Article: 94117 of rec.radio.amateur.homebrew From: John Ferrell Subject: Re: Brag Page Message-ID: References: <8a32d$43057675$4232bd1d$17412@COQUI.NET> Date: Fri, 19 Aug 2005 21:35:39 GMT Yogi Berra said "it ain't bragging if you can do it". You certainly can do it... Thanks for the share. On Fri, 19 Aug 2005 02:04:34 -0400, -ex- wrote: >I finally gathered up my recent homebrew project photos and put them on >a single webpage to show off. You can see it here. Yeah, I'm kinda >proud...this is a great hobby. > >http://www.sparkbench.com/homebrew/homebrew.html > >-Bill M Article: 94118 of rec.radio.amateur.homebrew Date: Fri, 19 Aug 2005 18:05:52 -0400 From: -ex- Subject: Re: Brag Page References: <8a32d$43057675$4232bd1d$17412@COQUI.NET> Message-ID: <60946$430657c2$4232be08$2928@COQUI.NET> Phil Nelson wrote: > Beautiful stuff. You are putting us (well, me anyway) to shame! > > Phil Nelson > > Hey Phil, I did that first Doerle from YOUR website! Tnx, Bill Article: 94119 of rec.radio.amateur.homebrew From: Lou deGonzague Subject: Re: Brag Page References: <8a32d$43057675$4232bd1d$17412@COQUI.NET> Message-ID: Date: Fri, 19 Aug 2005 23:24:39 GMT Bill, this is really a great collection of projects that is really what radio was in the early days. It is an inspiration for all of us to do more than just recap a radio to make it play. I have been collecting part to do what you are doing some day when I retire. Maybe I shouldn't wait for that since we never know what fate will bring us tomorrow. -ex- wrote: > I finally gathered up my recent homebrew project photos and put them on > a single webpage to show off. You can see it here. Yeah, I'm kinda > proud...this is a great hobby. > > http://www.sparkbench.com/homebrew/homebrew.html > > -Bill M Article: 94120 of rec.radio.amateur.homebrew From: "Heytubeguy" Subject: FA:WESTON & SIMPSO METERS+ Message-ID: Date: Sat, 20 Aug 2005 01:14:03 GMT Several Simpson meter of the same type and a Weston meter + other items too; see at: http://search.ebay.com/_W0QQfgtpZ1QQfrppZ25QQsassZheytubeguy Tnx for looking, heytubeguy Article: 94121 of rec.radio.amateur.homebrew From: "Heytubeguy" Subject: FA: GLASS FIXED VACUUM CAPS + Message-ID: <0wvNe.637674$cg1.6991@bgtnsc04-news.ops.worldnet.att.net> Date: Sat, 20 Aug 2005 01:16:44 GMT Jennings and D&W glass fixed vacuum capacitors + meters and other things, see at; http://search.ebay.com/_W0QQfgtpZ1QQfrppZ25QQsassZheytubeguy tnx for looking, heytubeguy Article: 94122 of rec.radio.amateur.homebrew Subject: Re: Brag Page From: Ed References: <8a32d$43057675$4232bd1d$17412@COQUI.NET> Message-ID: Date: Sat, 20 Aug 2005 02:09:17 GMT -ex- wrote in news:8a32d$43057675$4232bd1d$17412 @COQUI.NET: > I finally gathered up my recent homebrew project photos and put them on > a single webpage to show off. You can see it here. Yeah, I'm kinda > proud...this is a great hobby. > > http://www.sparkbench.com/homebrew/homebrew.html > > -Bill M Damn! I am impressed. Please accept my amazement of your skills. Where do you get parts for those projects? (knobs, dials, etc.) Ed K7AAT Article: 94123 of rec.radio.amateur.homebrew Date: Fri, 19 Aug 2005 23:14:44 -0400 From: -ex- Subject: Re: Brag Page References: <8a32d$43057675$4232bd1d$17412@COQUI.NET> Message-ID: Ed wrote: > -ex- wrote in news:8a32d$43057675$4232bd1d$17412 > @COQUI.NET: > > >>I finally gathered up my recent homebrew project photos and put them on >>a single webpage to show off. You can see it here. Yeah, I'm kinda >>proud...this is a great hobby. >> >>http://www.sparkbench.com/homebrew/homebrew.html >> >>-Bill M > > > > Damn! I am impressed. Please accept my amazement of your skills. > > Where do you get parts for those projects? (knobs, dials, etc.) > > > Ed K7AAT Thanks, Ed. I'm an ebay junkie when it comes to parts hunting. -Bill WX4A/KP4 Article: 94124 of rec.radio.amateur.homebrew From: Conrad Poos Subject: Re: The Weekly F.A.Q..... References: <1124523120.544365.180540@g43g2000cwa.googlegroups.com> Message-ID: <4eCNe.9104$Il.5309@fe2.news.blueyonder.co.uk> Date: Sat, 20 Aug 2005 08:55:28 GMT Polymath wrote: > Users, such as broadcasters, > the po lice and armed farces, CBers and mobile phone > users have to purchase ready-made gear. Even though its true that only amateurs are allowed to make their own stuff, I don't see the relevance of bringing the armed services, police etc into the argument. This FarceAQ becomes increasingly bitter and bizarre with each passing week. Strong in this one is the dark side of the farce!! Poos -- vy 73 de Conrad Poos "Ich bin ein Jedi radio amateur" Article: 94125 of rec.radio.amateur.homebrew From: zzzpk_pkearn_class_a@its-as-easy-as-they-say-multi_band_cb_is_here.eircom.es.it.net (ZZZZPK ) Subject: Re: Spectrum Analyser from Cell Phones? Date: Sat, 20 Aug 2005 10:50:46 GMT Message-ID: <43070a10.451985@news.iol.ie> References: <1124040307.170942.41970@z14g2000cwz.googlegroups.com> <43024d91.3121364@news.iol.ie> "James F. Mayer" wrote: : > you mean you didnt use it to heat the place on a cold morning ? : : That's what you use the Tektronix 555 for. tee hee... had a dream the other night that i was back fixing 621-a3's !! Article: 94126 of rec.radio.amateur.homebrew From: "W3JDR" References: <1124165048.522692.10360@g43g2000cwa.googlegroups.com> <1124331183.204724.283770@o13g2000cwo.googlegroups.com> <1124422677.068571.201020@z14g2000cwz.googlegroups.com> <1124516955.436855.299510@g49g2000cwa.googlegroups.com> Subject: Re: Homebrew AM transistor radio Message-ID: Date: Sat, 20 Aug 2005 10:52:22 GMT Bill, Good to hear that you tamed the oscillation, but the 560 ohm load resistor seems a bit severe...have you tried something in the few kohms range? 50 mv out of the mixer on a 'weak' station sounds pretty good. What is the combined gain of the two IF stages? Are they possibly overloading ? Also, how are you coupling the antenna into the mixer? Joe W3JDR wrote in message news:1124516955.436855.299510@g49g2000cwa.googlegroups.com... >I sucessfully hooked up two stages with no oscillation problems. I > added a 560 ohm load resistor across the output winding of the first > stage. The LO oscillator is a separate circuit (JFET) and there are no > physical connections from the the oscillator to the mixer stage. It > seems to mix and produce the IF from just the radiation from the LO > capacitor to the station tuning capacitor. > > The IF modulated output is about 2 volts p-p on a strong station, 600 > mV on a average station, and only 50mV on weak stations. > > It's almost usable, but not quite. I need to raise the weak stations > another 12 dB or so. Also, the LO oscillator is leaking into the output > at the high end of the band. I get 100mV of noise from the LO toward > the high end. > > Is it a good idea to try and raise the gain of the 2 existing stages, > or try to add a third stage to raise the gain? > > I've noticed some transistor radios use only one IF amplifier stage > while others use 2. > > What are the advantages of the third stage if enough gain can be > obtained from just 2? > > -Bill > Article: 94127 of rec.radio.amateur.homebrew From: Conrad Poos Subject: Re: The Weekly F.A.Q..... References: <1124523120.544365.180540@g43g2000cwa.googlegroups.com> <4eCNe.9104$Il.5309@fe2.news.blueyonder.co.uk> <5LCdnea5at7tbpveRVnysA@pipex.net> <1124533053.584932.124700@g43g2000cwa.googlegroups.com> Message-ID: Date: Sat, 20 Aug 2005 10:55:13 GMT Polymath wrote: > I just hope that we have not left it too late to > prevent Ham Radio from becoming a gangrenous > degeneration of such non-technical CBers. Better a non-technical CBer than a hate-filled mentalist! Poos -- vy 73 de Conrad Poos "Ich bin ein radio amateur" Article: 94128 of rec.radio.amateur.homebrew From: Ian Liston-Smith Subject: Op amp supply-rail question Date: Sat, 20 Aug 2005 12:14:53 +0100 Message-ID: <312eg1he7tdtr9tvanovs7ek3n8q7f8efi@4ax.com> I'd like to build a tone control circuit using the LF353 dual op amp. The circuit has bass, mid range and treble adjustments. The problem: The circuit (see http://www.ece.ucsb.edu/courses/ECE002/2C_Su05Makaremi/lf353.pdf circuit on page 7) uses dual voltage rails of +15 and -15 volts, though for line input levels, this will probably work down to +8 and -8 volts. But I want to run it from a single +12 volt supply. Usually, two 100k resistors across the supply, their junction connected at the non-inverting input, alows an op amp to run from a single supply, the output floating at about half supply volts. This is fine for my use, but will it work with a dual op amp? I've searched my documentation, but found no reference to doing this for dual op amps. If it will work, will say two 100k resistors (one to +12v the other to ground, junction to pin 3) work? Does it need another 100k or so between their junction to pin 3 to isolate the input audio from the two 100k resistor potential devider? The first op ampin the LF353 application notes is only a buffer in the tone control circuit, so I guess I could avoid the problem and use a single CA3130 or similar op amp and use the 100k devider trick, and still use the tone control components. (I doubt the LF353 has any special properties for this particular use.) If anyone has another three-control op amp circuit wthat runs from a single 12v supply, I'd be interested. Thanks... Ian Article: 94129 of rec.radio.amateur.homebrew From: "the real ME" Subject: Re: The Weekly F.A.Q..... Date: Sat, 20 Aug 2005 11:34:55 +0000 (UTC) Message-ID: References: <1124523120.544365.180540@g43g2000cwa.googlegroups.com> <4eCNe.9104$Il.5309@fe2.news.blueyonder.co.uk> "Conrad Poos" wrote in message news:4eCNe.9104$Il.5309@fe2.news.blueyonder.co.uk... > Polymath wrote: > >> Users, such as broadcasters, >> the po lice and armed farces, CBers and mobile phone >> users have to purchase ready-made gear. > > Even though its true that only amateurs are allowed to make their own > stuff, I don't see the relevance of bringing the armed services, police > etc into the argument. This FarceAQ becomes increasingly bitter and > bizarre with each passing week. > > > Strong in this one is the dark side of the farce!! > > > Poos > > -- > vy 73 de Conrad Poos > > "Ich bin ein Jedi radio amateur" Wot ? You not kilfiled the twat yet ? Article: 94130 of rec.radio.amateur.homebrew From: Dr. Anton T. Squeegee Subject: Re: Op amp supply-rail question Date: Sat, 20 Aug 2005 07:12:05 -0700 Message-ID: References: <312eg1he7tdtr9tvanovs7ek3n8q7f8efi@4ax.com> In article <312eg1he7tdtr9tvanovs7ek3n8q7f8efi@4ax.com>, ian@morse- code.NO.SPAM.TODAY.fsnet.co.uk