Article: 96709 of rec.radio.amateur.homebrew From: "xpyttl" References: Subject: Re: SN 602, SA602 etc. for an R4C Message-ID: Date: Tue, 7 Mar 2006 08:08:00 -0500 The NE602 was an old part. The product was bought by another company (Signetics?) who renamed it SA602, but kept the rights to the name NE602 so sometimes you still find an NE602. Worse yet, the NE/SA 612 is a little more widely available and somewhat cheaper -- sometimes a lot cheaper. It is the same part with a little different set of QC tests, so for any imaginable application, all 4 parts are the same thing. If you were doing some military application there might be a slight advantage to the 602 over the 612, but even that isn't clear from the spec sheets. Usually (but not always) if you find an NE part it will be "old stock". Sometimes the 602 will be a few cents more than a 612, other times it will be 2 or 3 times the price, although it's only a couple buck part so paying double isn't going to break the bank, anyway. The NE602 was widely used in a lot of projects, and still is. Hams got used to calling it an NE602 so the name stuck, even though an actual NE602 is hard to find anymore and the alternatives at least as good. Guys who build lots of receivers have a drawer marked NE602 that probably contains more SA612's than NE602's. .. "Andy Bullington" wrote in message news:pdqdnX7ohepKxZHZnZ2dnUVZ_s6dnZ2d@comcast.com... > I'm really interested in building the product detector and second and > third mixers for my R4C as described in the recent QEX article. My > question is (and please pardon my ignorance) in 2 places an SN 602 IC is > called for but I can find no trace of such a component anywhere. Is the SA > 602 or NE 602 the same? I'm a ham but a musician by trade and learning > this stuff as I go. Thanks in advance. > Andy W1AWB > Article: 96710 of rec.radio.amateur.homebrew From: Allison-nospam@nouce.bellatlantic.net Subject: Re: R4C QEX project tansistors Message-ID: References: Date: Tue, 07 Mar 2006 13:27:05 GMT On Tue, 7 Mar 2006 07:44:16 -0500, "Andy Bullington" wrote: >I've found all the parts for this project except for the ZTX330 and 2N5950 >transistors which seem to be extinct. The 2N5950 is available at some >commercial venues but I only need one of em. Are there readily available >subs for these? I'm getting a little discouraged. Thanks. > Andy W1AWB > I'd think the 40673 mosfets harder to find though easy to substitute. The ZTX330 is generic and a 2n3904, 2n2222 or similar should work fine. For the 2n5950 I'd use a MPF102, 2n3819 or J310 fet as those are easy to get. The transistors used are in non critical circuits so substitutions should easily work. Generally speaking the transistors and IC used reflects those available to the author and reasonable substitutions will work with no degradation. The only parts that require care are the MAV-11 MIMICs and the SBL-3 as they helps define many of the modified recievers desired characteristics. Allison Article: 96711 of rec.radio.amateur.homebrew Message-ID: <440d9f24$0$14888$9b4e6d93@newsread2.arcor-online.net> From: Ralf Ballis Subject: Re: Remote Car Battery Voltage Monitoring Date: Tue, 07 Mar 2006 15:53:49 +0100 References: Robert Green wrote: > Anyone have ideas or sources for remotely monitoring an infrequently used > car's 12V battery to make sure it didn't go dead from simple attrition? Don't know about ready to use products. They sell some cellphone remote module by some electronic stores. It could by connected to alarm system and other surveillance device or circuit. Regards, Ralf -- www.omnibusclub.de Erfinder des Abgasturboladers Dr. Alfred J. Büchi: "Die Abgase, deren noch inne-wohnende Energie bis dahin vergeudet wurde ..." Article: 96712 of rec.radio.amateur.homebrew From: gwatts Subject: Re: Remote Car Battery Voltage Monitoring References: Message-ID: Date: Tue, 07 Mar 2006 15:43:57 GMT You might not need to get that fancy, try something like http://www.baproducts.com/sm831.htm just put it on the dashboard, plug it in, and stop worrying. Look around a little, that was the first link my search found, they may be available elsewhere for less. FrankW wrote: > Justr get one of these > > http://www.vdcelectronics.com/camping.htm > > Robert Green wrote: > >> Anyone have ideas or sources for remotely monitoring an infrequently