whether or they're just having pipe dreams and technology just > isn't there yet...) > > > You have a digital system, which can presumably fix this in software, and you want to go sticking _trimmers_ in your circuit?!? -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Article: 96000 of rec.radio.amateur.homebrew From: Joerg Subject: Re: Doppler Radar References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> Message-ID: Date: Mon, 09 Jan 2006 21:45:23 GMT Hello Jim, > Good idea, Joerg. Where do I get onesie-twosie IR sensors that will trigger > at 3 meters or better? > No idea but one source might be remote controls and the corresponding receiver diode in the set or from a stereo. I bet that Radio Shack will have something if there still is one in your area (our became a cell phone store). You'd need a crude reflector on the other side, piece of metal or white board. Another source might be if someone replaces their garage door opener. They usually come complete with the child protect barrier and most people will throw out the old one. Thing is, you need at least two sets. The LEDs could be running all the time and you just have to sense the receive elements. There is yet one more method: Two coils next to the road, each with oscillator. On fence posts, wherever. A car will de-tune it or, if set on the edge of the stable feedback range, would stop the oscillator momentarily. In contrast to the IR method and the Doppler method this can be made pretty weather proof from cheap wire. Regards, Joerg http://www.analogconsultants.com Article: 96001 of rec.radio.amateur.homebrew From: Ken Scharf Subject: Dual jfet Message-ID: Date: Mon, 09 Jan 2006 17:01:59 -0500 I'm building a circuit that calls for a dual monolithic jfet. Can I use two discrete jfets that I have matched for IDSS in the circuit? They are in TO92 plastic cases, I can glue the two in contact with each other so they end up at the same temperature. Article: 96002 of rec.radio.amateur.homebrew From: "Joel Kolstad" Subject: Re: Compensating frequency response of wideband amplifiers Date: Mon, 9 Jan 2006 14:10:24 -0800 Message-ID: <11s5nt124ecohfd@corp.supernews.com> References: <11s49mnbl1hmg3e@corp.supernews.com> <11s5i26huon5p5e@corp.supernews.com> Hi Tim, "Tim Wescott" wrote in message news:S4ydndHNJslyT1_eRVn-qQ@web-ster.com... > You have a digital system, which can presumably fix this in software, and > you want to go sticking _trimmers_ in your circuit?!? The amps are well before the ADCs -- ADCs that sample at anything approaching 1Gsps have atrocious dynamic range compared to an analog signal processing chain with a decent noise floor (e.g., 6 bits giving about 40dB dynamic range vs. 80-100dB dynamic range back in the analog domain). Article: 96003 of rec.radio.amateur.homebrew From: "Steve Nosko" Subject: Re: Dick Smith Radio Direction Finder Date: Mon, 9 Jan 2006 16:18:57 -0600 Message-ID: References: Gary, I'm in the process of finishing a new display for my "Roanoke Doppler". Do a search on that name and you'll get many hits. For just the antenna, the Homing In Web site has info on both main types in common use. I'm not sure what the Dick Smith does, but perhaps Homing-In talks about it. Homing In is the place to start: http://members.aol.com/homingin/index.html It has antenna system (typically 1/4 wave whips for the Ham units) references: Down a ways on the main page under Home Built: http://members.aol.com/homingin/newdopant2.html This specificlly addresses the Dick Smith unit: http://members.aol.com/homingin/DSEfix.html You can always email K0OV. 73, Steve, K,9.D;C'I "Gary Smith" wrote in message news:dps7ih$cj$1@news-01.bur.connect.com.au... > Dave, if i had a manual with info on how to build one i'd be down the > electronics shop getting the bits and building one as we speak :> > > Gary > > "Dave" wrote in message > news:Aq-dnVewhKvCg1zeRVn-jw@crocker.com... > > they never came with antennas that i know of, you had to build them > > yourself. the plans for the asu including circuit board and parts list > > are in the manual, they are simple things that you should be able to find > > at any radio parts store... assuming you can find one of those today. > > Article: 96004 of rec.radio.amateur.homebrew From: "Steve Nosko" Subject: Re: Dick Smith Radio Direction Finder Date: Mon, 9 Jan 2006 16:24:30 -0600 Message-ID: References: <43C15BA4.3F39@orcon.net.nz> <5JOdnSO7esrq51zeRVn-vA@comcast.com> <43C18707.12BE@orcon.net.nz> "Glenn McAllister" <"(callsign)"@orcon.net.nz> wrote in message news:43C18707.12BE@orcon.net.nz... > ... > The ones in the box switch one of the antennas at a time to the RDF, and > the ones at the base of the antennas groung the out-of-use antennas. > > Glenn ZL2TLD The standard advise from K0OV is to NOT ground the unused antennas, but to leave them open which is in a non resonant state. This is so they have minimal effect on the active antenna and thus do not act like a parasitic element. I'm not sure why, but he recommends having NO amplitude (pattern) effects in your system. 73, Steve, K9DCI. Article: 96005 of rec.radio.amateur.homebrew From: "Steve Nosko" Subject: Re: Identifying a mystery diode Date: Mon, 9 Jan 2006 16:49:24 -0600 Message-ID: References: >From the looks of the package, Varactor or PIN diode. I think varactors will have a 0.7 Vf possibly eliminating that, but don't recall PIN diode Vf. Been too long...Do IR LEDS have that voltage? Crack some open. There may be multiple die or something. Steve K9DCI "Paul VK3DIP" wrote in message news:cXjtf.136133$V7.93540@news-server.bigpond.net.au... > Hi all I recently purchased a bag of unmarked supposedly diodes and I am > trying to figure out what they are. The clues so far are normal diode > action on a multimeter (ie conducts one way but not the other) but the > forward voltage is high at about 1.4 - 1.5 volts. The packaging is a small > square black plastic box with flat axial leads one of which has a small > cross > piece on it. This packaging suggests small signal or at least low power. > > If anyone wants to look at the mystery diode it is the top one > in this picture. > http://www.users.bigpond.com/pmcmahon/mysterydiode.jpg > The bottom one is a normal glass 1N914 just for scale. > > There is nowhere for the light to come out (or in) so they are not LEDs > which is the only other diode like component I have come across with that > high a forward voltage. Could it be two silicon diodes in series? > > Any suggestions or even just identifying the case outline would be > appreciated. > > Thanks > Paul VK3DIP > > > Article: 96006 of rec.radio.amateur.homebrew From: "Steve Nosko" Subject: Re: Doppler Radar Date: Mon, 9 Jan 2006 17:00:44 -0600 Message-ID: References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> I don't know where this thread went, but... Perhaps I missed it, but try searching on Gunplexer. That should get you to the ham sites where such things are talked about and sources named. Hams use them on 10 GHz and it would be a simple matter to detect the Doppler freq and do some sort of frequency detect. Oh hell. here's some of my links: http://www.g3pho.free-online.co.uk/microwaves/wideband.htm http://www.kwarc.org/10ghz/10GHZ-4.htm 73, Steve, K,9.D;C'I "RST Engineering" wrote in message news:5f129$43c01647$4251d54c$538@DIALUPUSA.NET... > Back in the '60s and early '70s I did some work with Impatt and Gunn diodes, > building a little self-detecting doppler for speed sensing. However, 35 > years have passed and my notebooks for that stuff are somewhere in a dusty > archive along with my venerable sliderule. > > Is there a cheap source for onesies-twosies of a radar front-end that will > give me doppler audio as a function of a large metal object's speed at a > range of 20 meters or so? I don't need to go into production on this thing, > just build one. A surplus source would be ideal. > > It seems that the little kids on our rural country lane have all become > teenagers at once and are trying to outdo the others in how fast they can > drive daddy's car up and down the lane. We've lost one dog this week and > unless I can put up some sort of a siren that goes off when they exceed some > agreed upon limit, the carnage will continue. > > > Regards, > > > Jim > > > Article: 96007 of rec.radio.amateur.homebrew From: "Steve Nosko" Subject: Re: Whatever happened to Date: Mon, 9 Jan 2006 17:10:03 -0600 Message-ID: References: <1136653023.889804.5600@f14g2000cwb.googlegroups.com> <1f46a$43c29363$a6661e10$12080@ALLTEL.NET> Yep and for QST articles. Fred does a good job, as I understand. 73, Steve, K,9.D;C'I "Nightingale" wrote in message news:1f46a$43c29363$a6661e10$12080@ALLTEL.NET... > yzordderrex@verizon.net wrote: > > Circuit Board Specialists out of Pueblo Colorado? > > > > They supplies pc boards and parts for ARRL handbook projects. > > > > 73 > > Bob > > N9NEO > > > > I don't know about Circuit Board Specialists, but doesn't Far Circuits > provide this service? > > -N Article: 96008 of rec.radio.amateur.homebrew From: Ken Scharf Subject: Re: 1N4007 varactors References: Message-ID: Date: Mon, 09 Jan 2006 20:01:43 -0500 Dr. Grok wrote: > Maybe I'm confusing this with something else but I always thought 1N4007's > were 1000 V PIV, 1 A rectifiers. > > I believe "any" diode has varactor characteristics to some extent but if you > need a varactor you'd be better off using one designed as a varactor. > > Dr. G. > > > > In article , JE wrote: > >>The common 1N4007 seem to work for HF but what is the max. frequency they >>can be used as varactors? >> >>And how about zener diodes? >> >>JE All diodes exhibit varactor and zener traits but not all are stable as such. All diodes when reverse biased exhibit a value of capacitance across them. In most cases it's usually quite small, less than 5 to 10pf. Increase the reverse bias and the capacitance goes down. At very high frequencies the capacitance change is enough to make a useful tuning diode. If you need a varactor to work at medium to high frequencies the tuning effect won't be very useful and you should use a true varactor diode. Such diodes have either larger areas, or thinner substrates to increase th capacitance. Any diode will work as a Zener, the zener voltage is where the reverse breakdown occurs. In a true Zener, the breakdown voltage is stable over a large range of current without the diode self destructing. Using a common diode as a zener requires limiting the reverse current to a small value, but if the current isn't large enough the zener voltage won't be stable. And yes the 1n4007 is a 1000 vpiv rectifier diode. It also makes a good rf switching diode thanks to it's PIN like structure. It's also quite cheap. Article: 96009 of rec.radio.amateur.homebrew From: Jim Thompson Subject: Re: Doppler Radar Message-ID: References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <43C316F3.CCBBC619@Hovnanian.com> Date: Mon, 09 Jan 2006 19:23:32 -0700 On Mon, 09 Jan 2006 18:07:47 -0800, "Paul Hovnanian P.E." wrote: >RST Engineering wrote: >> >> Back in the '60s and early '70s I did some work with Impatt and Gunn diodes, >> building a little self-detecting doppler for speed sensing. However, 35 >> years have passed and my notebooks for that stuff are somewhere in a dusty >> archive along with my venerable sliderule. >> >> Is there a cheap source for onesies-twosies of a radar front-end that will >> give me doppler audio as a function of a large metal object's speed at a >> range of 20 meters or so? I don't need to go into production on this thing, >> just build one. A surplus source would be ideal. >> >> It seems that the little kids on our rural country lane have all become >> teenagers at once and are trying to outdo the others in how fast they can >> drive daddy's car up and down the lane. We've lost one dog this week and >> unless I can put up some sort of a siren that goes off when they exceed some >> agreed upon limit, the carnage will continue. > >A strobe light. The radar 'your speed is..' signs don't do much to >discourage the a*holes. They just try to see what sort of quarter mile >speed they can hit. > >The ones with the strobe make them wonder whether they'll be getting one >of those photo tickets in the mail. How about a sign that says, "Shotgun automatically triggered when speed exceeds 25MPH" ?:-) ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. Article: 96010 of rec.radio.amateur.homebrew From: Allison-nospam@nouce.bellatlantic.net Subject: Re: Dual jfet Message-ID: <9p66s19rmkku9upjssedmbh4m4l7089dlu@4ax.com> References: Date: Tue, 10 Jan 2006 02:29:05 GMT On Mon, 09 Jan 2006 17:01:59 -0500, Ken Scharf wrote: >I'm building a circuit that calls for a dual monolithic >jfet. Can I use two discrete jfets that I have matched >for IDSS in the circuit? They are in TO92 plastic >cases, I can glue the two in contact with each other >so they end up at the same temperature. Yes, you can but the closer the match the better. Two parts form the same lot/datecode with the same IDSS should be ok. I've done this with MPF102s (a wide tolerence part) with good results in all but extremely critical designs. Allison Article: 96011 of rec.radio.amateur.homebrew From: "Rich Grise, but drunk" Subject: Re: Doppler Radar Message-ID: References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <43C316F3.CCBBC619@Hovnanian.com> Date: Tue, 10 Jan 2006 03:40:59 GMT On Mon, 09 Jan 2006 19:23:32 -0700, Jim Thompson wrote: > On Mon, 09 Jan 2006 18:07:47 -0800, "Paul Hovnanian P.E." >>RST Engineering wrote: ... >>> It seems that the little kids on our rural country lane have all become >>> teenagers at once and are trying to outdo the others in how fast they can >>> drive daddy's car up and down the lane. We've lost one dog this week and >>> unless I can put up some sort of a siren that goes off when they exceed some >>> agreed upon limit, the carnage will continue. >> >>A strobe light. The radar 'your speed is..' signs don't do much to >>discourage the a*holes. They just try to see what sort of quarter mile >>speed they can hit. >> >>The ones with the strobe make them wonder whether they'll be getting one >>of those photo tickets in the mail. > > How about a sign that says, "Shotgun automatically triggered when > speed exceeds 25MPH" ?:-) > > ...Jim Thompson Leave it to Thompson to come up with one that involves lethal violence. At least the booby-trap I suggested only involves noise and damage to the car's paint ( and maybe sheet metal, depending how fast they're going and what's in the garbage cans. ) Cheers! Rich Article: 96012 of rec.radio.amateur.homebrew From: none Subject: Re: What Does Your Electronics Workshop Look Like? Message-ID: <2kc6s1hjn2v97b43omppirch2t4f9lr066@4ax.com> References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> <1136694189.674426.115940@g14g2000cwa.googlegroups.com> Date: Mon, 09 Jan 2006 22:16:24 -0600 On 8 Jan 2006 18:58:29 -0800, "Too_Many_Tools" wrote: >Thanks for all the responses.... > >A few more questions.... > >How many of you use racks to hold your test equipment? > Mostly shelves especially sized for the test gear. >If you do use racks, how do you have your equipment arranged? > Most frequently used test jigs front and center on the shelf directly over my bench, less often used jigs to either side and portable meters(vom's esr's etc...) on the test bench to the rear or stored in drawers directly under the bench.