says... > I'd like to build a tone control circuit using the LF353 dual op amp. > The circuit has bass, mid range and treble adjustments. > though for line input levels, this will probably work down to +8 and > -8 volts. But I want to run it from a single +12 volt supply. The solution: You can easily get aftermarket DC/DC converter modules which will take your +12 in, and provide bipolar 15V out. Some examples: Power-One, p/n DFC10U24D15, in stock at DigiKey for about $71. Vin range of 9-36, Vout +/-15 at 300mA per, isolated outputs. .PDF spec sheet is at: http://www.power-one.com/resources/products/datasheet/dfc10d.pdf A less expensive solution with slightly lower output voltages can be found at Jameco on this link. http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1 &storeId=10001&catalogId=10001&productId=161728&pa=161728PS If the link doesn't work, try searching for Mean Well part #DKE15A-12. This one will give you +/-12V at 625mA each, isolated output, for $35 and change. I'm sure there are plenty of other manufacturers with products that can address your application. Happy hunting. -- 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: 94131 of rec.radio.amateur.homebrew From: zzzpk_pkearn_class_a@its-as-easy-as-they-say-multi_band_cb_is_here.eircom.es.it.net (ZZZZPK ) Subject: Re: Op amp supply-rail question Date: Sat, 20 Aug 2005 14:23:21 GMT Message-ID: <43073cad.1024007@news.iol.ie> References: <312eg1he7tdtr9tvanovs7ek3n8q7f8efi@4ax.com> Ian Liston-Smith wrote: : Usually, two 100k resistors across the supply, their junction : connected at the non-inverting input, alows an op amp to run from a : single supply, the output floating at about half supply volts. This is : fine for my use, but will it work with a dual op amp? I've searched my try it and see Article: 94132 of rec.radio.amateur.homebrew From: "RST Engineering" Subject: Re: Op amp supply-rail question Date: Sat, 20 Aug 2005 10:12:47 -0700 Message-ID: <11gep4s4reiq848@corp.supernews.com> References: <312eg1he7tdtr9tvanovs7ek3n8q7f8efi@4ax.com> It will work just fine with a couple of caveats. One, there needs to be a goodly sized filter capacitor at the junction of the 100K resistors. If you can stand a couple of seconds "warm up", a 100 uF will serve admirably. Two, if the noninverting inputs (+ inputs) have any function other than bias (i.e. if there is feedback to them or they are an active input) then yes, you will need some sort of isolation resistor network. How you gin that network up and keep voltage drop from happening is up to you. Jim > Usually, two 100k resistors across the supply, their junction > connected at the non-inverting input, alows an op amp to run from a > single supply, the output floating at about half supply volts. This is > fine for my use, but will it work with a dual op amp? Article: 94133 of rec.radio.amateur.homebrew From: "RST Engineering" Subject: Re: Brag Page Date: Sat, 20 Aug 2005 10:15:13 -0700 Message-ID: <11gep9e18h4pv51@corp.supernews.com> References: <8a32d$43057675$4232bd1d$17412@COQUI.NET> I believe Dizzy Dean said it first. Jim "John Ferrell" wrote in message news:dakcg1lvm4g3nerpkmeqlehau7ikpe9aou@4ax.com... > Yogi Berra said "it ain't bragging if you can do it". Article: 94134 of rec.radio.amateur.homebrew From: John Smith Subject: Re: The Weekly F.A.Q..... Message-ID: References: <1124523120.544365.180540@g43g2000cwa.googlegroups.com> <4eCNe.9104$Il.5309@fe2.news.blueyonder.co.uk> <5LCdnea5at7tbpveRVnysA@pipex.net> <1124533053.584932.124700@g43g2000cwa.googlegroups.com> <1124556484.683367.276260@z14g2000cwz.googlegroups.com> Date: Sat, 20 Aug 2005 09:53:22 -0700 PM: What you "publish" is bizarre... Frankly, in my very humble opinion, I can't imagine anyone short of a ma'roon being able to "see it" for any resemblance of truth... anyone with common sense would be ashamed to associate themselves with such... but hey, never hurts to try... ... good luck ... John On Sat, 20 Aug 2005 09:48:04 -0700, Polymath wrote: > If you think that a very genuine concern being > expressed about what Ham Radio is and what it is > not is a troll, then I fear that you yourself may > have been taken in by the CB fanatics and have become > a CBer although misbelieving that you were a Radio Ham. > > Do not side with the infantile Childish Broadcasters (CBers) > who use such unnecessary phraseology as "hate-filled > mentalist". > > (There is no hate in what I publish - all-comers are > welcome to join the ranks of _REAL_ Radio Hams - there > are no exceptions! However, that is not to say that we > must accept the Mongolian Hordes of untechnical CBers > as our fellows because that is one thing that they ain't.) > > Jim Higgins wrote: >> On Sat, 20 Aug 2005 10:55:13 GMT, in >> , Conrad Poos >> wrote: >> >Polymath wrote: >> >> I just hope that we have not left it too late to >> >> prevent Ham Radio from becoming a gangrenous >> >> degeneration of such non-technical CBers. >> >Better a non-technical CBer than a hate-filled mentalist! >> Better that you get the same clue most got some time ago and >> realize the author of this "FAQ" is a troll and you're feeding >> him. >> Non-technical CBers are just another bunch of guys having fun >> with their hobby. Live and let live. There's absolutely nothing >> redeeming about troll feeders.- Article: 94135 of rec.radio.amateur.homebrew From: "Tom" Subject: Phillips EE Kits Message-ID: Date: Sat, 20 Aug 2005 18:34:04 GMT This web site brought back quite a few memories... I played around with one of the 'EE' kits in the early 60's when I was in Thailand---Pop picked it up for me when he was in Hong Kong. http://ee.old.no/ Judging by the links presented on the page, these kits played a major role in shaping the lives of many engineers-to-be in Europe and elsewhere. I don't remember seeing these kits marketed extensively in the US although every now and then I come across a Ham's bio that contains a fond reference to them. Tom Article: 94136 of rec.radio.amateur.homebrew From: nospam@nouce.bellatlantic.net Subject: Re: Homebrew AM transistor radio Message-ID: References: <1124165048.522692.10360@g43g2000cwa.googlegroups.com> <1124331183.204724.283770@o13g2000cwo.googlegroups.com> <1124422677.068571.201020@z14g2000cwz.googlegroups.com> <1124516955.436855.299510@g49g2000cwa.googlegroups.com> Date: Sat, 20 Aug 2005 18:36:53 GMT On 19 Aug 2005 22:49:15 -0700, wrongaddress@att.net wrote: >I sucessfully hooked up two stages with no oscillation problems. I >added a 560 ohm load resistor across the output winding of the first >stage. You could load the primary instead, values in the range of 10k to 80k would be tried. > The LO oscillator is a separate circuit (JFET) and there are no >physical connections from the the oscillator to the mixer stage. It >seems to mix and produce the IF from just the radiation from the LO >capacitor to the station tuning capacitor. Not uncommon, one circuit copuples to another due to adjacent components. However, the Mixer may not be seeing the optimum LO level for best gain or overload characteristics. >The IF modulated output is about 2 volts p-p on a strong station, 600 >mV on a average station, and only 50mV on weak stations. > >It's almost usable, but not quite. I need to raise the weak stations >another 12 dB or so. Also, the LO oscillator is leaking into the output >at the high end of the band. I get 100mV of noise from the LO toward >the high end. Any number of factors here. More gain means more stanility problems. >Also, the LO oscillator is leaking into the output >at the high end of the band. I get 100mV of noise from the LO toward >the high end. The LO could be noisy due to design error. The front end (loopstick in AM BCB radios) may be tuned better at that end of the band and you hearing (seeing) more noise. Or you are seeing better coupling of the LO (increses with frequency) and better mixer gain. The MW range (300kc to 3mhz) has a very high backgound noise both teresterial and man made. . >Is it a good idea to try and raise the gain of the 2 existing stages, >or try to add a third stage to raise the gain? NO, they are only conditonally stable as is. That load on the one transformer is both robbing gain and also giving a little stability. >I've noticed some transistor radios use only one IF amplifier stage >while others use 2. Depends on perfomance. Those with one are pretty tepid in the sensitivity department. >What are the advantages of the third stage if enough gain can be >obtained from just 2? Many AM radios apply AGC to one or more stages to "level" the strong and weak stations for even audio output and to prevent later states from overloading. More stages allow for more applied AGC and overall better perfomance. Allison KB1GMX Article: 94137 of rec.radio.amateur.homebrew From: nospam@nouce.bellatlantic.net Subject: Re: Op amp supply-rail question Message-ID: References: <312eg1he7tdtr9tvanovs7ek3n8q7f8efi@4ax.com> Date: Sat, 20 Aug 2005 18:42:54 GMT On Sat, 20 Aug 2005 12:14:53 +0100, Ian Liston-Smith wrote: > >I'd like to build a tone control circuit using the LF353 dual op amp. >The circuit has bass, mid range and treble adjustments. >>>>>>>>>>>snippage>>>>>>>>>>>> > >Usually, two 100k resistors across the supply, their junction >connected at the non-inverting input, alows an op amp to run from a >single supply, the output floating at about half supply volts. This is >fine for my use, but will it work with a dual op amp? I've searched my >documentation, but found no reference to doing this for dual op amps. >If it will work, will say two 100k resistors (one to +12v the other to >ground, junction to pin 3) work? Does it need another 100k or so >between their junction to pin 3 to isolate the input audio from the >two 100k resistor potential devider? Use two 10k and at least 100uf or more of filtering . Works in designs I've built. Also insure the supply rails are well filtered and the input and output capacitors are suitably sized. >The first op ampin the LF353 application notes is only a buffer in >the tone control circuit, so I guess I could avoid the problem and >use a single CA3130 or similar op amp and use the 100k devider trick, >and still use the tone control components. (I doubt the LF353 has any >special properties for this particular use.) Use the buffer, the circuit will behave better with input sources of unknown impedence. The 353 is a nice low noise opamp. >If anyone has another three-control op amp circuit wthat runs from a >single 12v supply, I'd be interested. There are