used >> car's 12V battery to make sure it didn't go dead from simple attrition? Article: 96713 of rec.radio.amateur.homebrew From: "Joel Kolstad" Subject: Picket-fenced ground gias next to microstrip traces Date: Tue, 7 Mar 2006 09:19:40 -0800 Message-ID: <120rg6otjsdv574@corp.supernews.com> I've noticed that various data sheet application circuits for items such as RF switches, amplifiers, etc. (e.g., http://www.hittite.com/product_info/product_specs/switches/hmc349lp4c.pd f ) use what I would call "microstrip traces surrounded by a ground pour 'guard' to reduce coupling to adjacent traces." Someone else, however, has suggested that the application circuits were really designed as co-planar waveguides (with grounds). Anyone else want to venture an opinion? For a 62.5 mil board, a 50 ohm microstrip's width is around 115 mils using FR-4 (k=4.7). Using TxLine 2003, for a CPW w/ground I have to reduce the gap to ~50 mils before the signal trace width reduces ~10% to ~104 mils. I take this to imply that there's not a lot of coupling between the signal trace and the copper pours (instead of the ground plane) until the gap width is comparable to the board thickness. In general, my impression has been that the use of copper flooding is more to provide isolation between adjacent traces than to change the form of the transmission line, and the use of the picket fenced vias was to insure that a large chunk of copper pour didn't suddently turn into a resonator. Does that sound correct? ---Joel Kolstad Article: 96714 of rec.radio.amateur.homebrew From: "Mike Andrews" Subject: Re: Picket-fenced ground gias next to microstrip traces Date: Tue, 7 Mar 2006 17:50:30 +0000 (UTC) Message-ID: References: <120rg6otjsdv574@corp.supernews.com> Joel Kolstad wrote: > I've noticed that various data sheet application circuits for items such as RF > switches, amplifiers, etc. (e.g., > http://www.hittite.com/product_info/product_specs/switches/hmc349lp4c.pd f ) > use what I would call "microstrip traces surrounded by a ground pour 'guard' > to reduce coupling to adjacent traces." Someone else, however, has suggested > that the application circuits were really designed as co-planar waveguides > (with grounds). Anyone else want to venture an opinion? Their Application Note 17 ("Design techniques enhance isolation in switch assemblies") talks explicitly about grounded-coplanar-waveguide techniques. The evaluation boards for the "349" switches certainly appear to use the CPW techniques discussed in AppNote 17, including closely-spaced plated thru-holes to tie top and bottom ground planes together. > For a 62.5 mil board, a 50 ohm microstrip's width is around 115 mils using > FR-4 (k=4.7). Using TxLine 2003, for a CPW w/ground I have to reduce the gap > to ~50 mils before the signal trace width reduces ~10% to ~104 mils. I take > this to imply that there's not a lot of coupling between the signal trace and > the copper pours (instead of the ground plane) until the gap width is > comparable to the board thickness. > In general, my impression has been that the use of copper flooding is more to > provide isolation between adjacent traces than to change the form of the > transmission line, and the use of the picket fenced vias was to insure that a > large chunk of copper pour didn't suddently turn into a resonator. Does that > sound correct? If by "picket fenced vias" you mean the projections outward from the signal vias on the evaluation boards, I take those to be the plated thru-holesdiscussed in AppNote 17. Are you seeing something I'm not? _Interesting_ gadgets. Awfully small, but interesting; may have to ask for samples and eval boards. -- Mike Andrews, W5EGO mikea@mikea.ath.cx Tired old sysadmin Article: 96715 of rec.radio.amateur.homebrew From: "Steve Nosko" Subject: Re: Biasing amps for linear service -- design question Date: Tue, 7 Mar 2006 11:30:27 -0600 Message-ID: References: <1141495434.077634.71180@p10g2000cwp.googlegroups.com> wrote in message news:1141495434.077634.71180@p10g2000cwp.googlegroups.com... > I've been looking at simple circuits used to bias > solid state, common emitter, BJT amps for linear > service. A very common technique is to use the > voltage drop (.7 V) across a forward biased diode to > bias the base of the final. See EMRFD page 2.37. > > But when you do this, don't