( hand tools such as screwdrivers and such are mounted on the wall in 2x4's with drilled holes or clamps/hooks to hold them.) >Are the racks full length racks or do you have part rack and part >cabinet? > >How do you handle parts storage? Metal storage cabinets for some parts.(most frequently used.) others stored in plastic storage tubs with lids(pushed under cabinets or shelves) Also some metal shop shelves for aerosols/cleaners/abrasives/paints etc... I've also been fortunate in obtaining metal storage cabinets with drawers from local hardware stores that toss them when remodeling, indispensable when trying to collate the massive amount of nuts/bolts/screw and small parts I accumulate from scrap salvage or toss offs of others.(I probably hold the title for worlds biggest parts scrounge.) > >How about lighting? > >TMT Article: 96013 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: 1N4007 varactors Date: Mon, 09 Jan 2006 20:25:42 -0800 Message-ID: <11s6dq7ekpo3o30@corp.supernews.com> References: Ken Scharf wrote: > > All diodes exhibit varactor and zener traits but not all are stable > as such. All diodes when reverse biased exhibit a value of capacitance > across them. In most cases it's usually quite small, less than 5 to 10pf. > Increase the reverse bias and the capacitance goes down. At very high frequencies > the capacitance change is enough to make a useful tuning diode. If you need > a varactor to work at medium to high frequencies the tuning effect won't be > very useful and you should use a true varactor diode. Such diodes have > either larger areas, or thinner substrates to increase th capacitance. > . . . Zener diodes have much more capacitance than this, with the amount of C being greater as the zener voltage gets lower. It's been a long time since I've looked at this, but as I recall you can get well over 100 pF >from something like a 5 V zener. For the same reason, reverse biased E-B junctions can give quite a bit of C. Of course, the limited breakdown voltage limits your tuning range. Higher power zeners have higher C yet. I've used zeners for varicaps many times in HF rigs, to offset a VFO when switching bands, and for RIT. Haven't tried one as the main tuning capacitor, but I haven't tried a regular varicap, either. Diodes specified for varicap use have more predictable capacitance-vs-voltage characteristics, and you can get a variety of different characteristics. They might have lower noise, too, but I've never used one in an application where that was critical, so don't know if that's the case. But for a lot of one-off projects, zeners work fine as varicaps. As for using something else as zeners, emitter-base junctions work well. You don't get much variety, though -- most break down at around 5-6 volts. I've got a power supply I built over 30 years ago which uses a couple of series transistor E-B junctions as the voltage reference. It's still my main bench supply. Roy Lewallen, W7EL Article: 96014 of rec.radio.amateur.homebrew From: none Subject: Re: What Does Your Electronics Workshop Look Like? Message-ID: References: <1134520239.071671.96720@g44g2000cwa.googlegroups.com> <1136770300.583119.201460@g43g2000cwa.googlegroups.com> Date: Mon, 09 Jan 2006 22:29:42 -0600 On 8 Jan 2006 17:31:40 -0800, "Too_Many_Tools" wrote: >Thanks for the responses.... > >Of those who use racks to hold their equipment, how do you have the >equipment arranged and how are the racks distributed? > >For storage, what do you use? What works and what does not? > >How about lighting? Flourescent, mainly because I can get the fixtures for nothing. People are always tossing them out in all shapes and sizes.(Some can be extremely wasteful when remodeling or rebuilding.) Also flouro is of course much more efficient resulting in much lower electricity bills for your shop. I also have a number of the flex-arm work lights, both flourescent as well as incandescent. I have one mounted on the corner of my work bench for all the close up work I have to do.(The incandescent flex-arm lamps can easily be converted to flouro for general work by using a screw in spiral tube flourescent bulb , or converted back to high watt incandescent for work requiring more intense light.) People toss out those flourescent aquarium light fixtures all the time. Most are 18 inch and make excellent under shelf light fixtures for light directly on the bench. The tubes are easily swapped out for normal balanced tubes and the black plastic housing usually have open spaces on either end to allow drilling holes for mounting to the under shelf.( I use #8 x 1 inch sheet metal screws with fender washers to mount them. takes just a couple of minutes and you've got a nifty under shelf light for next to nothing.) > >Thanks > >TMT Article: 96015 of rec.radio.amateur.homebrew Subject: Re: 1N4007 varactors From: JE References: <11s6dq7ekpo3o30@corp.supernews.com> Message-ID: Date: Mon, 09 Jan 2006 23:38:29 -0500 It was just that they are dirt cheap and available. I'll pony up for real ones. JE Article: 96016 of rec.radio.amateur.homebrew Subject: Re: LMX2322? From: JE References: <5da6a$43c1fbbd$d135c4af$24772@MDI.CA> Message-ID: <70af8$43c33ab5$d135c4af$24670@MDI.CA> Date: Mon, 09 Jan 2006 23:40:21 -0500 Not much feedback. Anyone suggest a prescaler, preferably hard wired to divide by say 64? JE Article: 96017 of rec.radio.amateur.homebrew Message-ID: <43C344B3.E0082999@earthlink.net> From: "Michael A. Terrell" Subject: Re: Doppler Radar References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <43C316F3.CCBBC619@Hovnanian.com> Date: Tue, 10 Jan 2006 05:23:42 GMT Jim Thompson wrote: > > How about a sign that says, "Shotgun automatically triggered when > speed exceeds 25MPH" ?:-) > > Jim Thompson This from someone who brags about speeding? I say go for it, anywhere you normally drive. If it works out ok on you, they can try it in other cities. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida Article: 96018 of rec.radio.amateur.homebrew From: "Joel Kolstad" Subject: Re: Compensating frequency response of wideband amplifiers Date: Mon, 9 Jan 2006 21:44:53 -0800 Message-ID: <11s6iejqofn2eb0@corp.supernews.com> References: <11s49mnbl1hmg3e@corp.supernews.com> <11s5i26huon5p5e@corp.supernews.com> <11s5nt124ecohfd@corp.supernews.com> <1136855283.581896.237030@o13g2000cwo.googlegroups.com> Thanks for the hints, Tom, I'll look into them. "K7ITM" wrote in message news:1136855283.581896.237030@o13g2000cwo.googlegroups.com... > And what use would a 6 bit wideband system be anyway? What are you > receiving with it that doesn't require more dynamic range than you'll > get with 6 bits? As far as I'm aware, pretty much all high data rate digital modulation schemes can be recovered with 6 bits (or less). > And if you're only sampling at 1GHz, why are you > worried about anything more than about 400MHz bandwidth? OK, 1.25Gsps? :-) I'm just talking ballpark figures. ---Joel Article: 96019 of rec.radio.amateur.homebrew From: Paul Keinanen Subject: Re: Doppler Radar Message-ID: References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <43C019C6.1090301@invalid.invalid> <525cb$43c01ac5$4251d54c$723@DIALUPUSA.NET> <268bb$43c0784d$42512485$4526@DIALUPUSA.NET> Date: Tue, 10 Jan 2006 09:24:17 +0200 On Sat, 7 Jan 2006 18:25:20 -0800, "RST Engineering" wrote: >What a fu**ing jerk. I asked a technical question in a technical newsgroup. >I expect a technical answer. > >As to your political and ethical questions to my question, go find another >newsgroup to tell others how to live. I just wonder why you are posting to an amateur radio newsgroup ? Your rambling about speed traps has nothing to do with amateur radio. Paul OH3LWR Article: 96020 of rec.radio.amateur.homebrew From: "Joel Kolstad" Subject: Re: Compensating frequency response of wideband amplifiers Date: Tue, 10 Jan 2006 01:12:52 -0800 Message-ID: <11s6ukhn6r1v9c8@corp.supernews.com> References: <11s49mnbl1hmg3e@corp.supernews.com> <11s5i26huon5p5e@corp.supernews.com> <11s5nt124ecohfd@corp.supernews.com> <1136855283.581896.237030@o13g2000cwo.googlegroups.com> <11s6iejqofn2eb0@corp.supernews.com> <1136877579.996427.266290@z14g2000cwz.googlegroups.com> Hi Tom, "K7ITM" wrote in message news:1136877579.996427.266290@z14g2000cwz.googlegroups.com... > "radio" implied to me that you are dealing with a multitude of signals > in that bandwidth, not just one, and my practical experience tells me > that you will have to deal with a wide dynamic range. What do you do > with the interfering signal that's 20dB above your signal of interest? Ah, the classic wideband SDR problem! You filter it out, of course, with an adjustable notch filter (or two or three or...). Or at least that's all I know to do about them... > OK, so 1.25Gsps gets you to maybe 500MHz bandwidth. That's still a far > cry from 2GHz. Why would you be worried about the flatness over 2GHz > when your bandwidth is "only" 500MHz? So that you can tune around over 2 or 3GHz and everything's still flat. I realize that's probably not really absolutely necessary, but as I say, people are asking for these levels of flatness, and if it's readily doable sometimes it's easier just to do what's ask rather than try to educate them about why their request isn't really needed. :-) ---Joel Article: 96021 of rec.radio.amateur.homebrew From: Allison-nospam@nouce.bellatlantic.net Subject: Re: 1N4007 varactors Message-ID: <7ma7s1pfp5ouldahdnkhek1bfglncb8qo4@4ax.com> References: <11s6dq7ekpo3o30@corp.supernews.com> Date: Tue, 10 Jan 2006 12:44:12 GMT On Mon, 09 Jan 2006 23:38:29 -0500, JE wrote: >It was just that they are dirt cheap and available. >I'll pony up for real ones. > >JE I'd go with try it first. Also base collector junction of many transistors is fairly decent varactor. Low power transistors tend to be low capacitance and the amount of capacitance increases with device dies size (power level). Allison Article: 96022 of rec.radio.amateur.homebrew From: "Ian" Subject: Re: Doppler Radar Date: Tue, 10 Jan 2006 14:49:12 -0000 Message-ID: <1136903656.80601@newsreg.cos.agilent.com> References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> <23e07$43c044e8$4251d54c$3390@DIALUPUSA.NET> <43C124D6.3080004@nospam.com> <43c1d7fb$0$501$a726171b@news.hal-pc.org> <3602b$43c1e206$42513109$23602@DIALUPUSA.NET> <4cv4s1h2tusoukac1mq2vea7va0c3aciu3@4ax.com> <42ff9iF1irg5vU1@individual.net> <1h45s1htokfokma462vsi864j086s3sqnf@4ax.com> "Jim Thompson" wrote in message news:1h45s1htokfokma462vsi864j086s3sqnf@4ax.com... > Google Earth... > > Intersection of Cholla St. and 68th St., Scottsdale, AZ 85254 > > LAT 33.589390° > > LON -111.935610° > > There are quite a few of this type in Scottsdale and in Carefree/Cave > Creek, AZ. > > Phoenix tends toward speed bumps, but is also looking into > round-abouts. > > Scroll a few blocks SW from there to the NW corner of Desert Cove and > 66th St., and you'll see the acre I lived on from 1969 to 1994. > > I always referred to the Cholla/68th St. intersection as the "drunk > catcher", because there's a dip there as well... rain drain channel > ;-) > > ...Jim Thompson Anyone point me to how do you enter Latitude and Longitude into Google Earth? Regards Ian Article: 96023 of rec.radio.amateur.homebrew From: Jim Thompson Subject: Re: Doppler Radar Message-ID: <97k7s1lg82b4b349paksibsdb68uab9lre@4ax.com> References: <23e07$43c044e8$4251d54c$3390@DIALUPUSA.NET> <43C124D6.3080004@nospam.com> <43c1d7fb$0$501$a726171b@news.hal-pc.org> <3602b$43c1e206$42513109$23602@DIALUPUSA.NET> <4cv4s1h2tusoukac1mq2vea7va0c3aciu3@4ax.com> <42ff9iF1irg5vU1@individual.net> <1h45s1htokfokma462vsi864j086s3sqnf@4ax.com> <1136903656.80601@newsreg.cos.agilent.com> Date: Tue, 10 Jan 2006 08:23:20 -0700 On Tue, 10 Jan 2006 14:49:12 -0000, "Ian" wrote: > >"Jim Thompson" wrote in >message news:1h45s1htokfokma462vsi864j086s3sqnf@4ax.com... > >> Google Earth... >> >> Intersection of Cholla St. and 68th St., Scottsdale, AZ 85254 >> >> LAT 33.589390° >> >> LON -111.935610° >> >> There are quite a few of this type in Scottsdale and in Carefree/Cave >> Creek, AZ. >> >> Phoenix tends toward speed bumps, but is also looking into >> round-abouts. >> >> Scroll a few blocks SW from there to the NW corner of Desert Cove and >> 66th St., and you'll see the acre I lived on from 1969 to 1994. >> >> I always referred to the Cholla/68th St. intersection as the "drunk >> catcher", because there's a dip there as well... rain drain channel >> ;-) >> >> ...Jim Thompson > >Anyone point me to how do you enter Latitude and Longitude into Google >Earth? > >Regards > Ian > I don't know either, I just put in Cholla & Scottsdale Rd, Scottsdale, AZ 85254 and then scrolled west. I then read off and noted the latitude and longitude in case someone knew how to do it directly. ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. Article: 96024 of rec.radio.amateur.homebrew From: Spehro Pefhany Subject: Re: Doppler Radar Date: Tue, 10 Jan 2006 11:40:05 -0500 Message-ID: <5do7s1tf2t4q8i622q5v6hs3ta04ftani1@4ax.com> References: <23e07$43c044e8$4251d54c$3390@DIALUPUSA.NET> <43C124D6.3080004@nospam.com> <43c1d7fb$0$501$a726171b@news.hal-pc.org> <3602b$43c1e206$42513109$23602@DIALUPUSA.NET> <4cv4s1h2tusoukac1mq2vea7va0c3aciu3@4ax.com> <42ff9iF1irg5vU1@individual.net> <1h45s1htokfokma462vsi864j086s3sqnf@4ax.com> <1136903656.80601@newsreg.cos.agilent.com> <97k7s1lg82b4b349paksibsdb68uab9lre@4ax.com> On Tue, 10 Jan 2006 08:23:20 -0700, the renowned Jim Thompson wrote: >On Tue, 10 Jan 2006 14:49:12 -0000, "Ian" > wrote: > >> >>"Jim Thompson" wrote in >>message news:1h45s1htokfokma462vsi864j086s3sqnf@4ax.com... >> >>> Google Earth... >>> >>> Intersection of Cholla St. and 68th St., Scottsdale, AZ 85254 >>> >>> LAT 33.589390° >>> >>> LON -111.935610° >>> >>> There are quite a few of this type in Scottsdale and in Carefree/Cave >>> Creek, AZ. >>> >>> Phoenix tends toward speed bumps, but is also looking into >>> round-abouts. >>> >>> Scroll a few blocks SW from there to the NW corner of Desert Cove and >>> 66th St., and you'll see the acre I lived on from 1969 to 1994. >>> >>> I always referred to the Cholla/68th St. intersection as the "drunk >>> catcher", because there's a dip there as well... rain drain channel >>> ;-) >>> >>> ...Jim Thompson >> >>Anyone point me to how do you enter Latitude and Longitude into Google >>Earth? >> >>Regards >> Ian >> > >I don't know either, I just put in Cholla & Scottsdale Rd, Scottsdale, >AZ 85254 and then scrolled west. > >I then read off and noted the latitude and longitude in case someone >knew how to do it directly. > > ...Jim Thompson Try pasting this into the search bar: 33 30 11.57N 111 55 46.22W Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com Article: 96025 of rec.radio.amateur.homebrew From: "Steve Nosko" Subject: Re: Dual jfet Date: Tue, 10 Jan 2006 10:17:45 -0600 Message-ID: References: Depends on the particular application, but this sounds reasonable. However, rather than IDss, I'd shoot for what ever bias current they are operated at, though IDss may work, 73, K,9.D;C'I "Ken Scharf" wrote in message news:S0Bwf.21079$__4.19198@bignews1.bellsouth.net... > I'm building a circuit that calls for a dual monolithic > jfet. Can I use two discrete jfets that I have matched > for IDSS in the circuit? They are in TO92 plastic > cases, I can glue the two in contact with each other > so they end up at the same temperature. Article: 96026 of rec.radio.amateur.homebrew From: "Steve Nosko" Subject: Re: 1N4007 varactors Date: Tue, 10 Jan 2006 10:28:36 -0600 Message-ID: References: Dr. G, You are correct, but many circuits have used the 1N4000 series diodes as varactors with acceptable results. Any diode is a varactor (even transistor junctions), but those called varactors are just optimized for and measured/spec'ed as variable caps. If the cap value works in the circuit and losses/noise/whatever-else aren't a problem, then no problem. I chalk it up to: Some of us don't have the luxury of either well stocked basements or pocket books, or perhaps the willingness to run out to the local parts store (if you have one) and pick something out just to throw some neat little thingy together. Don't (some) zeners generate noise???...or is that only near the breakdown reigion? 73, Steve, K.9/D;C'I "Dr. Grok" wrote in message news:fvudnXpsnMvunV7eRVn-jA@rcn.net... > Maybe I'm confusing this with something else but I always thought 1N4007's > were 1000 V PIV, 1 A rectifiers. > > I believe "any" diode has varactor characteristics to some extent but if you > need a varactor you'd be better off using one designed as a varactor. > > Dr. G. > > > > In article , JE wrote: > >The common 1N4007 seem to work for HF but what is the max. frequency they > >can be used as varactors? > > > >And how about zener diodes? > > > >JE Article: 96027 of rec.radio.amateur.homebrew From: "OZ1LQB" References: <5da6a$43c1fbbd$d135c4af$24772@MDI.CA> Subject: Re: LMX2322? Date: Tue, 10 Jan 2006 20:40:05 +0100 Message-ID: <43c40d8c$0$199$edfadb0f@dread11.news.tele.dk> "JJ" skrev i en meddelelse news:5da6a$43c1fbbd$d135c4af$24772@MDI.CA... > I can't find the LMX2322 on National Semi site. > Can someone tell me a suitable replacement as I just need the 64x prescaler Hi.. have a look here. http://hem.passagen.se/communication/component.html oz1lqb Article: 96028 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: 1N4007 varactors Date: Tue, 10 Jan 2006 10:58:17 -0800 Message-ID: <11s84epqccvti43@corp.supernews.com> References: Steve Nosko wrote: > . . . > Don't (some) zeners generate noise???...or is that only near the breakdown > reigion? Some are very noisy. The noisiest I've seen have been ones in the 12 - 15 volt range when biased at considerably less than a mA. I've used one, followed by a 50 ohm amplifier "pill" IC, as a broadband noise source to see filter responses with a spectrum analyzer. The noise is easily visible well up into the UHF region. But all zeners generate some noise, so you have to use appropriate filtering in sensitive applications. In my experience, though, band gap references can be even noisier than a typical zener. Roy Lewallen, W7EL Article: 96029 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: Dual jfet Date: Tue, 10 Jan 2006 11:01:29 -0800 Message-ID: <11s84kphlachbc4@corp.supernews.com> References: If you match both Idss and Vp, they'll have the same Gm at all currents -- in theory. Roy Lewallen, W7EL Steve Nosko wrote: > Depends on the particular application, but this sounds reasonable. However, > rather than IDss, I'd shoot for what ever bias current they are operated at, > though IDss may work, > 73, K,9.D;C'I > > > "Ken Scharf" wrote in message > news:S0Bwf.21079$__4.19198@bignews1.bellsouth.net... > >>I'm building a circuit that calls for a dual monolithic >>jfet. Can I use two discrete jfets that I have matched >>for IDSS in the circuit? They are in TO92 plastic >>cases, I can glue the two in contact with each other >>so they end up at the same temperature. > > > Article: 96030 of rec.radio.amateur.homebrew From: "RST Engineering" References: <11s84epqccvti43@corp.supernews.com> Subject: Zener Noise (was: 1N4007 varactors) Date: Tue, 10 Jan 2006 14:30:01 -0800 Message-ID: <8e44$43c43569$42513d75$6585@DIALUPUSA.NET> Roy ... I've been playing around (ahem, excuse me, heuristically engineering) with zener noise sources for a while using the same spectrum analyzer trick and as yet I haven't been able to make the noise as "flat" across the passband as I'd like. I've tried varying the bias, the voltage, and a few other tricks, but as yet, no joy. Can you shed some light on what you've found to make the noise power/voltage fairly level across the band? Jim > > Some are very noisy. The noisiest I've seen have been ones in the 12 - 15 > volt range when biased at considerably less than a mA. I've used one, > followed by a 50 ohm amplifier "pill" IC, as a broadband noise source to > see filter responses with a spectrum analyzer. The noise is easily visible > well up into the UHF region. > > But all zeners generate some noise, so you have to use appropriate > filtering in sensitive applications. In my experience, though, band gap > references can be even noisier than a typical zener. > > Roy Lewallen, W7EL Article: 96031 of rec.radio.amateur.homebrew From: Winfield Hill Subject: Re: Zener Noise (was: 1N4007 varactors) Date: 10 Jan 2006 15:19:31 -0800 Message-ID: References: <11s84epqccvti43@corp.supernews.com> <8e44$43c43569$42513d75$6585@DIALUPUSA.NET> RST Engineering wrote... > >Roy ... > >I've been playing around (ahem, excuse me, heuristically engineering) with >zener noise sources for a while using the same spectrum analyzer trick and >as yet I haven't been able to make the noise as "flat" across the passband >as I'd like. I've tried varying the bias, the voltage, and a few other >tricks, but as yet, no joy. > >Can you shed some light on what you've found to make the noise power/voltage >fairly level across the band? Good zener noise sources are carefully bred and tested, they do _not_ come naturally from garden-variety zener diodes. I suggest you go read the hundred or so messages in the famous zener oscillation thread a few years back here on s.e.d. In this you'll learn of my substantial investigations into the topic, some physics - and, very important, learn what a zener microplasma is. You'll see my ASCII waveform plots of actual bench measurements showing exactly what's going on. After all this you may decide to avoid using zener diodes for calibrated noise sources. Sorry about that! -- Thanks, - Win Article: 96032 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: Zener Noise Date: Tue, 10 Jan 2006 14:46:43 -0800 Message-ID: <11s8hr3n9s6j360@corp.supernews.com> References: <11s84epqccvti43@corp.supernews.com> <8e44$43c43569$42513d75$6585@DIALUPUSA.NET> RST Engineering wrote: > Roy ... > > I've been playing around (ahem, excuse me, heuristically engineering) with > zener noise sources for a while using the same spectrum analyzer trick and > as yet I haven't been able to make the noise as "flat" across the passband > as I'd like. I've tried varying the bias, the voltage, and a few other > tricks, but as yet, no joy. > > Can you shed some light on what you've found to make the noise power/voltage > fairly level across the band? It's not particularly flat over the whole band, and I haven't attempted to make it be. My interest has been mostly in relatively narrow band filters, or the shape of a main filter rolloff. The noise is adequately flat over the bandwidths I've been interested in. It's been a while since I've fooled with it, but as I recall, the shape of the noise spectral distribution changed all over the map as I changed the diode bias. I imagine that it changes with temperature and with individual diodes, too. So any circuit used to flatten it would only work for a particular diode, current, and probably temperature. The bottom line is that it's probably a lousy way to try to generate a flat broadband noise spectrum. Roy Lewallen, W7EL Article: 96033 of rec.radio.amateur.homebrew Date: Wed, 11 Jan 2006 01:07:55 +0100 From: Sjouke Burry Subject: Re: Zener Noise References: <11s84epqccvti43@corp.supernews.com> <8e44$43c43569$42513d75$6585@DIALUPUSA.NET> Message-ID: <43c44c5b$0$10089$ba620dc5@text.nova.planet.nl> RST Engineering wrote: > Roy ... > > I've been playing around (ahem, excuse me, heuristically engineering) with > zener noise sources for a while using the same spectrum analyzer trick and > as yet I haven't been able to make the noise as "flat" across the passband > as I'd like. I've tried varying the bias, the voltage, and a few other > tricks, but as yet, no joy. > > Can you shed some light on what you've found to make the noise power/voltage > fairly level across the band? > > Jim > > > > >>Some are very noisy. The noisiest I've seen have been ones in the 12 - 15 >>volt range when biased at considerably less than a mA. I've used one, >>followed by a 50 ohm amplifier "pill" IC, as a broadband noise source to >>see filter responses with a spectrum analyzer. The noise is easily visible >>well up into the UHF region. >> >>But all zeners generate some noise, so you have to use appropriate >>filtering in sensitive applications. In my experience, though, band gap >>references can be even noisier than a typical zener. >> >>Roy Lewallen, W7EL > > > What I did for some project which needed equal amplitude uncorrelated noise,is amplify the zener noise with a wide band video opamp,with high pass and lowpass filtering. Used the low pass as input for a zero cross detector, delayed the zerocrossing 10 microseconds,and used that for clock to a circulating bit in a shift register. each parallel output of that register controlled a sample/hold opamp,sampling the highpass signal. Voila!! 8 audio frequency, non-correlated noise sources. The zerocrossing clock was made this way,to avoid detectable clock tones int the output.(2 to 20 microsec between crossings) the 10 microsecond delay was used to get a voltage at the sample and hold opamp which was not correlated to the zerocrossing. If you need only one signal ,leave out the shift register, and just use a 10 and a 1 microsec. oneshot for the s/h opamp clock. The application? A wind and engine noise generator for a car simulator. Article: 96034 of rec.radio.amateur.homebrew From: John Larkin Subject: Re: Zener Noise (was: 1N4007 varactors) Date: Tue, 10 Jan 2006 16:23:25 -0800 Message-ID: <0vj8s1p1ef4sroo1q2pe6klvqvpps0mmm6@4ax.com> References: <11s84epqccvti43@corp.supernews.com> <8e44$43c43569$42513d75$6585@DIALUPUSA.NET> On Tue, 10 Jan 2006 14:30:01 -0800, "RST Engineering" wrote: >Roy ... > >I've been playing around (ahem, excuse me, heuristically engineering) with >zener noise sources for a while using the same spectrum analyzer trick and >as yet I haven't been able to make the noise as "flat" across the passband >as I'd like. I've tried varying the bias, the voltage, and a few other >tricks, but as yet, no joy. > >Can you shed some light on what you've found to make the noise power/voltage >fairly level across the band? > >Jim > > > >> >> Some are very noisy. The noisiest I've seen have been ones in the 12 - 15 >> volt range when biased at considerably less than a mA. I've used one, >> followed by a 50 ohm amplifier "pill" IC, as a broadband noise source to >> see filter responses with a spectrum analyzer. The noise is easily visible >> well up into the UHF region. >> >> But all zeners generate some noise, so you have to use appropriate >> filtering in sensitive applications. In my experience, though, band gap >> references can be even noisier than a typical zener. >> >> Roy Lewallen, W7EL > These folks will sell you serious noise diodes... http://www.noisecom.com/NC/default.htm John Article: 96035 of rec.radio.amateur.homebrew From: Allison-nospam@nouce.bellatlantic.net Subject: Re: 1N4007 varactors Message-ID: References: <11s6dq7ekpo3o30@corp.supernews.com> Date: Wed, 11 Jan 2006 01:16:43 GMT On Wed, 11 Jan 2006 00:50:49 GMT, DRGrok@munged.net (Dr. Grok) wrote: >Zeners are also often used as noise sources, which might be a good reason NOT >to use them for the tuning, especially in a receiver. In the breakdown region yes, in the revserse bias region no. I've tried some .4w 22V Zeners and they are decent varactors save for you need to keep far enough from the 22V and -.5V or they exhibit their other charactersistics. Allison > >Dr. G. > > >In article <11s6dq7ekpo3o30@corp.supernews.com>, Roy Lewallen >wrote: >>Ken Scharf wrote: >>> >>> All diodes exhibit varactor and zener traits but not all are stable >>> as such. All diodes when reverse biased exhibit a value of capacitance >>> across them. In most cases it's usually quite small, less than 5 to 10pf. >>> Increase the reverse bias and the capacitance goes down. At very high >> frequencies >>> the capacitance change is enough to make