but the one you have with an artificial ground point will behave well. Allison KB1GMX Article: 94138 of rec.radio.amateur.homebrew From: "Dxer 1600" Subject: DYMEK DA9 Message-ID: Date: Sat, 20 Aug 2005 18:08:10 -0400 Hi I just picked up a (stoner) Dymek DA9 active antenna. The tuning cap has somehow been bypassed and it does nothing to affect the station. I was told that this was bypassed intentionally so as to be a broadband antenna. I'd like to resore ti to original and use the tuning cap as a preselector. Does anyone have a print / schematic on this unit ? Thanks! Article: 94139 of rec.radio.amateur.homebrew From: Bob Liesenfeld Subject: Re: Phillips EE Kits Date: Sat, 20 Aug 2005 17:49:30 -0500 Message-ID: <4307B37A.3333ACE7@visi.com> References: Tom wrote: > This web site brought back quite a few memories... I played around with one > of the 'EE' kits in the early 60's when I was in Thailand---Pop picked it up > for me when he was in Hong Kong. Yup, I had one of these as a kid. Probably the EE-20. Loved it. It was a sophisticated toy. As I got older, I used (read blew up) a lot of the components in my own experiments. Sigh.....wish I had kept it intact. Bob WB0POQ Article: 94140 of rec.radio.amateur.homebrew From: "G1LVN \(for it is he\)" Subject: Re: Spectrum Analyser from Cell Phones? Date: Sun, 21 Aug 2005 00:36:03 +0000 (UTC) Message-ID: References: <1124040307.170942.41970@z14g2000cwz.googlegroups.com> <42FF7FCB.8D940FA2@sympatico.ca> <1124201060.675868.219920@g44g2000cwa.googlegroups.com> "Tim Shoppa" wrote in message news:1124201060.675868.219920@g44g2000cwa.googlegroups.com... > > Cellphones don't really have a well-defined module like the TV tuner in > them. They aren't broadband in the same way. Their synthesizers are > not broadband either. > You obviously not seen the design to make a Nokia 3310 into a Cellphone jammer. - Simple sweep osillator curcuit built on veroboard into the battery compartment ? Just plug the mains addaptor into a stangard 240v 13A GNER/VIRGIN power outlet and enjoy hours of non-mobile-phone-interrupted-journey. -- 73deG1LVN http://www.outpimp.com/?x=481566961 Article: 94141 of rec.radio.amateur.homebrew From: "Tom" References: <4307B37A.3333ACE7@visi.com> Subject: Re: Phillips EE Kits Message-ID: Date: Sun, 21 Aug 2005 01:21:13 GMT Bob Liesenfeld wrote in message news:4307B37A.3333ACE7@visi.com... > > > Tom wrote: > > > This web site brought back quite a few memories... I played around with one > > of the 'EE' kits in the early 60's when I was in Thailand---Pop picked it up > > for me when he was in Hong Kong. > > Yup, I had one of these as a kid. Probably the EE-20. Loved it. It was a > sophisticated toy. As I got older, I used (read blew up) a lot of the > components in my own experiments. Sigh.....wish I had kept it intact. > > Bob WB0POQ > I looked though my stuff and all I could find of my EE20 was a heat sink, the ferrite rod and the Valvo OA76 diode (I think that diode came from the kit). Blew up components is right... I recall electrolytic capacitors coming apart when they were hooked up wrong---I had to get new 100 mf capacitors. I remember building the: Vochtigheidsindicator (moisture indicator) Automatische nachtlamp Morse-code apparaat met oortelefoon Morse-code apparaat met luidspreker Did you see this link to the EE20? http://www.rrd.demon.nl/Philips%20experimenteerdozen/foto_ee20.htm I tried to download the pdf template file but I didn't get anything. You're right, they were nicely put together kits. I'll keep my eyes open on eBay for them---maybe even try the Dutch eBay. Tom Article: 94142 of rec.radio.amateur.homebrew From: "Tom" References: <4307B37A.3333ACE7@visi.com> Subject: Re: Phillips EE Kits Message-ID: <0MQNe.643747$cg1.41239@bgtnsc04-news.ops.worldnet.att.net> Date: Sun, 21 Aug 2005 01:27:24 GMT Sorry, I meant this link to the EE20 http://members.lycos.nl/bouwdoos/ee8.html Article: 94143 of rec.radio.amateur.homebrew From: John Smith Subject: Re: Spectrum Analyser from Cell Phones? Message-ID: References: <1124040307.170942.41970@z14g2000cwz.googlegroups.com> <42FF7FCB.8D940FA2@sympatico.ca> <1124201060.675868.219920@g44g2000cwa.googlegroups.com> Date: Sat, 20 Aug 2005 18:08:28 -0700 G1LVN: Such things can be done, but that certainly sounds much less than workable! The plans there might better function as a "Burnt Wiring Smell Generator!" I have built a few of 'em, most likely there are still a few left waiting to be built in my future... John On Sun, 21 Aug 2005 00:36:03 +0000, G1LVN (for it is he) wrote: > Nokia 3310 Article: 94144 of rec.radio.amateur.homebrew From: "Dennis Daly" References: <8a32d$43057675$4232bd1d$17412@COQUI.NET> Subject: Re: Brag Page Message-ID: Date: Sun, 21 Aug 2005 06:31:02 GMT "-ex-" wrote in message news:8a32d$43057675$4232bd1d$17412@COQUI.NET... > I finally gathered up my recent homebrew project photos and put them on > a single webpage to show off. You can see it here. Yeah, I'm kinda > proud...this is a great hobby. > > http://www.sparkbench.com/homebrew/homebrew.html > > -Bill M A true craftsman! Beautiful..As usual. Den Article: 94145 of rec.radio.amateur.homebrew From: "William E. Sabin" References: <8a32d$43057675$4232bd1d$17412@COQUI.NET> Subject: Re: Brag Page Message-ID: Date: Sun, 21 Aug 2005 08:00:41 GMT Congratulations on your interesting and well done homebrew projectts. Bill W0IYH "-ex-" wrote in message news:8a32d$43057675$4232bd1d$17412@COQUI.NET... >I finally gathered up my recent homebrew project photos and put them on a >single webpage to show off. You can see it here. Yeah, I'm kinda >proud...this is a great hobby. > > http://www.sparkbench.com/homebrew/homebrew.html > > -Bill M Article: 94146 of rec.radio.amateur.homebrew From: "amdxjunk" References: Subject: Re: Microwave transformer HF PA Powersupply Date: Sun, 21 Aug 2005 06:58:38 -0500 Message-ID: <29492$43086c70$18d6b479$8475@KNOLOGY.NET> Hi Sven, QEX Jan/Feb 1998 has an article using four microwave oven transformers to build a HV power supply. Glancing thru I see that a magnetic shunt is removed from the transformers as these will cause poor regulation. I'll read it today a see if I can add more info. I recommend you locate the article. Mike "Sven Arne Astrup" wrote in message news:F--dnQqfzJj0uJveRVnzvA@telenor.com... > Hallo! > > I am seeking some info about using transformers from microwave ovens in HF > PA power supplies. As one side of the secondary winding is connected to the > transformer core, I am a bit confused on how to do the voltage doubling. > > Any info on the subject is appreciated. > > 73 de Sven LA6KJ > > -- > > > All incoming and outgoing E-mail > scanned by NAV 2005. > > From al xx at al xx dot net - remove spaces replace dot and at Sun Aug 21 11:42:01 EDT 2005 Article: 94147 of rec.radio.amateur.homebrew From: "Alex Gibson" Newsgroups: rec.radio.amateur.homebrew,uk.radio.amateur Subject: Re: Spectrum Analyser from Cell Phones? Date: Sun, 21 Aug 2005 22:15:43 +1000 Lines: 32 Message-ID: <3mrc9qF18atjlU2@individual.net> References: <1124040307.170942.41970@z14g2000cwz.googlegroups.com> Reply-To: "Alex Gibson" X-Trace: individual.net DMcUUZAgPWPf7wGmDrQNWQcXYTPsJyKL2pDhFiPo2I6VkpbodC X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2900.2670 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2670 X-RFC2646: Format=Flowed; Original Path: news1.isis.unc.edu!arclight.uoregon.edu!news.uni-stuttgart.de!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail Xref: news1.isis.unc.edu rec.radio.amateur.homebrew:94147 uk.radio.amateur:241659 "Polymath" wrote in message news:1124040307.170942.41970@z14g2000cwz.googlegroups.com... >I wonder if anyone has successfully converted a > thrown-away cell-phone into a spectrum analyser? > > We would seem to have all the necessary components > in there for free - keyboard, graphical display, > post-demodulation DSP, Frequency Synthesizer, > RF good up to 1 GHz (2G5Hz if an ex-WCDMA unit) > > Here would seem to be an opportunity to equip > all Radio Hams with a reasonably state-of-the-art > piece of test gear, that when coupled with an > IF generator would give us all a network analyser > into the bargain! > A few people are looking at turning one of the xilinx S3 (spartan3) starter kits into spectrum analysers and logic analyser with a vga output. http://www.xilinx.com/xlnx/xebiz/designResources/ip_product_details.jsp?sGlobalNavPick=PRODUCTS&sSecondaryNavPick=Design+Tools&category=&iLanguageID=1&key=DO-SPAR3-DK http://www.fpga4fun.com/digitalscope.html http://www.fpga4fun.com/board_flashy.html Problem with a lot of the phone stuff is getting access to the chips pins for programming (if they had them in the first place). Chips are factory programmed and not reprogrammable. Article: 94148 of rec.radio.amateur.homebrew From: "William E. Sabin" References: <8a32d$43057675$4232bd1d$17412@COQUI.NET> <1124629139.879571.274690@g43g2000cwa.googlegroups.com> Subject: Re: Brag Page Message-ID: Date: Sun, 21 Aug 2005 14:49:23 GMT No, they are made by Hammond Co. in Canada and purchased through the Newark Catalog. They are excellent steel cabinets and quite heavy. I have made some cabinets in the past, but nothing as nice as these. Bill W0IYH "Eddie Brimer" wrote in message news:1124629139.879571.274690@g43g2000cwa.googlegroups.com... > bill, do you make your own cabinets? nice work! > Article: 94149 of rec.radio.amateur.homebrew From: "amdxjunk" References: Subject: Re: Microwave transformer HF PA Powersupply Date: Sun, 21 Aug 2005 10:10:02 -0500 Message-ID: <73fae$4308994d$18d6b479$1316@KNOLOGY.NET> Hi Sven, The author built a 500V screen supply and a 2700V plate supply. The magnetic shunts must be driven out using a hammer and a chisel of about the same size as the shunt. The author had MOT's with the secondary unconnected to the case. He did design so if he had to replace a MOT it would work with a case connected secondary. He mounted the transformers so they were insulated from everything except the case of the others. The cases were the center tap. With the large output capacitor, he designed in a slow start circuit to prevent damage from large inrush currents trying to charge the cap. I located an article below that has more info. I searched " Build a high voltage power supply at low cost QEX" The author is Randy Henderson WI5W >Michael A. Terrell wrote: >> >> >> The welded cores can cause problems. This has been discussed on the >>various sci.electronics.