you end up with a very, > very low emitter voltage (whatever you have on the > base minus the drop across the base-emitter junction)? > With a voltage divider bias network you can arrange to > have several volts on the base, a couple of volts on > the emitter, and then use the emitter resistor to set > the Idc. But using the diode scheme, you just don't > have much voltage on the emitter to play with. > > Am I missing something here? > > Doug DeMaw has a 1 watt linear amp in the Feb 1997 > issue of CQ that uses this circuit. In this circuit > he has 7 ohms between the emitter and ground. I > measure .022Von the emitter -- that would yield an Idc > of only 2 milliamps. > > DeMaw also discusses this biasing arrangement on page > 128 of his QRP Notebook. > > Is the answer that we are biasing for Class AB and not > class A and the higher level of Idc is not needed? > Also, in most of these circuits, they the emitters are > connected directly to ground -- that would definitely > increase Idc. > > 73 from London > M0HBR N2CQR CU2JL > http://www.qsl.net/n2cqr > For RF power over just a few watts, it is very hard to get good bypassing...VERY difficult..actually impossible. You want to make a good, low impedance (inductance) path in the emitter. Impedances in RF power stages are in the sub ohm range and anything can cause trouble. The divider/emitter resistor method is only good at lower levels. The diode bias is set up to give the correct class AB bias, just like in a tube. The circuit is designed to give the correct bias. I believe the circuit also must provide a low DC impedance to the part, but I better ask some of the PA gurus around here to be sure. The diode has to be in thermal contact with the part to get tracking over temp. Ideally it should be "on the die" because there is a thermal lag and differential between the die and anywhere outside. It is possible to put a very small resistor in the collector supply and use an active feedback to control the bias, but that is complex. 73, Steve, K9DCI Article: 96716 of rec.radio.amateur.homebrew From: "Steve Nosko" Subject: Re: Permeability of steel filled epoxy? Date: Tue, 7 Mar 2006 11:35:31 -0600 Message-ID: References: <1141425652.682734.94300@e56g2000cwe.googlegroups.com> My guess is that it will be very non-repeatable. Not being an RF designed product, it isn't tracked in manufacture and can vary..lots. Guess #1a It can vary depending how it is formed...do particles touch and support eddy currents or not. Guess #2. It is a poor material for any RF work. Guess #3 It is messy to cast into a usable form. $0.02 Maybe that's $0.08 73, Steve, K,9.D;C'I wrote in message news:1141425652.682734.94300@e56g2000cwe.googlegroups.com... > Anyone have a guess as to the permeability of steel filled epoxy? > > Was sort of wondering what would happen if one tried to make RF > inductor or transformer (torroid, etc) cores out of the stuff... > > with care, it can even reproduce threads, so tuneable slugs might be > possible. > > It's available as putty in tube form in many hardware stores, and as a > castable liquid from industrial supply catalogs - though obviously if > ordering something from a non-local supplier, it might as well be a > proper core from Amidon. > > (and yes, I may go ahead and try it... soon as I get my workbench set > back up to the point where I could build something to measure the > results) > Article: 96717 of rec.radio.amateur.homebrew From: "Joel Kolstad" Subject: Re: Picket-fenced ground gias next to microstrip traces Date: Tue, 7 Mar 2006 10:12:29 -0800 Message-ID: <120rjaj6aaeagf5@corp.supernews.com> References: <120rg6otjsdv574@corp.supernews.com> Hi Mike, Thanks for the response -- I'll go and read that app note. > If by "picket fenced vias" you mean the projections outward from the > signal vias on the evaluation boards I mean all the vias going from the top side copper to the ground plane. Viewed from the side -- and with a little imagination -- those vias kinda look like a picket fense. OK, maybe not so much, but I *have* heard this term before; I'm not making it up myself! :-) From razrbruce AT gmail.com Sat Mar 11 23:44:53 EST 2006 Article: 96718 of rec.radio.amateur.homebrew Reply-To: "BruceR" From: "BruceR" Newsgroups: comp.home.automation,rec.autos.misc,rec.radio.amateur.homebrew References: Subject: Re: Remote Car Battery Voltage Monitoring Lines: 40 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-RFC2646: Format=Flowed; Original Message-ID: Date: Tue, 07 Mar 2006 19:30:59 GMT NNTP-Posting-Host: 24.161.149.73 X-Complaints-To: abuse@rr.com X-Trace: tornado.socal.rr.com 1141759859 24.161.149.73 (Tue, 07 Mar 2006 11:30:59 PST) NNTP-Posting-Date: Tue, 07 Mar 2006 11:30:59 PST Organization: Road Runner High Speed Online http://www.rr.com Path: news0.isis.unc.edu!news1.isis.unc.edu!elk.ncren.net!logbridge.uoregon.edu!newscon06.news.prodigy.com!prodigy.net!news-east.rr.com!news.rr.com!news-wrt-01.rdc-nyc.rr.com!news-wrt-01.ohiordc.rr.com!news-server.columbus.rr.com!cyclone2.kc.rr.com!news2.kc.rr.com!tornado.socal.rr.com.POSTED!53ab2750!not-for-mail Xref: news0.isis.unc.edu comp.home.automation:162447 rec.autos.misc:237214 rec.radio.amateur.homebrew:96718 I have a car at a second home that sits for months without use and a marine battery that sits in a small sailboat to power a bilge pump and lights. For the boat, I found a flexible, waterproof solar panel at West Marine that keeps the battery fully charged. In 4 years I've never had to charge it with anything else. For the car, I use a Battery Tender Jr. to keep the battery "ready-to-start" and it works well. Rather than monitoring the battery's condition remotely, in both cases I just use the chargers and never have to worry about it. If the car has a lighter socket, power outlet that's always on you can just plug it in that way. http://tinyurl.com/k9w56 shows the Battery Tender Jr. and you can buy it for under $30 at places like Pep Boys. > Anyone have ideas or sources for remotely monitoring an infrequently > used car's 12V battery to make sure it didn't go dead from simple > attrition? > > Ideally, I want some sort of contact closure when voltage drops below > a certain point. I want to sent that information wirelessly to a > base unit inside the house that would flash, beep, and then call my > cellphone and say "Dad's wheelchair van needs recharging." > > What I would like to do is hijack a wireless thermometer - the > thermistor probe should be able to read voltage with a few > modifications to the probe end. The thermometer base station has an > "alarm on temperature" feature that could, with a little > recalibration, serve to monitor dropping voltage and to beep when it > dropped below a threshold I would set. With any luck, I could get > it to read 100 degrees when the battery was fully charged and 0 > degrees when depleted. Not sure there would be linearity along the > scale, though! > > Another thought would be some sort of docking cradle on the front > bumper that allowed feeding a charging current to the car without the > need for connecting charging cables or a charger that can be dragged > down the street for several blocks until the car manages to run over > it (the reason why I just don't leave the sucker plugged in all the > time for him!). Article: 96719 of rec.radio.amateur.homebrew From: TomJ Subject: Schematics Message-ID: Date: Tue, 07 Mar 2006 13:35:34 -0600 Looking for something else, I found this site. Sources for kits. lots of schematics, theory. Ranging from hobbyist to engineer. www.pcs-electronics.com/en/guide.php?sub=NewSchematics#Motor I've spent about four hours (so far) and am amazed at how much info is there. Looking at the requests for info here, this site has covered most, if not all topics. TomJ Article: 96720 of rec.radio.amateur.homebrew From: "B Fuhrmann" Subject: Re: Remote Car Battery Voltage Monitoring Date: Tue, 7 Mar 2006 18:14:12 -0600 Message-ID: <120s91r12q0i771@corp.supernews.com> References: "Robert Green" wrote ... > Another thought would be some sort of docking cradle on the front bumper > that allowed feeding a charging current to the car without the need for > connecting charging cables or a charger that can be dragged down the > street > for several blocks until the car manages to run over it (the reason why I > just don't leave the sucker plugged in all the time for him!). With the low current needed for a trickle charger, just wire it to a cigarette lighter plug and drape the wire across the steering wheel. It would be hard to drive off without noticing it. Another solution would be to wire a 3 wire 1/4" phone plug to it and a jack to the car in