a useful tuning diode. If you need >>> a varactor to work at medium to high frequencies the tuning effect won't be >>> very useful and you should use a true varactor diode. Such diodes have >>> either larger areas, or thinner substrates to increase th capacitance. >>> . . . >> >>Zener diodes have much more capacitance than this, with the amount of C >>being greater as the zener voltage gets lower. It's been a long time >>since I've looked at this, but as I recall you can get well over 100 pF >>from something like a 5 V zener. For the same reason, reverse biased E-B >>junctions can give quite a bit of C. Of course, the limited breakdown >>voltage limits your tuning range. Higher power zeners have higher C yet. >> >>I've used zeners for varicaps many times in HF rigs, to offset a VFO >>when switching bands, and for RIT. Haven't tried one as the main tuning >>capacitor, but I haven't tried a regular varicap, either. >> >>Diodes specified for varicap use have more predictable >>capacitance-vs-voltage characteristics, and you can get a variety of >>different characteristics. They might have lower noise, too, but I've >>never used one in an application where that was critical, so don't know >>if that's the case. But for a lot of one-off projects, zeners work fine >>as varicaps. >> >>As for using something else as zeners, emitter-base junctions work well. >>You don't get much variety, though -- most break down at around 5-6 >>volts. I've got a power supply I built over 30 years ago which uses a >>couple of series transistor E-B junctions as the voltage reference. It's >>still my main bench supply. >> >>Roy Lewallen, W7EL Article: 96036 of rec.radio.amateur.homebrew From: "Harold E. Johnson" References: <1136941627.419160.149340@o13g2000cwo.googlegroups.com> <1136944051.369424.311940@z14g2000cwz.googlegroups.com> Subject: Re: Inexpensive Digital Strip Chart Recorder Message-ID: Date: Wed, 11 Jan 2006 02:02:10 GMT >I would agree...I am surprised that in today's world of electronics > that an inexpensive turnkey appliance is not available. > > The uses for something like this is many....and I am not trying to be > specific since this will be used to measure a number of physical > parameters. > > Let's say one wants a digital solution to what a old HP 680 Strip Chart > Recorder would work for...is there anything out there today that works > the same? > > TMT Radio Shack used to sell a Metex VOM (Metex ME-11) that had a serial port output and software that made essentially a data logger which you could then pop into an excel or Quattro spreadsheet and massage the data anyway you liked. I bought two of them from their on-line catalog when they were on sale maybe 3 years ago, suspect you can still find them, maybe with an USB port these days. I use one of mine for metering the transmitted signal from NAA to detect SIDS. Lots more practical than my old Rustrak strip chart recorder, I can just throw away the "uninteresting" data and not use any paper at all. The other one is just a backup for my Fluke 77. W4ZCB Article: 96037 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: 1N4007 varactors Date: Tue, 10 Jan 2006 17:14:14 -0800 Message-ID: <11s8qfmj6pdv837@corp.supernews.com> References: <11s6dq7ekpo3o30@corp.supernews.com> Dr. Grok wrote: > Zeners are also often used as noise sources, which might be a good reason NOT > to use them for the tuning, especially in a receiver. You mean that a zener diode biased at less than breakdown voltage generates more noise than a diode specified for varactor use biased at less than breakdown? I assume this noise would be in the form of time jitter of the capacitance, since the leakage current would be very small. Have you seen this in some specification, or is it from experience? Roy Lewallen, W7EL Article: 96038 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: Favorite Tektronix Scope Date: Tue, 10 Jan 2006 17:16:14 -0800 Message-ID: <11s8qjeohg2n8c1@corp.supernews.com> References: <1136148561.946351.257400@g44g2000cwa.googlegroups.com> <29ijr15923pim2ih03vovp4rsr3mea6ihl@4ax.com> Ron wrote: > > Not to mention, Audio. > > THD is usefult to a point, but can't really tell how pleasant, > subjectively, the sound will be. A spectrum display provides the > missing insight. > Wow. Does it show you the improvement from cryogenically treated, oxygen-free speaker cables? Roy Lewallen, W7EL Article: 96039 of rec.radio.amateur.homebrew Message-ID: <43C47080.D4567C2A@earthlink.net> From: "Michael A. Terrell" Subject: Re: Hewlitt Packard 606A Sig gen.. References: <1136938324.782226.49880@g49g2000cwa.googlegroups.com> Date: Wed, 11 Jan 2006 02:43:17 GMT mrhaney wrote: > > Anyone have a manual,copy,or a schematic for the HP 606A . I want to > connect an external freq. counter and need a schematic.. tnx W4PQW.... > w4pqw@cox.net ftp://bama.edebris.com/bama/hp/606a/606a.pdf -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida Article: 96040 of rec.radio.amateur.homebrew Subject: Re: LMX2322? From: JE References: <5da6a$43c1fbbd$d135c4af$24772@MDI.CA> <43c40d8c$0$199$edfadb0f@dread11.news.tele.dk> Message-ID: <8a53b$43c4760c$d135c4af$3194@MDI.CA> Date: Tue, 10 Jan 2006 22:05:48 -0500 Great. I found the LMX2346 is a newer part and pin for pin compatible. Is there a simple primer on how to program this thing? I know there is the datssheet but it is a bit complicated, I am also trying to learn the PIC16F870. JE >> I can't find the LMX2322 on National Semi site. >> Can someone tell me a suitable replacement as I just need the 64x > prescaler > Hi.. > have a look here. > http://hem.passagen.se/communication/component.html > oz1lqb > > Article: 96041 of rec.radio.amateur.homebrew From: Rich Webb Subject: Re: Inexpensive Digital Strip Chart Recorder Message-ID: References: <1136941627.419160.149340@o13g2000cwo.googlegroups.com> <1136944051.369424.311940@z14g2000cwz.googlegroups.com> Date: Wed, 11 Jan 2006 03:19:13 GMT On 10 Jan 2006 17:47:31 -0800, "Too_Many_Tools" wrote: >I would agree...I am surprised that in today's world of electronics >that an inexpensive turnkey appliance is not available. > >The uses for something like this is many....and I am not trying to be >specific since this will be used to measure a number of physical >parameters. > >Let's say one wants a digital solution to what a old HP 680 Strip Chart >Recorder would work for...is there anything out there today that works >the same? Something like the USB-1208LS from Measurement Computing (I'd post a link but their referral/tag/cookie system seems to want two or three lines for the URL) plus an old laptop PC might do the trick. It's a relatively inexpensive USB gadget that comes with basic "strip chart" software as a demo app. They have other, faster, and more expensive models and more software, of course. IIRC, they still include their Universal Library w/ the device, so you can write your own apps with your own look & feel. Higher end stuff is available from places like http://www.astro-med.com/ ... and priced accordingly. Good gear, though. -- Rich Webb Norfolk, VA Article: 96042 of rec.radio.amateur.homebrew From: "Clif Holland" References: <1136148561.946351.257400@g44g2000cwa.googlegroups.com> <29ijr15923pim2ih03vovp4rsr3mea6ihl@4ax.com> <11s8qjeohg2n8c1@corp.supernews.com> Subject: Re: Favorite Tektronix Scope Message-ID: Date: Wed, 11 Jan 2006 03:35:46 GMT Sure it does Ray. Just like the two hams on 40 today. One had installed RG8 in place of 58 and wanted to know how much better his signal sounded. I almost fell off my stool.... -- Clif Holland KA5IPF www.avvid.com "Roy Lewallen" wrote in message news:11s8qjeohg2n8c1@corp.supernews.com... > Ron wrote: >> >> Not to mention, Audio. >> >> THD is usefult to a point, but can't really tell how pleasant, >> subjectively, the sound will be. A spectrum display provides the >> missing insight. >> > > Wow. Does it show you the improvement from cryogenically treated, > oxygen-free speaker cables? > > Roy Lewallen, W7EL Article: 96043 of rec.radio.amateur.homebrew From: budgie Subject: Re: glass-mount omnidirectional antenna? Date: Wed, 11 Jan 2006 13:37:18 +0800 Message-ID: References: <1136950193.497960.83860@g47g2000cwa.googlegroups.com> On 10 Jan 2006 20:01:17 -0800, "kevincw01" wrote: >I used to have a in-car cell phone system and it had a glass-mount >antenna which didn't require drilling. Basically, there was >coax(conntected to the cell) to a plate that stuck to the inside of the >rear window. Then on the outside of that window was another plate with >the antenna attached to it. You can buy these a radio shack I noticed. > I've also seem the same done for XM/Sirius Satellite radio. > >I have searched and searched and so far have not found the same thing >for 2.4 ghz wifi. Does anyone know where I can find one? If not, >could it be as simple as removing the cell antenna from the exterior >plate(of the radio shack cellular version) and reattaching a 2.4 ghz >omni? Or maybe I could modify the existing cell antenna to the correct >1/2 wavelength of 2.4ghz? Haven't seen a 2.4G unit, which doesn't mean they aren't out there. But the through-glass coupling is fairly narrowband and incorporates tuning elements. The 800/900 MHz units would present a shocking SWR at 2.4G. Article: 96044 of rec.radio.amateur.homebrew Message-ID: <43C49A6F.5366A0D7@mail.asb.com> From: Neil Kurzman Subject: Re: Inexpensive Digital Strip Chart Recorder References: <1136941627.419160.149340@o13g2000cwo.googlegroups.com> Date: Wed, 11 Jan 2006 05:46:05 GMT Too_Many_Tools wrote: > I am looking for an inexpensive digital strip chart recorder. > > Does something like this exist? > > Are there addons for a laptop, pda or pocket pc that allows one to > record, store and display analog data similar to the good old chart > recorder? > > Thanks for any leads. > > TMT Sure Look For Data loggers. DataQ makes some cheap ones www.DataQ.com Article: 96045 of rec.radio.amateur.homebrew From: "Frithiof Andreas Jensen" Subject: Re: Inexpensive Digital Strip Chart Recorder Date: Wed, 11 Jan 2006 09:33:24 +0100 Message-ID: References: <1136941627.419160.149340@o13g2000cwo.googlegroups.com> "Too_Many_Tools" wrote in message news:1136941627.419160.149340@o13g2000cwo.googlegroups.com... > I am looking for an inexpensive digital strip chart recorder. > > Does something like this exist? > > Are there addons for a laptop, pda or pocket pc that allows one to > record, store and display analog data similar to the good old chart > recorder? "Round Robin Database Tool" - RRDTool - can possibly be hacked into submission: http://people.ee.ethz.ch/~oetiker/webtools/rrdtool/ > Article: 96046 of rec.radio.amateur.homebrew From: "Paul VK3DIP" References: Subject: Re: Identifying a mystery diode Message-ID: Date: Wed, 11 Jan 2006 09:34:48 GMT John A, Spot on we have reverse breakdown at around 15 to 20 volts dependant on current, this is obviously not a high voltage diode!!! By the way yes the cross bar is the cathode. All the (known) varactors I have measure a vf around the 0.6-0.7 volt and so do the PIN's I have, though I don't have a really extensive collection of either, this is why I had ruled them out but if you know of other examples then its sounding good. So so far we know: Forward Voltage ~ 1.4 -1.5 V Reverse Voltage Breakdown ~ 15-20V No Visible or IR light emitted. Small Signal RF like packaging with cross bar indicating cathode. So what is left?, 2 series 10V Zeners? I may have to break one open and get out a microscope yet. Paul. "John A" wrote in message news:dpj2vc$i4p$1@newsg3.svr.pol.co.uk... > Hi Paul, > > That sort of "mini-L" packaging is often used for vhf components, e.g. > tuning diodes, hot carrier diodes and PIN diodes - and some of these have > forward volt-drops of more than one volt. > > You can investigate that suggestion that it is a high-voltage rectifier by > applying, say, 200v reverse voltage via a 1Mohm resistor and measuring the > breakdown (if any) voltage of the diode, or what current flows. Any of the > other suggestions - including mine - will break down. > > Are there definitely no markings? > > > John A > "Paul VK3DIP" wrote in message > news:cXjtf.136133$V7.93540@news-server.bigpond.net.au... >> Hi all I recently purchased a bag of unmarked supposedly diodes and I am >> trying to figure out what they are. The clues so far are normal diode >> action on a multimeter (ie conducts one way but not the other) but the >> forward voltage is high at about 1.4 - 1.5 volts. The packaging is a > small >> square black plastic box with flat axial leads one of which has a small >> cross >> piece on it. This packaging suggests small signal or at least low power. >> >> If anyone wants to look at the mystery diode it is the top one >> in this picture. >> http://www.users.bigpond.com/pmcmahon/mysterydiode.jpg >> The bottom one is a normal glass 1N914 just for scale. >> >> There is nowhere for the light to come out (or in) so they are not LEDs >> which is the only other diode like component I have come across with that >> high a forward voltage. Could it be two silicon diodes in series? >> >> Any suggestions or even just identifying the case outline would be >> appreciated. >> >> Thanks >> Paul VK3DIP >> >> >> > > Article: 96047 of rec.radio.amateur.homebrew From: Winfield Hill Subject: Re: Zener Noise (was: 1N4007 varactors) Date: 11 Jan 2006 01:48:16 -0800 Message-ID: References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> JeffM wrote... > >>...the famous zener oscillation thread a few years back >>...my ASCII waveform plots of actual bench measurements >>showing exactly what's going on. >> Winfield Hill > >http://groups.google.com/group/sci.electronics.design/browse_frm/thread/399b6a0bf6cfa4f5/16aa533d72a79d11?q=microplasma+zener+Oscillation&fwc=1 That's one thread, perhaps the first in a series. That thread doesn't have the waveforms I was referring to (although there are some waveforms in posts 51 and 66). Tony, Bill, Roy and I, and some others here wasted masses of time on this subject over a period of a few months, eight and a half years ago. We took bench measurements, did calculations, found the scientific literature (it was a subject that occupied physicists in the late 50s, see posts 72-76), and we did plenty of speculation. -- Thanks, - Win Article: 96048 of rec.radio.amateur.homebrew From: "Ian" Subject: Re: Doppler Radar Date: Wed, 11 Jan 2006 11:04:46 -0000 Message-ID: <1136976587.211250@newsreg.cos.agilent.com> References: <23e07$43c044e8$4251d54c$3390@DIALUPUSA.NET> <43C124D6.3080004@nospam.com> <43c1d7fb$0$501$a726171b@news.hal-pc.org> <3602b$43c1e206$42513109$23602@DIALUPUSA.NET> <4cv4s1h2tusoukac1mq2vea7va0c3aciu3@4ax.com> <42ff9iF1irg5vU1@individual.net> <1h45s1htokfokma462vsi864j086s3sqnf@4ax.com> <1136903656.80601@newsreg.cos.agilent.com> <97k7s1lg82b4b349paksibsdb68uab9lre@4ax.com> <5do7s1tf2t4q8i622q5v6hs3ta04ftani1@4ax.com> "Spehro Pefhany" wrote in message news:5do7s1tf2t4q8i622q5v6hs3ta04ftani1@4ax.com... > > Try pasting this into the search bar: > > 33 30 11.57N 111 55 46.22W > > > > Best regards, > Spehro Pefhany Thanks, Spehro, I'll try that tonight (Google Earth doesn't like my ancient graphics card at work). Regards Ian Article: 96049 of rec.radio.amateur.homebrew From: budgie Subject: Re: glass-mount omnidirectional antenna? Date: Wed, 11 Jan 2006 19:06:31 +0800 Message-ID: References: <1136950193.497960.83860@g47g2000cwa.googlegroups.com> <1136966235.241155.285760@z14g2000cwz.googlegroups.com> On 10 Jan 2006 23:57:15 -0800, "kevincw01" wrote: >sorry to have to ask but what is SWR? My guess is sound to [somthing] >ratio? Standing wave ratio. It is a measure of how well (in this case) the antenna system accepts the energy sent to it up the transmission line and radiates it, compared to reflecting it back to the source transmitter. The transmission line should be 50 ohm coax in your case. If the tranmission line/system has serious impedance variation or discontinuity, power is reflected back to the source rather than passing along the line. As the through-glass coupling system employs frequency-sensitive tuned circuit elements, a substantial change in frequency as you suggest will certainly create a serious impedance discontinuity. Overall transmission efficiency pooter<-> antenna would be very poor as a result. You may well find that a decent 2.4G antenna on the pooter inside the vehicle is more efficient. Article: 96050 of rec.radio.amateur.homebrew From: Winfield Hill Subject: Re: Doppler Radar Date: 11 Jan 2006 03:27:55 -0800 Message-ID: References: <23e07$43c044e8$4251d54c$3390@DIALUPUSA.NET> <43C124D6.3080004@nospam.com> <43c1d7fb$0$501$a726171b@news.hal-pc.org> <3602b$43c1e206$42513109$23602@DIALUPUSA.NET> <4cv4s1h2tusoukac1mq2vea7va0c3aciu3@4ax.com> <42ff9iF1irg5vU1@individual.net> <1h45s1htokfokma462vsi864j086s3sqnf@4ax.com> <1136903656.80601@newsreg.cos.agilent.com> <97k7s1lg82b4b349paksibsdb68uab9lre@4ax.com> <5do7s1tf2t4q8i622q5v6hs3ta04ftani1@4ax.com> Spehro Pefhany wrote... > > Try pasting this into the search bar: > 33 30 11.57N 111 55 46.22W Try this one in Hybrid mode, Google has you driving off an unfinished bridge, 42.370831,-71.066555 :-) -- Thanks, - Win Article: 96051 of rec.radio.amateur.homebrew From: Winfield Hill Subject: Re: Zener Noise (was: 1N4007 varactors) Date: 11 Jan 2006 05:57:01 -0800 Message-ID: References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> Winfield Hill wrote... > > JeffM wrote... >> >> Winfield Hill wrote... >>> >>>...the famous zener oscillation thread a few years back >>>...my ASCII waveform plots of actual bench measurements >>> showing exactly what's going on. >> >>http://groups.google.com/group/sci.electronics.design/browse_frm/thread/399b6a0bf6cfa4f5/16aa533d72a79d11?q=microplasma+zener+Oscillation&fwc=1 > > That's one thread, perhaps the first in a series. That thread > doesn't have the waveforms I was referring to (although there > are some waveforms in posts 51 and 66). Tony, Bill, Roy and I, > and some others here wasted masses of time on this subject over > a period of a few months, eight and a half years ago. We took > bench measurements, did calculations, found the scientific > literature (it was a subject that occupied physicists in the > late 50s, see posts 72-76), and we did plenty of speculation. All of which led Roy McCammon to remark (post 90), "I'd have to say that it is the best thread this year." He said that Aug 5th, after 3 weeks of posts, and yet the followup threads in Aug and Sept on the same topic were just as long, and perhaps even more interesting. Ah, those were that days! -- Thanks, - Win Article: 96052 of rec.radio.amateur.homebrew From: "Heytubeguy" Subject: FA: Globe 46+ air variables+stuff Message-ID: Date: Wed, 11 Jan 2006 14:33:42 GMT Original GLOBE type 46 that tested very strong + many other air variables at: http://search.ebay.com/_W0QQfgtpZ1QQfrppZ25QQsassZheytubeguy tnx heytubeguy Article: 96053 of rec.radio.amateur.homebrew From: Al Subject: Re: Inexpensive Digital Strip Chart Recorder References: <1136941627.419160.149340@o13g2000cwo.googlegroups.com> Message-ID: Date: Wed, 11 Jan 2006 15:00:07 GMT In article <1136941627.419160.149340@o13g2000cwo.googlegroups.com>, "Too_Many_Tools" wrote: > I am looking for an inexpensive digital strip chart recorder. > > Does something like this exist? > > Are there addons for a laptop, pda or pocket pc that allows one to > record, store and display analog data similar to the good old chart > recorder? > > Thanks for any leads. > > TMT > http://www.lascarelectronics.com/promo.cfm?CFID=18736453&CFTOKEN=20840100 Independent datalogger that is connected to your computer via USB. Program it and download data from it. About 99 bucks. Al Article: 96054 of rec.radio.amateur.homebrew From: "Asimov" Subject: Re: 1N4007 varactors Message-ID: References: Date: Wed, 11 Jan 2006 15:01:32 GMT "John Popelish" bravely wrote to "All" (10 Jan 06 22:14:12) --- on the heady topic of "Re: 1N4007 varactors" JP> From: John Popelish JP> Xref: core-easynews rec.radio.amateur.homebrew:90859 JP> Steve Nosko wrote: JP> (snip) > Don't (some) zeners generate noise???...or is that only near the breakdown > reigion? JP> I think that whether noisy or not, the noise generation mechanism JP> kicks in, only when the zeners are reverse conducting via the zener JP> breakdown process, so if you keep the voltage well below the zener JP> knee, say, half of that, they are not particularly noisy compared to JP> other diodes. So, yes, only near the breakdown region, especially JP> just below the rated voltage (low reverse current). I never tested a zener when used as varactor but I think these have a much greater reverse saturation current (even far below breakdown threshold) and it is this that might cause comparatively more noise than a conventional diode with a tiny leakage current. Well, at least that is what the junction noise equations would seem to indicate. A*s*i*m*o*v Article: 96055 of rec.radio.amateur.homebrew From: Steve Subject: Re: Inexpensive Digital Strip Chart Recorder Message-ID: References: <1136941627.419160.149340@o13g2000cwo.googlegroups.com> <1136974052.420323.117030@g43g2000cwa.googlegroups.com> <1136981880.915087.20540@o13g2000cwo.googlegroups.com> Date: Wed, 11 Jan 2006 10:07:40 -0500 Omega OM-EL-USB USB data logger, stand-alone, temperature, temp/RH, voltage, or current, about $60 http://www.omega.com/ppt/pptsc.asp?ref=OM-EL-USB-1 OM-PL series, $115 with more options Article: 96056 of rec.radio.amateur.homebrew Subject: Re: LMX2322? From: JE References: <5da6a$43c1fbbd$d135c4af$24772@MDI.CA> Message-ID: Date: Wed, 11 Jan 2006 10:42:31 -0500 Another great idea thanks.Lots to choice from NEC. Why don't US companies make prescalers? Where do I get this free C/C++ compiler and which Atmel chips do you recommend to start? JE Article: 96057 of rec.radio.amateur.homebrew From: "Mike Young" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> Subject: Re: Doppler Radar Message-ID: Date: Wed, 11 Jan 2006 16:30:17 GMT "Rich Grise, but drunk" wrote in message news:pan.2006.01.09.22.31.32.308051@example.net... > Get a piece of baling wire, and tie two garbage cans together, one on > either side of the alleyway, with the wire about 18" (1/2M) off the > ground. > > That should slow the little bastards down! >:-> Yeah, it would. You should see what pranks like that do to motorcyclists. Article: 96058 of rec.radio.amateur.homebrew From: Hans-Bernhard Broeker Subject: Re: Inexpensive Digital Strip Chart Recorder Date: 11 Jan 2006 16:37:27 GMT Message-ID: <42kqi7F1hi7q1U1@news.dfncis.de> References: <1136941627.419160.149340@o13g2000cwo.googlegroups.com> <1136944051.369424.311940@z14g2000cwz.googlegroups.com> [Note: F'up2 cut down --- should have been done by OP!] In comp.arch.embedded Too_Many_Tools wrote: > I would agree...I am surprised that in today's world of electronics > that an inexpensive turnkey appliance is not available. While a paper strip recorder might have seemed a good idea back in its day, actually using one in this day and age would be a rather obvious waste of paper. The kind of device you're looking for is called a storage oscilloscope or data logger, these days, mostly depending on its typical sampling rate and number of channels. Any computer or PDA with decent sound hardware should suffice for a working, no-cost, software-only approach. Just connect your analog input to line-in (adapt level and impedance as needed), and record your signal as an audio stream, which you can later transform into whatever kind of plot or display you like. It won't be spectacularly accurate, granted, but it'll still outperform a paper strip plotter on all practical counts. -- Hans-Bernhard Broeker (broeker@physik.rwth-aachen.de) Even if all the snow were burnt, ashes would remain. Article: 96059 of rec.radio.amateur.homebrew From: "AAA RF Products" Subject: RF Connectors, Adapters & Cable Assemblies Message-ID: Date: Wed, 11 Jan 2006 09:48:40 -0800 For your free copy of our new catalog, please email sales@AAARFProducts.com or see www.aaarfproducts.com or call 949 481 3154 (San Clemente, CA, USA) No minimum order. No handling charges Article: 96060 of rec.radio.amateur.homebrew From: "RST Engineering" References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> Subject: Re: Zener Noise (was: 1N4007 varactors) Date: Wed, 11 Jan 2006 10:08:19 -0800 Message-ID: OK, then. A zener makes a poor noise source according to what I'm reading. Noise.com used to sell off-spec diodes by the onesies for we poor peons to play with, but for whatever reason that doesn't seem to be the case any more. Given that a zener (at whatever current) is a poor noise source, what is a good source of electronic broadband noise from low HF through high UHF -- say, 5 to 500 MHz.? (No smart remarks about spark gaps.) Jim "Winfield Hill" wrote in message news:dq2k900109@drn.newsguy.com... We took > bench measurements, did calculations, found the scientific > literature (it was a subject that occupied physicists in the > late 50s, see posts 72-76), and we did plenty of speculation. Article: 96061 of rec.radio.amateur.homebrew From: John Larkin Subject: Re: Zener Noise (was: 1N4007 varactors) Date: Wed, 11 Jan 2006 10:39:29 -0800 Message-ID: References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> On Wed, 11 Jan 2006 10:08:19 -0800, "RST Engineering" wrote: >OK, then. A zener makes a poor noise source according to what I'm reading. >Noise.com used to sell off-spec diodes by the onesies for we poor peons to >play with, but for whatever reason that doesn't seem to be the case any >more. > >Given that a zener (at whatever current) is a poor noise source, what is a >good source of electronic broadband noise from low HF through high UHF -- >say, 5 to 500 MHz.? (No smart remarks about spark gaps.) > >Jim > A hot resistor. How about a thermistor or a lamp filament that was 50 ohms at some high temperature. You could heat it with DC, sense its resistance/temp, and let it make noise, all in a single part. Old vintage noise figure meters used gas tubes. And I think there was a pencil tube that mounted in a waveguide and made shot noise. And, of course, the old photomultiplier trick. John Article: 96062 of rec.radio.amateur.homebrew From: "RST Engineering \(jw\)" References: <11s84epqccvti43@corp.supernews.com> <8e44$43c43569$42513d75$6585@DIALUPUSA.NET> <0vj8s1p1ef4sroo1q2pe6klvqvpps0mmm6@4ax.com> <1137004874.426229.102480@g14g2000cwa.googlegroups.com> Subject: Re: Zener Noise (was: 1N4007 varactors) Date: Wed, 11 Jan 2006 10:47:03 -0800 Message-ID: Immediately you say "choke" you have modified and peaked the bandwidth. I'll buy that you can feed it with a resistor for broadband, but in my humble opinion the construction of a grain of wheat bulb won't get up into the UHF region with noise. Do you have any idea of the output level of this circuit? Jim "Mark" wrote in message news:1137004874.426229.102480@g14g2000cwa.googlegroups.com... >I have seen a small "gain of wheat" type light bulb used as a noise > source... > > Feed it with DC through a choke and AC couple the noise out .... > > and you can vary it too!! > > Mark > Article: 96063 of rec.radio.amateur.homebrew From: Phil Hobbs Subject: Re: Zener Noise Date: Wed, 11 Jan 2006 14:10:32 -0500 Message-ID: <43C55828.4010005@SpamMeSenseless.pergamos.net> References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> John Larkin wrote: > On Wed, 11 Jan 2006 10:08:19 -0800, "RST Engineering" > wrote: > A hot resistor. > > How about a thermistor or a lamp filament that was 50 ohms at some > high temperature. You could heat it with DC, sense its > resistance/temp, and let it make noise, all in a single part. > > Old vintage noise figure meters used gas tubes. And I think there was > a pencil tube that mounted in a waveguide and made shot noise. > > And, of course, the old photomultiplier trick. I still like the flashlight/photodiode trick. You can get a really good calibration just from the dc, and can calibrate the frequency response with a spark plug. Cheers, Phil Hobbs Article: 96065 of rec.radio.amateur.homebrew From: "Bill Turner" Subject: Re: Zener Noise Date: Wed, 11 Jan 2006 12:05:24 -0800 Message-ID: References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> <43C55828.4010005@SpamMeSenseless.pergamos.net> ORIGINAL MESSAGE: "Phil Hobbs" >and can calibrate the frequency response with a spark plug. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I generally use a pipe wrench, but I'll try anything once. Bill, W6WRT Article: 96066 of rec.radio.amateur.homebrew From: "Tim Williams" References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> Subject: Re: Zener Noise (was: 1N4007 varactors) Message-ID: Date: Wed, 11 Jan 2006 14:53:07 -0600 "John Larkin" wrote in message news:otjas1po49cb2t8jo1jm06ja6jepfd9vsg@4ax.com... > Old vintage noise figure meters used gas tubes. And I think there was > a pencil tube that mounted in a waveguide and made shot noise. I've got a gaussian noise generator, some SS in the power supply, tubes everywhere else, found it on the curb and apparently works. Uses a pair of 6D4 thyratrons in magnetic fields for the noise. Tim -- Deep Fryer: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms Article: 96067 of rec.radio.amateur.homebrew From: John Larkin Subject: Re: Zener Noise (was: 1N4007 varactors) Date: Wed, 11 Jan 2006 13:20:53 -0800 Message-ID: References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> On Wed, 11 Jan 2006 14:53:07 -0600, "Tim Williams" wrote: >"John Larkin" wrote in message >news:otjas1po49cb2t8jo1jm06ja6jepfd9vsg@4ax.com... >> Old vintage noise figure meters used gas tubes. And I think there was >> a pencil tube that mounted in a waveguide and made shot noise. > >I've got a gaussian noise generator, some SS in the power supply, tubes >everywhere else, found it on the curb and apparently works. Uses a pair of >6D4 thyratrons in magnetic fields for the noise. > >Tim GR? John Article: 96068 of rec.radio.amateur.homebrew From: John Larkin Subject: Re: Zener Noise Date: Wed, 11 Jan 2006 13:34:10 -0800 Message-ID: References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> <43C55828.4010005@SpamMeSenseless.pergamos.net> On Wed, 11 Jan 2006 14:10:32 -0500, Phil Hobbs wrote: >John Larkin wrote: >> On Wed, 11 Jan 2006 10:08:19 -0800, "RST Engineering" >> wrote: > >> A hot resistor. >> >> How about a thermistor or a lamp filament that was 50 ohms at some >> high temperature. You could heat it with DC, sense its >> resistance/temp, and let it make noise, all in a single part. >> >> Old vintage noise figure meters used gas tubes. And I think there was >> a pencil tube that mounted in a waveguide and made shot noise. >> >> And, of course, the old photomultiplier trick. > >I still like the flashlight/photodiode trick. You can get a really good >calibration just from the dc, and can calibrate the frequency response >with a spark plug. > >Cheers, > >Phil Hobbs What's the light-flash waveform look like from a spark plug? What do you drive it with? Don't you have gobs of femtosecond lasers around your place? John Article: 96069 of rec.radio.amateur.homebrew From: Rich Grise Subject: Re: Doppler Radar Message-ID: References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> Date: Wed, 11 Jan 2006 22:02:07 GMT On Wed, 11 Jan 2006 16:30:17 +0000, Mike Young wrote: > "Rich Grise, but drunk" wrote in message > news:pan.2006.01.09.22.31.32.308051@example.net... >> Get a piece of baling wire, and tie two garbage cans together, one on >> either side of the alleyway, with the wire about 18" (1/2M) off the >> ground. >> >> That should slow the little bastards down! >:-> > > Yeah, it would. You should see what pranks like that do to motorcyclists. But, on your motorcycle, you wouldn't go racing down an alley like that. At least I know _I_ wouldn't! I drive kinda like this guy: http://www.abiengr.com/~sysop/images/Safe-Car.gif ;-) Cheers! Rich Article: 96070 of rec.radio.amateur.homebrew From: "Samuel Hunt" Subject: Ceramic filters for FM.... Date: Wed, 11 Jan 2006 22:51:10 +0000 (UTC) Message-ID: Daft question time again. I've got some ceramic filters in some radios that are too wide. First: I've got a repeater with a 455khz IF filter that's the 3 pin type, marked "55F" and "CM". It's in a FX5000 reciever. Second: I've got some mobiles with the larger filters, marked LT455FW. I want to put these all onto a nice and tight filter. The problem is that I'm trying to use 145.625, but there's two repeaters on 145.6125 and 145.6375 locally, so a frequency shift won't do anything. Deviation is 2.5khz peak 1: What sort of bandwidth do people recommend? I have been told that 9khz would work a treat, but I don't know if I should go narrower or wider? 2: I've found this site: http://www.euroquartz.co.uk/ceramic-filt.htm What are all the filter types, what do they mean (like the LTW33, LTS, etc, etc), and which models would be suitable substitutes? Look forward to people's responses, because this is confusing me now! Sam M1FJB Article: 96071 of rec.radio.amateur.homebrew From: "Tim Williams" References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> Subject: Re: Zener Noise (was: 1N4007 varactors) Message-ID: Date: Wed, 11 Jan 2006 17:00:09 -0600 "John Larkin" wrote in message news:dltas15ph0vs59kn482bpvmipn7ece7okd@4ax.com... > >I've got a gaussian noise generator, ... > > GR? Come again? Tim -- Deep Fryer: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms Article: 96072 of rec.radio.amateur.homebrew From: "Mike Andrews" Subject: Re: Zener Noise Date: Wed, 11 Jan 2006 23:47:37 +0000 (UTC) Message-ID: References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> In rec.radio.amateur.homebrew Tim Williams wrote: > "John Larkin" wrote in message > news:dltas15ph0vs59kn482bpvmipn7ece7okd@4ax.com... >> >I've got a gaussian noise generator, ... >> >> GR? > Come again? When I see "GR", I think "General Radio", and salivate gently. They made some really, really nice test gear. -- Mike Andrews, W5EGO mikea@mikea.ath.cx Tired old sysadmin Article: 96073 of rec.radio.amateur.homebrew From: Jim Thompson Subject: Re: Zener Noise Message-ID: <1e7bs1h4v8actq0lsb7u67mr0ksnjf09jg@4ax.com> References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> Date: Wed, 11 Jan 2006 17:11:52 -0700 On Wed, 11 Jan 2006 23:47:37 +0000 (UTC), "Mike Andrews" wrote: >In rec.radio.amateur.homebrew Tim Williams wrote: >> "John Larkin" wrote in message >> news:dltas15ph0vs59kn482bpvmipn7ece7okd@4ax.com... >>> >I've got a gaussian noise generator, ... >>> >>> GR? > >> Come again? > >When I see "GR", I think "General Radio", and salivate gently. They >made some really, really nice test gear. And then let themselves get sucked, by marketing, into large mainframe-based testers, and lost their ass. I watched the money-making portable test division in Phoenix get trashed by the shit-heads in Massachusetts... now you know _part_ of the source of my animosity toward Massa2shits ;-) ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. Article: 96074 of rec.radio.amateur.homebrew From: "RST Engineering" References: <11s84epqccvti43@corp.supernews.com> <8e44$43c43569$42513d75$6585@DIALUPUSA.NET> <0vj8s1p1ef4sroo1q2pe6klvqvpps0mmm6@4ax.com> <1137004874.426229.102480@g14g2000cwa.googlegroups.com> Subject: Re: Zener Noise (was: 1N4007 varactors) Date: Wed, 11 Jan 2006 16:29:06 -0800 Message-ID: I've used noisecom for some years, but they are hard to buy in onesie-twosies and are rather expensive in quantity when you only need one. They USED to sell seconds that didn't meet spec, but I don't see that offer on their current website. Jim "Clark" wrote in message news:TqOdnY6i8PKGGFjeRVn-gw@comcast.com... > Try this > http://www.noisecom.com/ Article: 96075 of rec.radio.amateur.homebrew From: John Larkin Subject: Re: Zener Noise (was: 1N4007 varactors) Date: Wed, 11 Jan 2006 16:30:23 -0800 Message-ID: <608bs1lm6onekfegn9d83q4e6s956je19h@4ax.com> References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> On Wed, 11 Jan 2006 17:00:09 -0600, "Tim Williams" wrote: >"John Larkin" wrote in message >news:dltas15ph0vs59kn482bpvmipn7ece7okd@4ax.com... >> >I've got a gaussian noise generator, ... >> >> GR? > >Come again? > >Tim Is it a General Radio noise generator? I have an old GR noise generator, and the manual talks about moving the magnet around to optimize something. John Article: 96076 of rec.radio.amateur.homebrew From: "Steve Nosko" Subject: Re: Zener Noise Date: Wed, 11 Jan 2006 17:58:56 -0600 Message-ID: References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> <43C55828.4010005@SpamMeSenseless.pergamos.net> Nice touch, Bill. 73, Steve, K9DCI "Bill Turner" wrote in message news:dq3oe5018rb@enews3.newsguy.com... > ORIGINAL MESSAGE: > > > "Phil Hobbs" > > >and can calibrate the frequency response with a spark plug. > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > I generally use a pipe wrench, but I'll try anything once. > > Bill, W6WRT > > Article: 96077 of rec.radio.amateur.homebrew From: Gerhard Hoffmann Subject: Re: Zener Noise (was: 1N4007 varactors) Date: Thu, 12 Jan 2006 01:56:44 +0100 Message-ID: <3v8bs1ple47a8khl6157asp006k47of6fa@4ax.com> References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> On Wed, 11 Jan 2006 10:08:19 -0800, "RST Engineering" wrote: >OK, then. A zener makes a poor noise source according to what I'm reading. >Noise.com used to sell off-spec diodes by the onesies for we poor peons to >play with, but for whatever reason that doesn't seem to be the case any >more. > >Given that a zener (at whatever current) is a poor noise source, what is a >good source of electronic broadband noise from low HF through high UHF -- >say, 5 to 500 MHz.? (No smart remarks about spark gaps.) We had this already yesterday in '97 and '98. The internet does not forget anything, so watch your mouth :-) But, my final solution was to buy an Agilent 346c. regards, Gerhard Article: 96078 of rec.radio.amateur.homebrew From: Winfield Hill Subject: Re: Zener Noise Date: 11 Jan 2006 17:52:16 -0800 Message-ID: References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> <1e7bs1h4v8actq0lsb7u67mr0ksnjf09jg@4ax.com> Jim Thompson wrote... > > I watched the money-making portable test division in Phoenix > get trashed by the shit-heads in Massachusetts... now you know > _part_ of the source of my animosity toward Massa2shits ;-) That's an amazing extension. Plenty of healthy Massachusetts companies have been sucked dry by their out-of-state owners. Obviously the ability to mis-manage a company from a distance is not notably a Massachusetts sin, unless you're obsessed with the Harvard Business School's modest influence on the issue. -- Thanks, - Win Article: 96079 of rec.radio.amateur.homebrew From: "keith skelton" References: <1136619271.789630.294240@z14g2000cwz.googlegroups.com> Subject: Re: Welcome To Ham Radio! (And Don't Get Misled By CBERS!) - A FAQ. Message-ID: Date: Thu, 12 Jan 2006 03:00:24 GMT These CB types engage in the competitive activities with their Cheque-Book-purchased off-the-shelf radios in a forlorn effort to prove that they are Radio Hams. No _REAL_ Radio Hams are deceived by such people! Yasue, Trio, kenwood, Icom, etc bring back steam, moustoches, nylon Y fronts, (of course you you have to wash them once a week) braces, and of course go around hating people and create a class war, lets try and see the bad in everything, Article: 96080 of rec.radio.amateur.homebrew From: "Tim Williams" References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> Subject: Re: Zener Noise Message-ID: Date: Wed, 11 Jan 2006 21:03:29 -0600 "Mike Andrews" wrote in message news:dq45ep$pdn$3@puck.litech.org... > >> >I've got a gaussian noise generator, ... > >> > >> GR? > > When I see "GR", I think "General Radio", and salivate gently. They > made some really, really nice test gear. Ah, had a feeling it was something about a manufacturer... Unfortunately(?) no, it appears to be Elgenco, and I also now remember not finding much info on this device after I picked it up. It's a rack mount unit BTW. Tim -- Deep Fryer: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms Article: 96081 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: Identifying a mystery diode Date: Wed, 11 Jan 2006 19:05:27 -0800 Message-ID: <11sbhropp35fb24@corp.supernews.com> References: I doubt that it's two series zeners, since it's no trick to make a single zener with that breakdown voltage. The only application I know of for series connected diodes with that sort of breakdown voltage is for high dynamic range mixers. But the pairs I've seen in a single package have a third pin at the junction so you can also use them for other applications. I wonder if it might be a low-C varactor. The very low C ones might possibly consist of two diodes in series -- the manufacturers don't give any clues since they don't publish any data on the forward bias characteristics. The breakdown voltage of low C varactors is in that ballpark, and the packaging is consistent with that possibility. Roy Lewallen, W7EL Paul VK3DIP wrote: > John A, > Spot on we have reverse breakdown at around 15 to 20 volts dependant on > current, this is obviously not a high voltage diode!!! > By the way yes the cross bar is the cathode. All the (known) varactors I > have measure a vf around the 0.6-0.7 volt and so do the PIN's I have, though > I don't have a really extensive collection of either, this is why I had > ruled them out but if you know of other examples then its sounding good. > > So so far we know: > Forward Voltage ~ 1.4 -1.5 V > Reverse Voltage Breakdown ~ 15-20V > No Visible or IR light emitted. > Small Signal RF like packaging with cross bar indicating cathode. > > So what is left?, 2 series 10V Zeners? > > I may have to break one open and get out a microscope yet. > > Paul. Article: 96082 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: Zener Noise Date: Wed, 11 Jan 2006 19:08:59 -0800 Message-ID: <11sbi2d3rmfe9b2@corp.supernews.com> References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> Winfield Hill wrote: > > That's one thread, perhaps the first in a series. That thread > doesn't have the waveforms I was referring to (although there > are some waveforms in posts 51 and 66). Tony, Bill, Roy and I, > and some others here wasted masses of time on this subject over > a period of a few months, eight and a half years ago. . . For the record, that was Roy McCammon, not me. Roy Lewallen, W7EL Article: 96083 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: 1N4007 varactors Date: Wed, 11 Jan 2006 19:14:13 -0800 Message-ID: <11sbic6fctg6t90@corp.supernews.com> References: Asimov wrote: > > I never tested a zener when used as varactor but I think these have a > much greater reverse saturation current (even far below breakdown > threshold) and it is this that might cause comparatively more noise > than a conventional diode with a tiny leakage current. Well, at least > that is what the junction noise equations would seem to indicate. They also have a whale of a lot more capacitance than a conventional diode. So I don't think it's a fair comparison. Roy Lewallen, W7EL Article: 96084 of rec.radio.amateur.homebrew From: John Larkin Subject: Re: Zener Noise Date: Wed, 11 Jan 2006 19:20:09 -0800 Message-ID: <9qhbs1hec1gvlcbjf895hk1jccgj5rj8lq@4ax.com> References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> <1e7bs1h4v8actq0lsb7u67mr0ksnjf09jg@4ax.com> On 11 Jan 2006 17:52:16 -0800, Winfield Hill wrote: >Jim Thompson wrote... >> >> I watched the money-making portable test division in Phoenix >> get trashed by the shit-heads in Massachusetts... now you know >> _part_ of the source of my animosity toward Massa2shits ;-) > > That's an amazing extension. Plenty of healthy Massachusetts > companies have been sucked dry by their out-of-state owners. > Obviously the ability to mis-manage a company from a distance > is not notably a Massachusetts sin, unless you're obsessed with > the Harvard Business School's modest influence on the issue. It is sadly true that many of the old-line Rt 128 companies are gone... DEC, Data General, GR, Sensitive Instruments, Clevite, Transitron, probably others. Have others popped up to take their place? Analog Devices, for sure. John Article: 96085 of rec.radio.amateur.homebrew From: "Asimov" Subject: Re: 1N4007 varactors Message-ID: References: Date: Thu, 12 Jan 2006 05:11:09 GMT "Highland Ham" bravely wrote to "All" (11 Jan 06 09:47:40) --- on the heady topic of "Re: 1N4007 varactors" HH> From: Highland Ham HH> Xref: core-easynews rec.radio.amateur.homebrew:90890 HH> Zener diodes are often used as wide band 'noise generators'for use in HH> an impedance bridge used in conjunction with a receiver. I understand to generate the noise that the zener diodes are operated within their normal breakdown current range. However, as a varactor it isn't desirable to have a breakdown current flow. The only tiny current that flows is a saturation current which is related to setting up the P-N junction boundaries within the semiconductor. M*i*k*e Article: 96086 of rec.radio.amateur.homebrew From: Dr. Anton T. Squeegee Subject: Re: glass-mount omnidirectional antenna? Date: Wed, 11 Jan 2006 22:29:38 -0800 Message-ID: References: <1136950193.497960.83860@g47g2000cwa.googlegroups.com> In article <1136950193.497960.83860@g47g2000cwa.googlegroups.com>, kevincw01@gmail.com says... > I have searched and searched and so far have not found the same thing > for 2.4 ghz wifi. Does anyone know where I can find one? If not, If you're serious about decent peformance, stay away from glass mount antennas for anything other than receive-only. They're worse than useless for transmitting. Trust me, I know this. My employer (WA State Patrol) tried some glass mounts at one time for their undercover cars. Performance was horrible, and other electronics in the car (notably the entertainment radio and the key dinger) basically freaked out every time the transmitter got keyed. Once we changed back to regular through-hole or trunk-lid antennas, the problems disappeared completely. It all has to do with decent grounding. > could it be as simple as removing the cell antenna from the exterior > plate(of the radio shack cellular version) and reattaching a 2.4 ghz > omni? No. The coupling box of any glass-mount antenna contains a frequency-sensitive matching circuit. A circuit designed for cellphone frequencies will not work with WiFi freqs. If you need a mobile WiFi antenna, and you don't want to drill holes, use a magnetic mount. Happy tweaking. -- Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute. (Known to some as Bruce Lane, ARS KC7GR, kyrrin (a/t) bluefeathertech[d=o=t]calm -- www.bluefeathertech.com "If Salvador Dali had owned a computer, would it have been equipped with surreal ports?" Article: 96087 of rec.radio.amateur.homebrew From: Dr. Anton T. Squeegee Subject: Re: glass-mount omnidirectional antenna? Date: Wed, 11 Jan 2006 22:33:28 -0800 Message-ID: References: <1136950193.497960.83860@g47g2000cwa.googlegroups.com> <1136966235.241155.285760@z14g2000cwz.googlegroups.com> In article <1136966235.241155.285760@z14g2000cwz.googlegroups.com>, kevincw01@gmail.com says... > sorry to have to ask but what is SWR? My guess is sound to [somthing] > ratio? Oh dear... Someone didn't pay attention in license class... SWR = Standing Wave Ratio. Put simply, it has to do with how good of a load the antenna presents to the transmitter, and how efficiently it will couple the transmitter's energy to the atmosphere. It needs to be as close to 1:1 as possible. If you're using a wattmeter to measure things, you want to see as low as possible a reading in the 'reflected' mode and as high as possible in the 'forward' mode. Here are some more details. http://www.hamquick.com/tutorial_index.php?id=20 Happy tweaking. -- Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute. (Known to some as Bruce Lane, ARS KC7GR, kyrrin (a/t) bluefeathertech[d=o=t]calm -- www.bluefeathertech.com "If Salvador Dali had owned a computer, would it have been equipped with surreal ports?" Article: 96088 of rec.radio.amateur.homebrew From: "Mike Young" References: <5f129$43c01647$4251d54c$538@DIALUPUSA.NET> Subject: Re: Doppler Radar Message-ID: Date: Thu, 12 Jan 2006 07:23:22 GMT "Rich Grise" wrote in message news:pan.2006.01.11.22.02.24.894998@example.net... > On Wed, 11 Jan 2006 16:30:17 +0000, Mike Young wrote: > >> "Rich Grise, but drunk" wrote in message >> news:pan.2006.01.09.22.31.32.308051@example.net... >>> Get a piece of baling wire, and tie two garbage cans together, one on >>> either side of the alleyway, with the wire about 18" (1/2M) off the >>> ground. >>> >>> That should slow the little bastards down! >:-> >> >> Yeah, it would. You should see what pranks like that do to motorcyclists. > > But, on your motorcycle, you wouldn't go racing down an alley like that. > At least I know _I_ wouldn't! I drive kinda like this guy: > http://www.abiengr.com/~sysop/images/Safe-Car.gif ;-) Even if I did, the prescribed penalties amount to a few dollars, not skin grafts, limbs, and brain tissue. Fun is fun, and talk is talk. But let's not forget that life isn't a cartoon peopled with faceless stunt doubles. Article: 96089 of rec.radio.amateur.homebrew From: budgie Subject: Re: glass-mount omnidirectional antenna? Date: Thu, 12 Jan 2006 15:41:12 +0800 Message-ID: <2t1cs1p0jivuq8m2tist3sfhpsfokcl7nk@4ax.com> References: <1136950193.497960.83860@g47g2000cwa.googlegroups.com> <1136966235.241155.285760@z14g2000cwz.googlegroups.com> On Wed, 11 Jan 2006 22:33:28 -0800, Dr. Anton T. Squeegee wrote: >In article <1136966235.241155.285760@z14g2000cwz.googlegroups.com>, >kevincw01@gmail.com says... > >> sorry to have to ask but what is SWR? My guess is sound to [somthing] >> ratio? > > Oh dear... Someone didn't pay attention in license class... > > SWR = Standing Wave Ratio. Put simply, it has to do with how good >of a load the antenna presents to the transmitter, and how efficiently >it will couple the transmitter's energy to the atmosphere. Nothing to do with coupling the Tx energy to the "atmosphere". Terminating the line in a resistor of the line's charactertistic impedance will present a nice SWR and radiate very little. Article: 96090 of rec.radio.amateur.homebrew From: "Martyn" Subject: Re: Dual jfet Date: Thu, 12 Jan 2006 08:32:35 -0000 Message-ID: References: <11s84kphlachbc4@corp.supernews.com> "Roy Lewallen" wrote in message news:11s84kphlachbc4@corp.supernews.com... > If you match both Idss and Vp, they'll have the same Gm at all currents -- > in theory. > > Roy Lewallen, W7EL > > Steve Nosko wrote: >> Depends on the particular application, but this sounds reasonable. >> However, >> rather than IDss, I'd shoot for what ever bias current they are operated >> at, >> though IDss may work, >> 73, K,9.D;C'I >> >> >> "Ken Scharf" wrote in message >> news:S0Bwf.21079$__4.19198@bignews1.bellsouth.net... >> >>>I'm building a circuit that calls for a dual monolithic >>>jfet. Can I use two discrete jfets that I have matched >>>for IDSS in the circuit? They are in TO92 plastic >>>cases, I can glue the two in contact with each other >>>so they end up at the same temperature. >> >> i have u401 and e402 dual fets, new but unused. any use to you? martyn G0THY Article: 96091 of rec.radio.amateur.homebrew From: "Martyn" Subject: Re: Dual jfet Date: Thu, 12 Jan 2006 08:33:18 -0000 Message-ID: References: <11s84kphlachbc4@corp.supernews.com> "Martyn" wrote in message news:dq5476$1gh$1@news.ox.ac.uk... > > "Roy Lewallen" wrote in message > news:11s84kphlachbc4@corp.supernews.com... >> If you match both Idss and Vp, they'll have the same Gm at all >> currents -- in theory. >> >> Roy Lewallen, W7EL >> >> Steve Nosko wrote: >>> Depends on the particular application, but this sounds reasonable. >>> However, >>> rather than IDss, I'd shoot for what ever bias current they are operated >>> at, >>> though IDss may work, >>> 73, K,9.D;C'I >>> >>> >>> "Ken Scharf" wrote in message >>> news:S0Bwf.21079$__4.19198@bignews1.bellsouth.net... >>> >>>>I'm building a circuit that calls for a dual monolithic >>>>jfet. Can I use two discrete jfets that I have matched >>>>for IDSS in the circuit? They are in TO92 plastic >>>>cases, I can glue the two in contact with each other >>>>so they end up at the same temperature. >>> >>> i have u401 and e402 dual fets, new but unused. > any use to you? > > martyn G0THY > or even Old, but unused. oops Article: 96092 of rec.radio.amateur.homebrew From: "Paul VK3DIP" References: <11sbhropp35fb24@corp.supernews.com> Subject: Re: Identifying a mystery diode Message-ID: Date: Thu, 12 Jan 2006 08:52:51 GMT Ok, Both Roy and John A, have effectively suggested series HC Diodes or Low C Varicaps. John A has found some data for an older Motorola HC diode the MBD502 that shows figures for Vf and VBr that are roughly similar in a roughly similar package. Roy also suggests the possibility of a low capacitance varicap, I suppose the way to tell would be to measure the capacitance verses reverse voltage characteristic. If it was something like a MBD502 then the capacitance would be pretty much constant at a low value, if it is a varicap it could also have a low ish value but should be varying a bit. Any ideas on a simple way to do this, I assume my classic multimeter cap range wouldn't like a DC voltage and a diode across it, and the other simple way I can think of of known L and a GDO seems a bit messy to measure possibly sub 1pf values? By the way just in case anyone else is interested the place I got these from still says on their web site that they have some 82000 more which they are selling for $AUS0.0055 each for 1000 minimum which comes to AUS$5.50 for the 1000 see item 31118 at www.rockby.com.au . Paul VK3DIP "Roy Lewallen" wrote in message news:11sbhropp35fb24@corp.supernews.com... >I doubt that it's two series zeners, since it's no trick to make a single >zener with that breakdown voltage. > > The only application I know of for series connected diodes with that sort > of breakdown voltage is for high dynamic range mixers. But the pairs I've > seen in a single package have a third pin at the junction so you can also > use them for other applications. > > I wonder if it might be a low-C varactor. The very low C ones might > possibly consist of two diodes in series -- the manufacturers don't give > any clues since they don't publish any data on the forward bias > characteristics. The breakdown voltage of low C varactors is in that > ballpark, and the packaging is consistent with that possibility. > > Roy Lewallen, W7EL > Article: 96093 of rec.radio.amateur.homebrew From: "SOMMERGIBILE" Subject: Increase lelectivity by a Q multiplier Date: Thu, 12 Jan 2006 10:46:04 +0100 Message-ID: <43c62622$0$334$5fc30a8@news.tiscali.it> http://web.tiscali.it/am2zy/ Article: 96094 of rec.radio.amateur.homebrew From: "xpyttl" References: <1136950193.497960.83860@g47g2000cwa.googlegroups.com> Subject: Re: glass-mount omnidirectional antenna? Message-ID: Date: Thu, 12 Jan 2006 07:28:13 -0500 "Dr. Anton T. Squeegee" wrote in message news:MPG.1e2f97298eefc47f989777@192.168.42.131... > If you're serious about decent peformance, stay away from glass > mount antennas for anything other than receive-only. They're worse than > useless for transmitting. I think you better stick to the paintings. Anecdotal evidence is worse than no evidence. Just because one manufacturer's antenna was junk doesn't mean they all are. There does seem to be considerable variability in glass mount antennas, though. Some people report good results, others horrible, and little in the middle. Still, at 2.4G I'd personally be a bit suspicious of glass mount. However, OP has another problem. Nobody has mentioned feedline loss. The wire carrying the signal to the antenna, even with a good SWR, can be a real source of loss, especially at 2.4G. Cable which has a low loss at that frequency is available, but it is expensive and hard to get. As someone else has suggested, it may be better just to keep the antenna in the vehicle. I would also caution OP, presuming he is in the U.S., there are pretty significant limitations to what he can do legally with WiFi. Besides power limitations, there are a number of other limitations designed to protect other users of that spectrum (including amateurs). WiFi is a tertiary user of that spectrum, and you are REQUIRED not to interfere with the other users. You are also required to accept interference from the primary and secondary users. Now the odds that you will be called on interference either way are pretty small, but recognize that in general modifications, even something as simple as an external antenna, are disallowed by the regulations. .. Article: 96095 of rec.radio.amateur.homebrew From: kensmith@green.rahul.net (Ken Smith) Subject: Re: Zener Noise Date: Thu, 12 Jan 2006 14:49:20 +0000 (UTC) Message-ID: References: In article , Robert Baer wrote: [...] > Wouldn't a zener running in (or near) the (easily seen on curve >tracer) negative resistance mode have lots of noise? There's noise and then there's noise. Any signal we don't want we call noise. A noise source for instumentation needs to have a flat spectrum. The noise on a zener is a good example of the former and poor example of the latter. -- -- kensmith@rahul.net forging knowledge Article: 96096 of rec.radio.amateur.homebrew From: Phil Hobbs Subject: Re: Zener Noise Date: Thu, 12 Jan 2006 10:04:50 -0500 Message-ID: <43C67012.7040508@SpamMeSenseless.pergamos.net> References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> <43C55828.4010005@SpamMeSenseless.pergamos.net> John Larkin wrote: > On Wed, 11 Jan 