* groups a number of times >> >The key phrase to search for is "magnetic shunt". Typically the magnetic >shunt consists of two extra blocks of laminations between the primary >and secondary bobbins. This has been added to give the transformer a >current-limiting characteristic, which is necessary to power a magnetron >- but is exactly the opposite of what you need for normal vacuum tubes. > >In many oven transformers, the magnetic shunt blocks can be driven out >with a large punch, to leave a more normal-looking transformer. > >The not-so-good news is that you're still left with a transformer that >has a very high secondary voltage and rather high secondary resistance, >which will give poor voltage regulation in typical amateur use. Also one >end of the secondary winding is usually grounded to the core. Even if >you can get to the grounded end to disconnect it, the insulation close >to the core is not designed for typical full-wave bridge applications. > >Some people have had limited success with a pair of identical >transformers connected as a "centre-tapped" winding... but remember that >in two separate transformers the core magnetization by the DC components >will not cancel. > >It all seems like a lot of effort for rather poor results. The worst problem is idle current, 1.2-1.5A on 240VAC, so you should use the extra space and add 100turns for the primary, and reduce the idle current to 0.3A. This will also reduce the output voltage below 2kV DC. Many cores are standard E120 types and it isn't worth the trouble of trying to use the original rubbish I've planned to bring some information on http://home.online.no/~la8ak/d4.htm , but haven't translated it into English yet 73 LA8AK --- J. M. Noeding, LA8AK, N-4623 Kristiansand http://home.online.no/~la8ak/91n.htm "Sven Arne Astrup" wrote in message news:F--dnQqfzJj0uJveRVnzvA@telenor.com... > Hallo! > > I am seeking some info about using transformers from microwave ovens in HF > PA power supplies. As one side of the secondary winding is connected to the > transformer core, I am a bit confused on how to do the voltage doubling. > > Any info on the subject is appreciated. > > 73 de Sven LA6KJ > > -- > > > All incoming and outgoing E-mail > scanned by NAV 2005. > > Article: 94150 of rec.radio.amateur.homebrew Date: Sun, 21 Aug 2005 13:09:31 -0400 From: -ex- Subject: Re: Brag Page References: <8a32d$43057675$4232bd1d$17412@COQUI.NET> <1124629139.879571.274690@g43g2000cwa.googlegroups.com> Message-ID: William E. Sabin wrote: > No, they are made by Hammond Co. in Canada and purchased through the Newark > Catalog. They are excellent steel cabinets and quite heavy. I have made > some cabinets in the past, but nothing as nice as these. > > Bill W0IYH Its easier than you think to make these little cabinets. My "woodshop" consists of a clear area on the floor in the shack where I can sit and do small-scale woodworking. Woodshop machinery includes a cheapo Black and Decker sabre saw, and a cheapo Craftsman (or whatever lasts more than 90 days) finishing sander. Recently I upgraded to a little Micromark hobby-sized table saw and a small Skil belt sander for convenience. Hey, who needs a good saw if you have a good belt sander?!? I won't be making any kitchen cabinets or furniture with this setup unless its for dollhouses! -Bill Article: 94151 of rec.radio.amateur.homebrew From: "Richard" Subject: Re: Phillips EE Kits Date: Mon, 22 Aug 2005 14:57:35 +0100 Message-ID: <3mu3s8F18kt7eU1@individual.net> References: <4307B37A.3333ACE7@visi.com> "Bob Liesenfeld" wrote in message news:4307B37A.3333ACE7@visi.com... > > > Tom wrote: > > > This web site brought back quite a few memories... I played around with one > > of the 'EE' kits in the early 60's when I was in Thailand---Pop picked it up > > for me when he was in Hong Kong. > > Yup, I had one of these as a kid. Probably the EE-20. Loved it. It was a > sophisticated toy. As I got older, I used (read blew up) a lot of the > components in my own experiments. Sigh.....wish I had kept it intact. > > Bob WB0POQ > Ha. That's takes me right back to '66. I was so keen to put the radio together I did not bother with understanding resistor colour codes, I just banged anything in for the resistors. Then one of the electroylitics went "Bang!". Happy days. Article: 94152 of rec.radio.amateur.homebrew From: "Peter Barbella" References: <312eg1he7tdtr9tvanovs7ek3n8q7f8efi@4ax.com> Subject: Re: Op amp supply-rail question Message-ID: Date: Mon, 22 Aug 2005 16:29:00 GMT Hello, Use 10K resistors instead of 100K resistors and be sure to include a fat Capacitor from the midpoint to ground. Then tie the ground end of the 10k resistor on pin 3 and pin 5 to the junction of the resistor divider and cap. (do not tie it to pin 3 directly). Should work with limited dynamic range. Regards, Pete KB1LZH "Ian Liston-Smith" wrote in message news:312eg1he7tdtr9tvanovs7ek3n8q7f8efi@4ax.com... > > I'd like to build a tone control circuit using the LF353 dual op amp. > The circuit has bass, mid range and treble adjustments. > > The problem: > The circuit (see > http://www.ece.ucsb.edu/courses/ECE002/2C_Su05Makaremi/lf353.pdf > circuit on page 7) uses dual voltage rails of +15 and -15 volts, > though for line input levels, this will probably work down to +8 and > -8 volts. But I want to run it from a single +12 volt supply. > > Usually, two 100k resistors across the supply, their junction > connected at the non-inverting input, alows an op amp to run from a > single supply, the output floating at about half supply volts. This is > fine for my use, but will it work with a dual op amp? I've searched my > documentation, but found no reference to doing this for dual op amps. > If it will work, will say two 100k resistors (one to +12v the other to > ground, junction to pin 3) work? Does it need another 100k or so > between their junction to pin 3 to isolate the input audio from the > two 100k resistor potential devider? > > The first op ampin the LF353 application notes is only a buffer in > the tone control circuit, so I guess I could avoid the problem and > use a single CA3130 or similar op amp and use the 100k devider trick, > and still use the tone control components. (I doubt the LF353 has any > special properties for this particular use.) > > If anyone has another three-control op amp circuit wthat runs from a > single 12v supply, I'd be interested. > > Thanks... > > Ian Article: 94153 of rec.radio.amateur.homebrew From: "Gene Rodgers" Subject: FS/FT: Motorola Base Station/Repeater? Message-ID: Date: Mon, 22 Aug 2005 18:29:42 GMT I have a Transmitter which is rack mounted in a cabinet and capable of over 150 watts but will dead key transmit at 120 watts (continuous). The transmit is variable from 5 watts to 120 watts. I also have a dual Receiver rack mounted in a cabinet. Both have power supplies and are very heavy duty pieces of equipment. Wouldn't take much to convert to a 440 repeater or use as is for volunteer fire department or small city. Units must be picked up in Dallas.Comes complete with manuals for both. Will sell (make offer) or trade for good Ham HF rig, or ????. Pictures of manual & rig: http://www.grodgers.com/dfwforsale/transmitter440.jpg http://www.grodgers.com/dfwforsale/receiver440.jpg Units are skid mounted and virtually unused. Appereantly this was a backup unit. Contact me at ke5bfa@comcast.net or reply to this email. Gene Article: 94154 of rec.radio.amateur.homebrew From: "Larry Fowkes" References: <8a32d$43057675$4232bd1d$17412@COQUI.NET> Subject: Re: Brag Page Date: Fri, 19 Aug 2005 06:34:11 -0400 Message-ID: <4305b650$0$3733$2c56edd9@news.cablerocket.com> "-ex-" wrote in message news:8a32d$43057675$4232bd1d$17412@COQUI.NET... > I finally gathered up my recent homebrew project photos and put them on > a single webpage to show off. You can see it here. Yeah, I'm kinda > proud...this is a great hobby. > > http://www.sparkbench.com/homebrew/homebrew.html > > -Bill M Bill, Where did you find the brass binding posts used on your batteries and some of the sets? Making up some "refillable" B and C batteries is on my to do list. Your sets are beautiful, I sure wish I had those kind of woodworking skills. Larry Fowkes Article: 94155 of rec.radio.amateur.homebrew From: "Joel Kolstad" Subject: Re: RadioShack Catalog Date: Mon, 22 Aug 2005 16:10:10 -0700 Message-ID: <11gkmq4jollsr20@corp.supernews.com> References: <9eaMe.614039$cg1.103783@bgtnsc04-news.ops.worldnet.att.net> <11g2d14ic142b3c@corp.supernews.com> "Reloader" wrote in message news:Reloader.1tvlcv@news.radiobanter.com... > Back in the '70 you had to demoinstrate knoweledge of electronics before > you could be hired; not an expert, but at least understand what the > customer was looking for. I worked for them until '79. Their new > slogan is "you got questions, we got insults." I doubt that requiring applicants to demonstrate knowledge of electronics would work anymore. I believe that most Radio Shacks start people at minimum wage plus commisions on cell phones, extended warranties, etc., so when that's the 'deal' you're looking at, a would-be employee can do just as well working at many other stores that don't require any particular knowledge of what it is, exactly, that the store is selling. Personally, I think you could run many stores with, say, 2/3 the people and pay them 3/2 as much as normal and thereby demand some actual skills and retain them (and work 3/2 as hard!), but unfortunately that doesn't seem to be the standard business strategy these days. ---Joel Kolstad Article: 94156 of rec.radio.amateur.homebrew From: Skipp says hello Subject: Re: Microwave transformer HF PA Powersupply Date: Mon, 22 Aug 2005 23:30:15 +0000 (UTC) Message-ID: References: Hi Sven, There's a public group on Yahoo all about building rf amplifiers. You can find it at: http://groups.yahoo.com/group/rfamplifiers/ In the files section of the group... I've placed a copy of the Microwave Oven QEX article. There's also some pictures in the photos section of the same group. The group is open to everyone... enjoy skipp : Sven Arne Astrup wrote: : Hallo! : I am seeking some info about using transformers from microwave ovens in HF : PA power supplies. As one side of the secondary winding is connected to the : transformer core, I am a bit confused on how to do the voltage doubling. : Any info on the subject is appreciated. : 73 de Sven LA6KJ : -- : All incoming and outgoing E-mail : scanned by NAV 2005. Article: 94157 of rec.radio.amateur.homebrew From: Skipp Subject: Yahoo RF Amplifiers Group Date: Mon, 22 Aug 2005 23:36:09 +0000 (UTC) Message-ID: Hello there, Just a shameless plug for the Yahoo rfamplifiers group, which is open to the public and happy to have questions thrown to the group. http://groups.yahoo.com/group/rfamplifiers/ Hope to see you there... cheers skipp Article: 94158 of rec.radio.amateur.homebrew From: John Smith Subject: Re: Yahoo RF Amplifiers Group Message-ID: References: Date: Mon, 22 Aug 2005 16:37:44 -0700 Skipp: Really needs to be a newsgroup started on rf power-amps/linears ... John On Mon, 22 Aug 2005 23:36:09 +0000, Skipp wrote: > > Hello there, > > Just a shameless plug for the Yahoo rfamplifiers group, which is open to > the public and happy to have questions thrown to the group. > > http://groups.yahoo.com/group/rfamplifiers/ > > Hope to see you there... > > cheers > skipp Article: 94159 of rec.radio.amateur.homebrew From: rbean@shell.core.com (Ron Bean) Subject: Re: Desktop metal shielded PC case? Date: Tue, 23 Aug 2005 00:39:48 -0000 Message-ID: <11gks2kmtouq3fc@corp.supernews.com> References: <1116180057.598783.160160@g14g2000cwa.googlegroups.com> shoppa@trailing-edge.com writes: >I'm looking for a solid desktop (either pizza-box or mini-tower) >computer case that has an all-metal exterior for shielding RFI. This >is for use around radios etc. I realize that SVGA monitors, mice, and >keyboard leak too, but right now I'm looking mainly at the PC box. I know this is an old thread, but I have a related question: Quite a few people are building their own PC cases these days-- for example, http://www.mini-itx.com (follow the links on the right side of the page). As far as I can see, none of these has *any* RF shielding at all. And I have yet to hear of them causing any problems (these are not ham radio operators). The only RF problems I've heard of recently (with consumer electronics) are microwave ovens interfering with some kinds of cordless phones. I'm thinking maybe the only kind of RFI "the masses" are worried about is TV, and they all have cable... So I'm thinking of building a computer case for a specific use, and I'm wondering if I should bother to worry about shielding (evidence suggests maybe not). My first thought was aluminum foil, but aluminum forms a non-conductive oxide, and I don't know if it would ground reliably (not to mention the "tinfoil hat" jokes). My second thought was copper foil from http://www.onlinemetals.com (around $.98/sq ft, but shipping adds quite a bit). Any comments? PS: I like this one: http://www.mini-itx.com/projects/cardboardcube/ Article: 94160 of rec.radio.amateur.homebrew From: adykes@panix.com (Al Dykes) Subject: Re: Desktop metal shielded PC case? Date: 22 Aug 2005 20:46:38 -0400 Message-ID: References: <1116180057.598783.160160@g14g2000cwa.googlegroups.com> <11gks2kmtouq3fc@corp.supernews.com> In article <11gks2kmtouq3fc@corp.supernews.com>, Ron Bean wrote: > >shoppa@trailing-edge.com writes: > >>I'm looking for a solid desktop (either pizza-box or mini-tower) >>computer case that has an all-metal exterior for shielding RFI. This >>is for use around radios etc. I realize that SVGA monitors, mice, and >>keyboard leak too, but right now I'm looking mainly at the PC box. > >I know this is an old thread, but I have a related question: > >Quite a few people are building their own PC cases these days-- >for example, http://www.mini-itx.com (follow the links on the right side >of the page). > >As far as I can see, none of these has *any* RF shielding at all. And I >have yet to hear of them causing any problems (these are not ham radio >operators). The only RF problems I've heard of recently (with consumer >electronics) are microwave ovens interfering with some kinds of cordless >phones. > >I'm thinking maybe the only kind of RFI "the masses" are worried about >is TV, and they all have cable... > >So I'm thinking of building a computer case for a specific use, and >I'm wondering if I should bother to worry about shielding (evidence >suggests maybe not). > What are you worried about? Ham and short wave fans have a legit issue, and I guess people doing *very* high quality audio do also. If you don't fit in a special catagory try taking the top of a standard PC and hold an AM and an FM radio right next to the running PC and listen for the noise. You won't hear much. Try it again with the lid on. PC cases are built to FCC and European specs for radio emissions. They are fairly tightly sealed. The vast amount of emmisions that *do* come out go over all the wires connected to the PC. Pick up an ARRL handboox about sheilding and RF interferance if you want to learn more. http://www.arrl.org/ -- a d y k e s @ p a n i x . c o m Don't blame me. I voted for Gore. Article: 94161 of rec.radio.amateur.homebrew From: Bob Liesenfeld Subject: Re: Phillips EE Kits Date: Mon, 22 Aug 2005 20:25:16 -0500 Message-ID: <430A7AFC.53618F62@visi.com> References: <4307B37A.3333ACE7@visi.com> <3mu3s8F18kt7eU1@individual.net> > > > > > Ha. That's takes me right back to '66. > > I was so keen to put the radio together I did not bother with understanding > resistor colour codes, I just banged anything in for the resistors. Then > one of the electroylitics went "Bang!". Happy days. Heheheh. My take on that was to figure that all those resistors and caps in a 2 stage AF amp were not really needed to make it work, they just made it work *better*. So.....I ended up building a 2 stage direct coupled amp before I even knew what direct coupled was......till one of the transistors got so hot >it< went BANG! --Sigh-- To recapture some of that wide eyed "Will it work!?" Do kids even think that way today? My experience says no. :( Bob WB0POQ Article: 94162 of rec.radio.amateur.homebrew From: "Roger Leone" References: <312eg1he7tdtr9tvanovs7ek3n8q7f8efi@4ax.com> Subject: Re: Op amp supply-rail question Message-ID: Date: Tue, 23 Aug 2005 01:41:10 GMT Ian: A friend of mine designed a bass/treble equalizer around the LF353, using a single supply. Several people (including me) have duplicated this circuit with good results. Perhaps you can use the DC parts of the circuit in your 3 channel equalizer: www.tleone.com/roger/mic_eq.jpg Roger K6XQ Article: 94163 of rec.radio.amateur.homebrew From: John - KD5YI Subject: Re: RadioShack Catalog References: <9eaMe.614039$cg1.103783@bgtnsc04-news.ops.worldnet.att.net> <11g2d14ic142b3c@corp.supernews.com> <82ac1$4302584b$4232bdaa$20550@COQUI.NET> <11g76bkik7pa515@corp.supernews.com> Message-ID: Date: Tue, 23 Aug 2005 02:10:22 GMT john graesser wrote: > "Dave" wrote in message > news:wM2dnb0lctlw_Z_eRVn-rQ@comcast.com... > >> Well RS is doing well financially, better than the competition. As for >>what they sell, well, you have to follow the money especially with the > > rents > >>so high. Cellphones, satellite service and other modern fun things is > > where > >>the money is now. Parts make up very little of the business, even though >>they make a high profit on them. The do-it-yourself market is pretty lean >>now a days, with college areas making up the biggest market. It is to easy >>to buy a digital rig and get it up and running than a homebrew one. Even >>though the homebrew one is funner to get going. > > > I recall a UP story a couple of weeks ago that stated RS had 50 million > profit off of over 1 billion in sales. So they are selling a hell of a lot > but barely staying in the black. 1/2 of 1 percent profit? Even a passbook > savings acct gets a better return than that. > Um, as I recall, 1 billion is 1000 million (in the USA where Radio Shack is). So that would be 50/1000 or 5% profit. John Article: 94164 of rec.radio.amateur.homebrew From: John - KD5YI Subject: Re: RadioShack Catalog References: <9eaMe.614039$cg1.103783@bgtnsc04-news.ops.worldnet.att.net> Message-ID: Date: Tue, 23 Aug 2005 02:16:03 GMT Larry Gagnon wrote: > On Tue, 16 Aug 2005 00:15:01 +0000, Tom wrote: > > >>Got the word today at the neighborhood RadioShack that a catalog will once >>again be available---no date offered but should be soon. >> >>Tom > > > Who cares? Their stuff has been and probably always will be a POS. I > have never seen worse electronic components sold to the general public > than the junk in that store. Avoid them like the plague. > > Larry VE7EA Maybe they should go back to selling leather. John Article: 94165 of rec.radio.amateur.homebrew Date: Tue, 23 Aug 2005 07:29:01 -0400 From: -ex- Subject: Re: Brag Page References: <8a32d$43057675$4232bd1d$17412@COQUI.NET> Message-ID: Phil B wrote: > Bill, > > I'm a little late after all the oozing from others, but I must say your > homebrews are fascinating and your other project sequence photos are > wonderful. You web site is great! > > Phil B > > Thank you! Bill Article: 94166 of rec.radio.amateur.homebrew From: "Tomek" Subject: MB3763P - where to buy? Date: Tue, 23 Aug 2005 15:22:19 +0200 Message-ID: Hello, I am looking for MB3763P (Bidirectional motor driver from Fujitsu) Do you know where I can buy the chip? 73 from Poland Tomek sp8ncg Article: 94167 of rec.radio.amateur.homebrew Message-ID: <430B29C4.7FC83D15@case.net> From: case_dude Subject: Re: Desktop metal shielded PC case? References: <1116180057.598783.160160@g14g2000cwa.googlegroups.com> <11gks2kmtouq3fc@corp.supernews.com> Date: Tue, 23 Aug 2005 13:51:02 GMT Just get one of the name brand pc's from a yard sale, or thrift shop. These cases have paint inside that helps stop the emi from getting out. Good quality cables are also a must. case_dude Article: 94168 of rec.radio.amateur.homebrew From: "John A" Subject: HP 8558B Analyser Problem - Help Needed Date: Tue, 23 Aug 2005 14:58:18 +0100 Message-ID: Hi All, My HP8558B has developed a fault. Could anyone advise? Up to about 4MHz the sweep consists of a distorted 0MHz peak then a sloping, noise-free, baseline. Above 4MHz the analyser works fine At a Reference Level switch setting of -30dB there is about one division of noise nad signal appear as expected The distortion of the 0MHz peak and the slope of the 0 to 4MHz section of the sweep varies with the setting of the Reference Level Switch but the actual gain settings seem to be correct, once you are above 4MHz. Also odd single spikes appear in this region at different Ref Level settings Anything else you need to know? TIA John Article: 94169 of rec.radio.amateur.homebrew From: "Pete KE9OA" References: Subject: Re: HP 8558B Analyser Problem - Help Needed Message-ID: Date: Tue, 23 Aug 2005 18:42:26 GMT This is a dumb question, but I have to ask......................does this only show up at the wider I.F. bandwidth settings? If so, this is normal. Do you have the sweep set to automatic