2006 14:10:32 -0500, Phil Hobbs > wrote: > > >>John Larkin wrote: >> >>>On Wed, 11 Jan 2006 10:08:19 -0800, "RST Engineering" >>> wrote: >> >>>A hot resistor. >>> >>>How about a thermistor or a lamp filament that was 50 ohms at some >>>high temperature. You could heat it with DC, sense its >>>resistance/temp, and let it make noise, all in a single part. >>> >>>Old vintage noise figure meters used gas tubes. And I think there was >>>a pencil tube that mounted in a waveguide and made shot noise. >>> >>>And, of course, the old photomultiplier trick. >> >>I still like the flashlight/photodiode trick. You can get a really good >>calibration just from the dc, and can calibrate the frequency response >>with a spark plug. >> >>Cheers, >> >>Phil Hobbs > > > > What's the light-flash waveform look like from a spark plug? What do > you drive it with? > > Don't you have gobs of femtosecond lasers around your place? > > John > You use one of the circular-gap plugs, run it to a HV supply via a 10M resistor, and just discharge the capacitance of the plug--you get a nice irregular relaxation oscillation. It isn't the absolute most beautiful pulse, but (a) it's easy to shield so you get rid of the pickup, (b) it's surprisingly bright, and (c) the rising edge is way under 1 ns, which should be fine for the VHF to low UHF range. I might stick one on my sampling scope sometime and find out more about its actual performance, but this is a pretty common trick. There are femtosecond lasers around here--my fastest one is about 20 ps, but it's continuously tunable from 420 nm to 10 microns, when it's working. Cheers, Phil Hobbs Article: 96097 of rec.radio.amateur.homebrew From: Allodoxaphobia Subject: Re: Zener Noise Date: 12 Jan 2006 16:04:15 GMT Message-ID: References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> <1e7bs1h4v8actq0lsb7u67mr0ksnjf09jg@4ax.com> <9qhbs1hec1gvlcbjf895hk1jccgj5rj8lq@4ax.com> On Wed, 11 Jan 2006 19:20:09 -0800, John Larkin wrote: > > It is sadly true that many of the old-line Rt 128 companies are > gone... DEC, Data General, GR, Sensitive Instruments, Clevite, > Transitron, probably others. > Have others popped up to take their place? Why sure. Can you red Chinese tech manuals? Article: 96098 of rec.radio.amateur.homebrew From: Winfield Hill Subject: Re: Zener Noise Date: 12 Jan 2006 07:44:35 -0800 Message-ID: References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> <1e7bs1h4v8actq0lsb7u67mr0ksnjf09jg@4ax.com> <9qhbs1hec1gvlcbjf895hk1jccgj5rj8lq@4ax.com> John Larkin wrote... > > Winfield Hill wrote: > >> Jim Thompson wrote... >>> >>> I watched the money-making portable test division in Phoenix >>> get trashed by the shit-heads in Massachusetts... now you know >>> _part_ of the source of my animosity toward Massa2shits ;-) >> >> That's an amazing extension. Plenty of healthy Massachusetts >> companies have been sucked dry by their out-of-state owners. >> Obviously the ability to mis-manage a company from a distance >> is not notably a Massachusetts sin, unless you're obsessed with >> the Harvard Business School's modest influence on the issue. > > It is sadly true that many of the old-line Rt 128 companies are > gone... DEC, Data General, GR, Sensitive Instruments, Clevite, > Transitron, probably others. Have others popped up to take their > place? Analog Devices, for sure. We have scads of large wealthy "newer" high-tech companies headquartered here, that you may not often hear of, like Thermo Electron, Bruker, Summit Technology, EMC, etc., and others you do know, with a substantial presence, like Agilent. Many software and Internet companies are headquartered in MA, like Peoplesoft, Novell, etc., and many others have a large presence, like Sun, Red Hat, IBM, Microsoft, etc. We all know scores of top-tier biotech companies with their headquarters in MA, who have massive high-tech employment here. -- Thanks, - Win Article: 96099 of rec.radio.amateur.homebrew From: "Bill Turner" Subject: JFET for dip meter Date: Thu, 12 Jan 2006 08:22:36 -0800 Message-ID: Ok, so I'm lazy. Does anyone know of an appropriate JFET for a VHF/UHF dip meter? I could spend some time prowling through data sheets, but if anyone knows of a readily available one I'd be appreciative. The usual MPF102 clones don't have high enough frequency capability. Thanks in advance, 73, Bill W6WRT Article: 96100 of rec.radio.amateur.homebrew From: mzenier@eskimo.com (Mark Zenier) Subject: Re: NE602 replacement is NTE7164? Date: Thu, 12 Jan 2006 00:27:44 GMT Message-ID: References: <22a47$43c06c9c$d135c4af$28527@MDI.CA> In article , xpyttl wrote: >"Mark Zenier" wrote in message >news:dpu7h2$ob3$1@eskinews.eskimo.com... > >> No, NE and SA are both Philips prefixes, but different temperature >> ratings. NE is the commercial range of 0 to +70 deg C, SA the >> mil/industrial range of -40 to +85 deg C. > >Since Phillips bought up Signetics, it makes sense they would keep the part >number. And it occurred to me that I have gotten NE602's long after the SA >parts appeared. > >HOWEVER, Phillips lists no NE parts under their RF parts, nor as parts >"similar to" the SA602. Although it is certainly not exhaustive, all the >"NE" parts still in my parts drawer have Signetics logos (no 602's tho - >604/605/614/615 all my 602/612's are SA). Er, Philips has owned Signetics since about 1976. (Along with Mullard and about a half a dozen other regional names which they dropped sometime in the late 80's). In the 1989 Signetics Linear:Communications databook, the NE/SA parts are on the same datasheet. All the demise of the NE602 number says is that Philips has selected their parts catalog to those items that earn the most money. Since a low integration part like the '602 would mostly be used in portable radios or other legacy telcom applications, they probably weren't selling too many of the narrow temp. range. Mark Zenier mzenier@eskimo.com Googleproofaddress(account:mzenier provider:eskimo domain:com) Article: 96101 of rec.radio.amateur.homebrew From: "johan aeq" References: <1137085863.257868.189750@g49g2000cwa.googlegroups.com> Subject: Re: JFET for dip meter Date: Thu, 12 Jan 2006 18:55:09 +0100 Message-ID: <9d504$43c69a3f$52ad139c$14023@news.versatel.nl> try a J310. "Leon" schreef in bericht news:1137085863.257868.189750@g49g2000cwa.googlegroups.com... > Vishay/Telefunken makes several UHF MOSFETs: > > http://www.vishay.com/transistors-rf-af/dual-gate-si-mosfet/ > > 73, Leon > Article: 96102 of rec.radio.amateur.homebrew Subject: Re: LMX2322? From: JE References: <5da6a$43c1fbbd$d135c4af$24772@MDI.CA> Message-ID: <86ce3$43c69dab$d135c4af$14549@MDI.CA> Date: Thu, 12 Jan 2006 13:19:23 -0500 What is the cheapest AVR that will work for me? And is there a programmer you can build or just modify the pic ones? I already know C so should be easy learning. JE Article: 96103 of rec.radio.amateur.homebrew From: Allodoxaphobia Subject: Re: Zener Noise Date: 12 Jan 2006 18:46:48 GMT Message-ID: References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> <1e7bs1h4v8actq0lsb7u67mr0ksnjf09jg@4ax.com> <9qhbs1hec1gvlcbjf895hk1jccgj5rj8lq@4ax.com> On 12 Jan 2006 16:04:15 GMT, Allodoxaphobia wrote: > On Wed, 11 Jan 2006 19:20:09 -0800, John Larkin wrote: >> >> It is sadly true that many of the old-line Rt 128 companies are >> gone... DEC, Data General, GR, Sensitive Instruments, Clevite, >> Transitron, probably others. > >> Have others popped up to take their place? > > Why sure. Can you red Chinese tech manuals? Funny how my Made-In-China keyboard with its @#%^$}# sticky "a" key laid that out. :-\ Article: 96104 of rec.radio.amateur.homebrew From: John Larkin Subject: Re: Zener Noise Date: Thu, 12 Jan 2006 11:05:18 -0800 Message-ID: References: <1136943831.540185.298540@z14g2000cwz.googlegroups.com> <1e7bs1h4v8actq0lsb7u67mr0ksnjf09jg@4ax.com> <9qhbs1hec1gvlcbjf895hk1jccgj5rj8lq@4ax.com> On 12 Jan 2006 07:44:35 -0800, Winfield Hill wrote: > We have scads of large wealthy "newer" high-tech companies > headquartered here, that you may not often hear of, like > Thermo Electron, Bruker, Summit Technology, EMC, etc., and > others you do know, with a substantial presence, like Agilent. > Ah, Bruker, my arch-enemy. I make the gradient drivers and temperature controllers for Varian. I've also had bad experiences with Bruker AXS in Madison. They both seem to be very NIH and very PhD oriented, so they're hard to deal with and especially sell to. John Article: 96105 of rec.radio.amateur.homebrew From: "Steve Nosko" Subject: Re: Ceramic filters for FM.... Date: Thu, 12 Jan 2006 16:29:51 -0600 Message-ID: References: Sam, This is what Engineers must struggle through. Looking at the data sheets I only see size differences in the different types. The electrical specs appear to be the same. When filtering FM you must consider the bandwidth of the transmitted signal which includes the sidebands. Both of your received signals AND the adjacent channel transmitter SIDEBANDS. There needs to be space between the carriers to prevent interference and sidebands from one Tx shouldn't be within the next receiver's bandwidth. Not having my text with me I hope I analyze your numbers correctly. Just remember that FM is wider than just the modulation frequency (according to the Bessel functions). Narrow band FM (B <1) is narrow, but it does have some bandwidth and it is twice the modulation frequency for sure and some at three time. If I do the math correctly, your modulation index is about 2.5 / 3 or .833 (assuming 300-3,000 audio). I always have to think carefully how this ratio goes. Using: http://www.rfcafe.com/references/electrical/bessel.htm This puts us to the left of the B=1 (on the horizontal axis on the bottom) and I see that the first and second sidebands (J1-black & J2-green dotted) are significant, but the third (J3-red dotted) is pretty small, so it may be attenuated in your filter with little resulting distortion. HOWEVER, this sideband IS PRESENT in yours and the other transmitters. This says that the second transmitter sidebands go out to +/- 6Kc AND with the third at +/- 9Kc being pretty small. Now, The sidebands from the other stations do the same (assuming they are modulating correctly). This means that the one above you has sideband energy at its Fc-6kc (second sideband) and some at Fc-9kc (third sideband). Since its carrier is 12.5 kc. above you this puts them at 6.5kc. and 3.5kc. ABOVE your carrier frequency! So, with the filter, you're trying to get rid of a component that is 6.5 Kc. above your carrier, that is the larger one, and one is 3.5kc. above your carrier, that is smaller one. (The others are there, but much, much smaller according to the Bessel curves). The problem here is that you need to RECEIVE sidebands that are 3, 6, and to some extent 9 Kc. above your carrier – from the desired stations. There is a conflict here and it is due to carrier spacing that is too close for FM. You have to look at the filter curves to see which one will provide some attenuation at +/-6.5kc. The trouble is that it must pass +/- 6 Kc! You'll also never get rid of the component at 3.5Kc and still receive your desired second sideband at 6Kc. The other unknown here is the location s of these systems and the stations that will be using them. If someone is far from and using your system, but close to one of the other systems you mention, those sidebands can be much stronger and cause more "splatter" in the eyes of the receiver. Receivers, at least the ones I have been connected with the design of, take this into account and use filters that have all these considerations included in their design and try to keep the bandwidth wide enough to receive what it needs to receive and narrow enough – and with steep enough skirts -- to attenuate adjacent and alternate channel sidebands as much as feasible given economic constraints. There is, however a limit to how close you can put carriers and not get interference *REGARDLESS* of the shape of the filter at ANY expense.. I think you are past that limit. I hope you understand "Kc." I 'm from a time long ago (:-) I find that Hams don't understand the spacing of 2 meter systems and expect to put them on adjacent channels. You can (should) only do this when the systems are far enough apart so this sideband energy is low enough to keep this kind of interference below audible levels. 73, Steve, K,9.D;C'I "Samuel Hunt" wrote in message news:dq424u$deb$1@nwrdmz01.dmz.ncs.ea.ibs-infra.bt.com... > Daft question time again. > > I've got some ceramic filters in some radios that are too wide. > > First: > I've got a repeater with a 455khz IF filter that's the 3 pin type, marked > "55F" and "CM". It's in a FX5000 reciever. > > Second: > I've got some mobiles with the larger filters, marked LT455FW. > > > I want to put these all onto a nice and tight filter. The problem is that > I'm trying to use 145.625, but there's two repeaters on 145.6125 and > 145.6375 locally, so a frequency shift won't do anything. Deviation is > 2.5khz peak > > 1: What sort of bandwidth do people recommend? I have been told that 9khz > would work a treat, but I don't know if I should go narrower or wider? > > 2: I've found this site: http://www.euroquartz.co.uk/ceramic-filt.htm > > What are all the filter types, what do they mean (like the LTW33, LTS, etc, > etc), and which models would be suitable substitutes? > Look forward to people's responses, because this is confusing me now! > Sam, M1FJB Article: 96106 of rec.radio.amateur.homebrew From: "Mike Young" Subject: SMT 40m + 20m qrp Message-ID: <_1Dxf.925$PL5.401@newssvr11.news.prodigy.com> Date: Fri, 13 Jan 2006 01:06:02 GMT I'm sure this has been beaten to death already, but I missed it. Is there a very small SMT QRP kit or design somewhere, maybe on equal to the NorCal 40 or better? I'm aware of the SMK-1. Am looking for the smallest possible rig with 5W and good RX. Would it be reasonable to repackage, say, the NorCal 40 with all surface mount parts? Certainly someone must have already tried this. What results did you find? By way of introduction, I am N9XI. My main rig is a K2, an early first run kit from '99. I think I understand the apparent trepidation surrounding SMT, although I believe it's unfounded and not entirely rational. After all this time, the dearth of very small rigs based on the smaller parts is surprising. (Yell if a quick primer on SMT construction will be useful. I reflow boards in a skillet on the kitchen range.)