or manual mode? If you have your sweep set to manual mode and your sweep is set too fast, this can occur. Pete "John A" wrote in message news:defa29$fit$1@newsg1.svr.pol.co.uk... > Hi All, > > My HP8558B has developed a fault. Could anyone advise? > > Up to about 4MHz the sweep consists of a distorted 0MHz peak then a > sloping, > noise-free, baseline. Above 4MHz the analyser works fine At a Reference > Level switch setting of -30dB there is about one division of noise nad > signal appear as expected > > The distortion of the 0MHz peak and the slope of the 0 to 4MHz section of > the sweep varies with the setting of the Reference Level Switch but the > actual gain settings seem to be correct, once you are above 4MHz. Also odd > single spikes appear in this region at different Ref Level settings > > Anything else you need to know? > > TIA > > John > > Article: 94170 of rec.radio.amateur.homebrew From: "Charles Brabham" Subject: HamPoll.Com Message-ID: Date: Tue, 23 Aug 2005 21:21:44 GMT HamPoll is here in order to give amateurs a chance to speak for themselves, and in time to provide reasonably accurate and significant polling data on a variety of issues related to the amateur radio service. You are welcome to browse the polling data we have, but we especially encourage US amateurs visiting here to register with thier callsign and vote in the HamPoll Polling Station. Whether you come to browse, to discuss or submit new polls, or to tender your vote, be sure to visit regularly as new polls are included from time to time, and the poll data changes as more hams participate day to day. Stop by at: http://www.hampoll.com Charles Brabham, N5PVL Director: USPacket http://www.uspacket.org Admin: HamBlog.Com http://www.hamblog.com ---------- HamPoll.Com http://www.hampoll.com ---------- DigiBlog http://www.uspacket.org/digiblog/ Article: 94171 of rec.radio.amateur.homebrew From: "Caveat Lector" References: Subject: Re: HamPoll.Com Message-ID: <7%MOe.689$mH.39@fed1read07> Date: Tue, 23 Aug 2005 14:59:32 -0700 You will probably lose half your readers by asking them to register I don't register for anything And I get very little spam Sorry -- CL -- I doubt, therefore I might be ! "Charles Brabham" wrote in message news:IrMOe.1022$yo7.877@newssvr23.news.prodigy.net... > HamPoll is here in order to give amateurs a chance to speak for > themselves, and in time to provide reasonably accurate and significant > polling data on a variety of issues related to the amateur radio service. > > You are welcome to browse the polling data we have, but we especially > encourage US amateurs visiting here to register with thier callsign and > vote in the HamPoll Polling Station. > > Whether you come to browse, to discuss or submit new polls, or to tender > your vote, be sure to visit regularly as new polls are included from time > to time, and the poll data changes as more hams participate day to day. > > Stop by at: http://www.hampoll.com > > Charles Brabham, N5PVL > > Director: USPacket http://www.uspacket.org > Admin: HamBlog.Com http://www.hamblog.com > ---------- HamPoll.Com http://www.hampoll.com > ---------- DigiBlog http://www.uspacket.org/digiblog/ > > Article: 94172 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: HamPoll.Com Date: Tue, 23 Aug 2005 16:10:31 -0700 Message-ID: <11gnb7a3c1ifq9f@corp.supernews.com> References: I associate a .com web site extension as having a commercial, for-profit purpose. Asking for people to register and leave information about personal preferences makes it look an awful lot like you're collecting data to sell for marketing purposes. If that's not the purpose of your commercial enterprise, I suggest that you state clearly what the purpose is, how you make your money, and why people need to register in order to leave their opinions. If it's a non-profit enterprise, I suggest you get an .org extension, and clearly state on the site that it's not for profit. Roy Lewallen, W7EL Charles Brabham wrote: > HamPoll is here in order to give amateurs a chance to speak for themselves, > and in time to provide reasonably accurate and significant polling data on a > variety of issues related to the amateur radio service. > > You are welcome to browse the polling data we have, but we especially > encourage US amateurs visiting here to register with thier callsign and vote > in the HamPoll Polling Station. > > Whether you come to browse, to discuss or submit new polls, or to tender > your vote, be sure to visit regularly as new polls are included from time to > time, and the poll data changes as more hams participate day to day. > > Stop by at: http://www.hampoll.com > > Charles Brabham, N5PVL > > Director: USPacket http://www.uspacket.org > Admin: HamBlog.Com http://www.hamblog.com > ---------- HamPoll.Com http://www.hampoll.com > ---------- DigiBlog http://www.uspacket.org/digiblog/ > > Article: 94173 of rec.radio.amateur.homebrew From: "Richard W. Solomon, W1KSZ" Subject: WTD: Powerpole 180A Connectors Message-ID: <6mbng1199dj1p6ji91rf198rrnh99jrr00@4ax.com> Date: Tue, 23 Aug 2005 23:20:30 GMT The Glenayre Power Supply I got with it's companion Amp uses 180A Powerpole Connectors for the 28 vdc output. Anyone got a spare couple of these beasties ?? Even better would be the interconnecting power cable, there are two ~1/4" pins for the +DC and two ~1/4" jacks for the -DC. I found a GR double plug fits the -DC, but the +DC has me stumped. I hate to tack solder a lead on them (too tacky !!). 73, Dick, W1KSZ Article: 94174 of rec.radio.amateur.homebrew From: Allodoxaphobia Subject: Re: HamPoll.Com Date: 24 Aug 2005 02:17:22 GMT Message-ID: References: On Tue, 23 Aug 2005 21:21:44 GMT, Charles Brabham wrote: > HamPoll is here in order to give amateurs a chance to speak for themselves, > and in time to provide reasonably accurate and significant polling data on a > variety of issues related to the amateur radio service. Hell, that's what I thought usenet was for... Jonesy W3DHJ Article: 94175 of rec.radio.amateur.homebrew Date: Tue, 23 Aug 2005 22:33:08 -0400 From: -ex- Subject: Re: Stable Regen Receiver--Does it Exist?? References: <1124850656.892394.139930@f14g2000cwb.googlegroups.com> Message-ID: kizerian@xmission.com wrote: > I have built a few dozen regen receivers and they all seem to work well > enough on AM signals--some extremely well--but kind of fall apart when > it comes to STABLE reception of CW and SSB. > > Has anyone ever built a solid state regen that does well with CW and > SSB? If so I would love to know how you did it > Check out something like one of the superhet regens. I've done a couple of tube versions which are quite stable. -Bill Article: 94176 of rec.radio.amateur.homebrew From: et472@FreeNet.Carleton.CA (Michael Black) Subject: Re: Stable Regen Receiver--Does it Exist?? Date: 24 Aug 2005 03:07:41 GMT Message-ID: References: <1124850656.892394.139930@f14g2000cwb.googlegroups.com> (kizerian@xmission.com) writes: > I have built a few dozen regen receivers and they all seem to work well > enough on AM signals--some extremely well--but kind of fall apart when > it comes to STABLE reception of CW and SSB. > > Has anyone ever built a solid state regen that does well with CW and > SSB? If so I would love to know how you did it (I'd even share my some > of my massive collection of radio parts with you)...before I go off and > build another dozen regens. > > I have a box full of prototypes affectionately dubbed my radio reject > graveyard (or dead radio pile)...I just don't want to be up to my neck > in more prototypes before I finally get a good one. > > Seriously thinking of skipping it and building a simple DC or superhet. > I don't know. But for much of their life, they have been treated as simple receivers. First in the twenties or so, when things were expensive so it was as minimal as possible. In more recent decades, because they were seen as a beginner item, an alternative to a complicated superhet. Simple is bound to mean tradeoffs. Realistically they are oscillators, yet how often is the care put into them that someone puts into a free running oscillator? A thick piece of wire for the coil, built really strong to avoid microphonics, with temperature compensating capacitors and voltage regulation, just like in a vfo. Add a stage of isolation between the antenna and the detector, just as you'd isolate a vfo from it's load. Bypass it will, instead of saving money by having only one capacitor. Use a good sturdy variable capacitor, rather than the one you got out of the AM portable. If you built an oscillator like most regens are built, would you expect much stability? One of the neat things about solid state is that the cost of extra active components is virtually nill, in terms of actual price and in terms of space. You're not blowing the food budget to buy that single tube so you can try out the receiver you built. Look at Charles Kitchins work. Unlike when solid state first came along, he went back to the basics, read up on the early articles about regeneration, and then proceeded to try to make them better in solid state form. So you see that extra stage to isolate the detector from the antenna. You see a voltage regulator. And it will still be cheaper than that single tube receiver in the old days. I've never built a regen, but the things he puts in his receivers were things I had been thinking about if I'd wanted to build a good regen. Michael VE2BVW Article: 94177 of rec.radio.amateur.homebrew From: "David" Subject: Material for Flexible Whip antenna Message-ID: Date: Wed, 24 Aug 2005 03:45:54 GMT I am looking for the Black (Nylon,Polythene ???) tubing around 6mm OD and wall thickness of 1mm for construction of 900 MHz whip antenna. It needs to be fairly rigid as it is glued to an SMA plug. If anyone can advise what material is typically used and where I could purchase a reel of it (maybe it is even pressure tubing for pnuematics ?), it would be much appreciated. Australian source would be preferrable. Thank in advance Regards David Article: 94178 of rec.radio.amateur.homebrew From: rbean@shell.core.com (Ron Bean) Subject: Re: Desktop metal shielded PC case? Date: Wed, 24 Aug 2005 04:08:13 -0000 Message-ID: <11gnsldr4to7hd0@corp.supernews.com> References: <1116180057.598783.160160@g14g2000cwa.googlegroups.com> <11gks2kmtouq3fc@corp.supernews.com> adykes@panix.com (Al Dykes) writes: >What are you worried about? Ham and short wave fans have a legit >issue, and I guess people doing *very* high quality audio do also. > >If you don't fit in a special catagory try taking the top of a >standard PC and hold an AM and an FM radio right next to the running >PC and listen for the noise. You won't hear much. Try it again with >the lid on. I'm not worried about anything specific, but I know the manufacturers go to great lengths to pass an rfi test, and yet it seems they are solving a non-problem. I do occasionally run PCs with the covers off, but I seldom have a radio or TV on, so if I were causing any interference anywhere (eg in the apartment nextdoor) I wouldn't notice it. I've heard urban legends about early microcomputers causing interference, were they noisier or were old TVs more sensitive to it? Article: 94179 of rec.radio.amateur.homebrew From: rbean@shell.core.com (Ron Bean) Subject: Re: Desktop metal shielded PC case? Date: Wed, 24 Aug 2005 04:09:39 -0000 Message-ID: <11gnso32vif8vfa@corp.supernews.com> References: <1116180057.598783.160160@g14g2000cwa.googlegroups.com> <11gks2kmtouq3fc@corp.supernews.com> <430B29C4.7FC83D15@case.net> case_dude writes: >Just get one of the name brand pc's from a yard sale, >or thrift shop. These cases have paint inside that >helps stop the emi from getting out. I would have no problem spending money on a commercially made case, if I could find one I liked. IMHO, they all suck. Flashy plastic and poor access even with all the covers off (I didn't consider rackmount cases because I'd like it to be semi-portable). I do have one "beige box" here, but I seldom open that one, so I don't care how awkward it is to mount stuff in it. The other one I frequently swap out components and I want one that gives me better access with the covers off. I'm considering a "semi-monocoque" design with no frame. Article: 94180 of rec.radio.amateur.homebrew From: Bill Janssen Subject: Re: Stable Regen Receiver--Does it Exist?? References: <1124850656.892394.139930@f14g2000cwb.googlegroups.com> Message-ID: Date: Wed, 24 Aug 2005 04:28:01 GMT kizerian@xmission.com wrote: >I have built a few dozen regen receivers and they all seem to work well >enough on AM signals--some extremely well--but kind of fall apart when >it comes to STABLE reception of CW and SSB. > >Has anyone ever built a solid state regen that does well with CW and >SSB? If so I would love to know how you did it (I'd even share my some >of my massive collection of radio parts with you)...before I go off and >build another dozen regens. > >I have a box full of prototypes affectionately dubbed my radio reject >graveyard (or dead radio pile)...I just don't want to be up to my neck >in more prototypes before I finally get a good one. > >Seriously thinking of skipping it and building a simple DC or superhet. > >Bruce Kizerian kk7zz >www.elmerdude.com > > Figure out how to make a stable oscillator at the frequency you are interested in. Then convert that design to a regen. I think that is as close as you will get. Bill K7NOM Article: 94181 of rec.radio.amateur.homebrew From: "Mal" References: Subject: Re: Material for Flexible Whip antenna Message-ID: Date: Wed, 24 Aug 2005 05:22:50 GMT http://www.mobileone.com.au/antenna/default.htm "David" wrote in message news:S3SOe.8590$FA3.4667@news-server.bigpond.net.au... >I am looking for the Black (Nylon,Polythene ???) tubing around 6mm OD > and wall thickness of 1mm for construction of 900 MHz whip antenna. > It needs to be fairly rigid as it is glued to an SMA plug. > > If anyone can advise what material is typically used and where I could > purchase > a reel of it (maybe it is even pressure tubing for pnuematics ?), it would > be much > appreciated. Australian source would be preferrable. > > Thank in advance > > Regards > > David > Article: 94182 of rec.radio.amateur.homebrew From: "Charles Brabham" References: <11gnb7a3c1ifq9f@corp.supernews.com> Subject: Re: HamPoll.Com Message-ID: Date: Wed, 24 Aug 2005 06:50:48 GMT "Roy Lewallen" wrote in message news:11gnb7a3c1ifq9f@corp.supernews.com... >I associate a .com web site extension as having a commercial, for-profit >purpose. Asking for people to register and leave information about personal >preferences makes it look an awful lot like you're collecting data to sell >for marketing purposes. If that's not the purpose of your commercial >enterprise, I suggest that you state clearly what the purpose is, how you >make your money, and why people need to register in order to leave their >opinions. If it's a non-profit enterprise, I suggest you get an .org >extension, and clearly state on the site that it's not for profit. > > Roy Lewallen, W7EL Did you see any ads there at HamPoll, Einstien? We do not hold ourselves responsible for the associations that pop up in some people's minds from time to time. - They've got a million of them, and who could keep up with them all? ( Or give a hoot ) If you are convinced that HamPoll.Com is part of some kind of commercial conspiracy, your best bet would be to move on, go find something else to wring your hands over. Charles Brabham, N5PVL Director: USPacket http://www.uspacket.org Admin: HamBlog.Com http://www.hamblog.com ---------- HamPoll.Com http://www.hampoll.com ---------- DigiBlog http://www.uspacket.org/digiblog/ Article: 94183 of rec.radio.amateur.homebrew From: "Charles Brabham" References: <7%MOe.689$mH.39@fed1read07> Subject: Re: HamPoll.Com Message-ID: Date: Wed, 24 Aug 2005 06:50:48 GMT "Caveat Lector" wrote in message news:7%MOe.689$mH.39@fed1read07... > You will probably lose half your readers by asking them to register > > I don't register for anything > > And I get very little spam > > Sorry > Nothing to be sorry about. Anonymous polling does not return accurate results. Instead you get: Poll stuffing. SPAMBOT polling. multiple votes from sicko clowns. various other forms of cheating that add up to bogus results. The guys who would only vote anonymous are no big loss. We don't feel bad about our missing your anonymous vote - and neither should you... Anonymous votes are worse than useless. Registration before voting is fairly universal around the world - in relation to voting activity that is of any significance. If you want your vote to count and are not ashamed of your own opinion, you should have no trouble registering to vote in our polls. Charles Brabham, N5PVL Director: USPacket http://www.uspacket.org Admin: HamBlog.Com http://www.hamblog.com ---------- HamPoll.Com http://www.hampoll.com ---------- DigiBlog http://www.uspacket.org/digiblog/ Article: 94184 of rec.radio.amateur.homebrew From: "Charles Brabham" References: Subject: Re: HamPoll.Com Message-ID: Date: Wed, 24 Aug 2005 06:52:39 GMT "Allodoxaphobia" wrote in message news:slrndgnm5i.22nr.bit-bucket@shell.config.com... > On Tue, 23 Aug 2005 21:21:44 GMT, Charles Brabham wrote: >> HamPoll is here in order to give amateurs a chance to speak for >> themselves, >> and in time to provide reasonably accurate and significant polling data >> on a >> variety of issues related to the amateur radio service. > > Hell, that's what I thought usenet was for... I never did find much polling data on usenet. - Just a bunch of guys discussing stuff, some of whom might or might not be hams. Charles Brabham, N5PVL Director: USPacket http://www.uspacket.org Admin: HamBlog.Com http://www.hamblog.com ---------- HamPoll.Com http://www.hampoll.com ---------- DigiBlog http://www.uspacket.org/digiblog/ Article: 94185 of rec.radio.amateur.homebrew From: "David" References: Subject: Re: Material for Flexible Whip antenna Message-ID: Date: Wed, 24 Aug 2005 10:42:51 GMT Mal, I cannot see on the web page where they mention the material used for the Whip Radome ? They also don't seem to sell any tubing. Can you advise me which page they advertise the tubing ? Thanks "Mal" wrote in message news:KuTOe.8690$FA3.7066@news-server.bigpond.net.au... > http://www.mobileone.com.au/antenna/default.htm > "David" wrote in message > news:S3SOe.8590$FA3.4667@news-server.bigpond.net.au... >>I am looking for the Black (Nylon,Polythene ???) tubing around 6mm OD >> and wall thickness of 1mm for construction of 900 MHz whip antenna. >> It needs to be fairly rigid as it is glued to an SMA plug. >> >> If anyone can advise what material is typically used and where I could >> purchase >> a reel of it (maybe it is even pressure tubing for pnuematics ?), it >> would be much >> appreciated. Australian source would be preferrable. >> >> Thank in advance >> >> Regards >> >> David >> > > Article: 94186 of rec.radio.amateur.homebrew From: W8LNA Subject: Re: HamPoll.Com References: <11gnb7a3c1ifq9f@corp.supernews.com> Message-ID: Date: Wed, 24 Aug 2005 12:26:55 GMT Charles Brabham wrote: > "Roy Lewallen" wrote in message > news:11gnb7a3c1ifq9f@corp.supernews.com... > >>I associate a .com web site extension as having a commercial, for-profit >>purpose. Asking for people to register and leave information about personal >>preferences makes it look an awful lot like you're collecting data to sell >>for marketing purposes. If that's not the purpose of your commercial >>enterprise, I suggest that you state clearly what the purpose is, how you >>make your money, and why people need to register in order to leave their >>opinions. If it's a non-profit enterprise, I suggest you get an .org >>extension, and clearly state on the site that it's not for profit. >> >>Roy Lewallen, W7EL > > > Did you see any ads there at HamPoll, Einstien? > > We do not hold ourselves responsible for the associations that pop up in > some people's minds from time to time. - They've got a million of them, and > who could keep up with them all? ( Or give a hoot ) > > If you are convinced that HamPoll.Com is part of some kind of commercial > conspiracy, your best bet would be to move on, go find something else to > wring your hands over. So when someone makes a suggestion you're going to insult them? If they don't want to register they're ashamed of something? Out of the many web site on the internet this is how you solicit participants? Friendly suggestions: Allow unregistered readers to vote and list how many voters are registered or not along with your poll data so those reading the polls can make their own conclusions. Fix your web page so it doesn't open a new window when I click on 'Forums' (Mozilla Firefox 1.0.6 browser), if I want it opened in a new window or tab I can do that myself. Keep in mind what associations the majority of potential readers may make and try to draw the line of what you'll act on and what you won't not so far over on your side of things. You'll need a lot of subscribers to get polling that has any statistical significance, I also suggest you treat people with some basic respect if you want this thing to get off the ground, Einstein himself may have been eccentric but he was also polite. You need us to make this work, so far you haven't shown that we need you at all. Galen, W8LNA Article: 94187 of rec.radio.amateur.homebrew From: "John A" Subject: Re: HP 8558B Analyser Problem - Help Needed Date: Wed, 24 Aug 2005 14:22:05 +0100 Message-ID: References: Hi Pete, 1. The sweep is in automatic. 2. The phenomena is as described - 0MHz peak then flat, noiseless, sloping sections - at all bandwidth settings. I see where you're coming from - but I'm not that wet behind the ears! In fact, when you centre the 0MHz peak on the screen, the slope of the noiseless sections either side are the same - i.e., from left to right, the sweep is noise into -4MHz, then a slope DOWNWARDS to just before the 0MHz peak, then the true, quite narrow, 0MHz peak, then a further sloping downwards section to +4MHz - where normal behaviour is resumed. A bit like this (typed, and intended to be views in Plain Text) | | _______ | |_______ ######## --------______ --------______############ __ Note that this Spectrum Analyser worked well both where I used to work AND for two to three years after I rescued it from the firm's scrap pile and brought it home to my shack - i.e. what it is doing now is definitely NOT what I have been used to it doing! My guess was that the problem might be overloading due to mixer mis-balance - if all of the mixers are supposed to be balanced, that is. Uncoupling either input to the mixer which converts down from 304 to 21.4MHz gets rid of the 0MHz peak, which I take to be proof that that mixer is balanced, but I've got no test gear covering above 50MHz and so I can't debug the front end of the Analyser. Does this further info help? I've been told that there are loads of Spectrum Analyser and/or HP experts in this group. John "Pete KE9OA" wrote in message news:m6KOe.127634$5N3.67339@bgtnsc05-news.ops.worldnet.att.net... > This is a dumb question, but I have to ask......................does this > only show up at the wider I.F. bandwidth settings? If so, this is normal. Do > you have the sweep set to automatic or manual mode? If you have your sweep > set to manual mode and your sweep is set too fast, this can occur. > > Pete > > "John A" wrote in message > news:defa29$fit$1@newsg1.svr.pol.co.uk... > > Hi All, > > > > My HP8558B has developed a fault. Could anyone advise? > > > > Up to about 4MHz the sweep consists of a distorted 0MHz peak then a > > sloping, > > noise-free, baseline. Above 4MHz the analyser works fine At a Reference > > Level switch setting of -30dB there is about one division of noise nad > > signal appear as expected > > > > The distortion of the 0MHz peak and the slope of the 0 to 4MHz section of > > the sweep varies with the setting of the Reference Level Switch but the > > actual gain settings seem to be correct, once you are above 4MHz. Also odd > > single spikes appear in this region at different Ref Level settings > > > > Anything else you need to know? > > > > TIA > > > > John > > > > > > "Pete KE9OA" wrote in message news:m6KOe.127634$5N3.67339@bgtnsc05-news.ops.worldnet.att.net... > This is a dumb question, but I have to ask......................does this > only show up at the wider I.F. bandwidth settings? If so, this is normal. Do > you have the sweep set to automatic or manual mode? If you have your sweep > set to manual mode and your sweep is set too fast, this can occur. > > Pete > > "John A" wrote in message > news:defa29$fit$1@newsg1.svr.pol.co.uk... > > Hi All, > > > > My HP8558B has developed a fault. Could anyone advise? > > > > Up to about 4MHz the sweep consists of a distorted 0MHz peak then a > > sloping, > > noise-free, baseline. Above 4MHz the analyser works fine At a Reference > > Level switch setting of -30dB there is about one division of noise nad > > signal appear as expected > > > > The distortion of the 0MHz peak and the slope of the 0 to 4MHz section of > > the sweep varies with the setting of the Reference Level Switch but the > > actual gain settings seem to be correct, once you are above 4MHz. Also odd > > single spikes appear in this region at different Ref Level settings > > > > Anything else you need to know? > > > > TIA > > > > John > > > > > > Article: 94188 of rec.radio.amateur.homebrew From: John Ferrell Subject: Re: Stable Regen Receiver--Does it Exist?? Message-ID: References: <1124850656.892394.139930@f14g2000cwb.googlegroups.com> Date: Wed, 24 Aug 2005 13:21:20 GMT May be I should not post before the second cup of coffee in the morning, but it seems to me that stable regeneration nets out to a Q-Multiplier. Don't let me discourage your activities, you would not be the first to find a new life for an old method. Personally, I find myself thinking about Parametric amplifiers a good bit these days... On 23 Aug 2005 19:30:56 -0700, kizerian@xmission.com wrote: >I have built a few dozen regen receivers and they all seem to work well >enough on AM signals--some extremely well--but kind of fall apart when >it comes to STABLE reception of CW and SSB. > >Has anyone ever built a solid state regen that does well with CW and >SSB? If so I would love to know how you did it (I'd even share my some >of my massive collection of radio parts with you)...before I go off and >build another dozen regens. > >I have a box full of prototypes affectionately dubbed my radio reject >graveyard (or dead radio pile)...I just don't want to be up to my neck >in more prototypes before I finally get a good one. > >Seriously thinking of skipping it and building a simple DC or superhet. > >Bruce Kizerian kk7zz >www.elmerdude.com Article: 94189 of rec.radio.amateur.homebrew From: "Charles Brabham" References: <7%MOe.689$mH.39@fed1read07> Subject: Re: HamPoll.Com Message-ID: Date: Wed, 24 Aug 2005 13:51:42 GMT "Highland Ham" wrote in message news:U5edna9RFf9T3pHeRVnyvA@pipex.net... >> Registration before voting is fairly universal around the world - in >> relation to voting activity that is of any significance. If you want your >> vote to count and are not ashamed of your own opinion, you should have no >> trouble registering to vote in our polls. >> >> Charles Brabham, N5PVL > ==================== > Charles , Whatever your objectives with this web site , I shall NEVER > participate ,registered or non-registered ,because I find this type of > polling a useless activity , it is doing something just for the sake of > doing ,without having any positive / constructive end result, it is just > taking up bandwidth. > > Frank GM0CSZ / KN6WH That's cool. If we had to wait until everybody agreed on everything, we wouldn't get much done, would we? You can take your insulting tone though, and stick it where the sun don't shine. Charles Brabham, N5PVL Director: USPacket http://www.uspacket.org Admin: HamBlog.Com http://www.hamblog.com ---------- HamPoll.Com http://www.hampoll.com ---------- DigiBlog http://www.uspacket.org/digiblog/ Article: 94190 of rec.radio.amateur.homebrew From: "Charles Brabham" References: <11gnb7a3c1ifq9f@corp.supernews.com> Subject: Re: HamPoll.Com Message-ID: Date: Wed, 24 Aug 2005 13:58:15 GMT "W8LNA" wrote in message news:jIZOe.555$Xo3.333@news01.roc.ny... > Charles Brabham wrote: >> "Roy Lewallen" wrote in message >> news:11gnb7a3c1ifq9f@corp.supernews.com... >> >>>I associate a .com web site extension as having a commercial, for-profit >>>purpose. Asking for people to register and leave information about >>>personal preferences makes it look an awful lot like you're collecting >>>data to sell for marketing purposes. If that's not the purpose of your >>>commercial enterprise, I suggest that you state clearly what the purpose >>>is, how you make your money, and why people need to register in order to >>>leave their opinions. If it's a non-profit enterprise, I suggest you get >>>an .org extension, and clearly state on the site that it's not for >>>profit. >>> >>>Roy Lewallen, W7EL >> >> >> Did you see any ads there at HamPoll, Einstien? >> >> We do not hold ourselves responsible for the associations that pop up in >> some people's minds from time to time. - They've got a million of them, >> and who could keep up with them all? ( Or give a hoot ) >> >> If you are convinced that HamPoll.Com is part of some kind of commercial >> conspiracy, your best bet would be to move on, go find something else to >> wring your hands over. > > So when someone makes a suggestion you're going to insult them? When they are couched in an insulting tone, you betcha I will. > > Friendly suggestions: Tell you what: I'll run my web-site and you run yours, if you have one. > > You need us to make this work, so far you haven't shown that we need you > at all. I don't need whiners here on usenet, that's for sure. Nobody is obligated to like the services I offer. The fact that I do offer such services does not obligate me to stand still for abuse. Or dumb advice, well-intentioned or otherwise. Have a nice day! :-p Charles Brabham, N5PVL Director: USPacket http://www.uspacket.org Admin: HamBlog.Com http://www.hamblog.com ---------- HamPoll.Com http://www.hampoll.com ---------- DigiBlog http://www.uspacket.org/digiblog/ Article: 94191 of rec.radio.amateur.homebrew From: "Charles Brabham" References: <11gnb7a3c1ifq9f@corp.supernews.com> Subject: Re: HamPoll.Com Message-ID: Date: Wed, 24 Aug 2005 14:10:23 GMT "Roy Lewallen" wrote in message news:11gnb7a3c1ifq9f@corp.supernews.com... >I associate a .com web site extension as having a commercial, for-profit >purpose. Asking for people to register and leave information about personal >preferences makes it look an awful lot like you're collecting data to sell >for marketing purposes. If that's not the purpose of your commercial >enterprise, I suggest that you state clearly what the purpose is, how you >make your money, and why people need to register in order to leave their >opinions. If it's a non-profit enterprise, I suggest you get an .org >extension, and clearly state on the site that it's not for profit. > > Roy Lewallen, W7EL The data is constantly on public display, for anybody to do anything they want to with. That makes it kinda hard to sell... Think it through. - Especially before making ignorant, ugly accusations on usenet, OM. Charles Brabham, N5PVL Director: USPacket http://www.uspacket.org Admin: HamBlog.Com http://www.hamblog.com ---------- HamPoll.Com http://www.hampoll.com ---------- DigiBlog http://www.uspacket.org/digiblog/