an appropriate location where it will unplug if you drive away. Connect the 3rd terminal to get power from the car's jack and use it as a safety circuit to shut off the charger if it is not connected. A lot easier, more reliable, and cheaper than monitoring the voltage and calling your cell phone. -- Bill Fuhrmann Article: 96721 of rec.radio.amateur.homebrew From: Russ Subject: Re: R4C QEX project tansistors Message-ID: References: Date: Wed, 08 Mar 2006 01:22:20 GMT On Tue, 07 Mar 2006 13:27:05 GMT, Allison-nospam@nouce.bellatlantic.net wrote: >On Tue, 7 Mar 2006 07:44:16 -0500, "Andy Bullington" > wrote: > >>I've found all the parts for this project except for the ZTX330 and 2N5950 >>transistors which seem to be extinct. The 2N5950 is available at some >>commercial venues but I only need one of em. Are there readily available >>subs for these? I'm getting a little discouraged. Thanks. >> Andy W1AWB >> > >I'd think the 40673 mosfets harder to find though easy to substitute. > >The ZTX330 is generic and a 2n3904, 2n2222 or similar should >work fine. For the 2n5950 I'd use a MPF102, 2n3819 or J310 fet as >those are easy to get. The transistors used are in non critical >circuits so substitutions should easily work. > >Generally speaking the transistors and IC used reflects those >available to the author and reasonable substitutions will work >with no degradation. > >The only parts that require care are the MAV-11 MIMICs and the SBL-3 >as they helps define many of the modified recievers desired >characteristics. > >Allison These folks have a decent supply of 40673s. They advertise being "Leaders on the trailing edge of technology". I don't know what their onesy - twosey policy is, having never done business with them. http://www.rocelec.com/ Also, search for "NTE" equivalents. Russ Article: 96722 of rec.radio.amateur.homebrew From: dplatt@radagast.org (Dave Platt) Subject: Re: SN 602, SA602 etc. for an R4C Date: Wed, 08 Mar 2006 02:09:35 -0000 Message-ID: <120sf6v3ftnf801@corp.supernews.com> References: <1141782661.482281.64720@i39g2000cwa.googlegroups.com> In article <1141782661.482281.64720@i39g2000cwa.googlegroups.com>, wrote: >Speaking of the NE602 - the old one - I have a question... > >Is my chip dead, or is 40 meters dead? Can't say anything about the health of your chip. There are times when 40 meters is dead, or pretty weak. There are other days when it's fine. Sunspot numbers have been quite low lately. The Western States Noontime Net on 40 meters was fairly weak today and was weak yesterday... the net controls commented that propagation was horrible. For a couple of days before that, propagation was excellent and signals were just booming in. >Lots of domestic AM broadcast interference eventually tamed, but then >only shortware broadcast received at these frequencies (ie, tunes like >AM should with a direct conversion receiver) - no ham CW. I do >remember from way back when that I found the novice 40m band useless in >the evenings and would hang out on 15m then instead. Is that still >true right now? I don't ever hear much in the old 40-Novice band segment. There's enough foreign-broadcast interference after dark these days to drive most ham activity out of the 7100-7300 frequencies. There's usually some CW pipping away down at the very low end of 40 almost any time I tune around to check. The phone segment on 40 is usually quite active during the day, if the band conditions aren't too horrible, since most of the foreign broadcast interference is heavily attenuated. My impression is that 15 is as dead as a doornail after sunset these days. -- Dave Platt AE6EO Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! Article: 96723 of rec.radio.amateur.homebrew From: Subject: kpg-43 schematic pls Date: 08 Mar 2006 06:09:17 GMT Message-ID: <440e750d$0$3994$c3e8da3@news.astraweb.com> Article: 96724 of rec.radio.amateur.homebrew From: Allison-nospam@nouce.bellatlantic.net Subject: Re: R4C QEX project tansistors Message-ID: References: Date: Wed, 08 Mar 2006 12:47:52 GMT On Wed, 08 Mar 2006 01:22:20 GMT, Russ wrote: >On Tue, 07 Mar 2006 13:27:05 GMT, >Allison-nospam@nouce.bellatlantic.net wrote: > >>On Tue, 7 Mar 2006 07:44:16 -0500, "Andy Bullington" >> wrote: >> >>>I've found all the parts for this project except for the ZTX330 and 2N5950 >>>transistors which seem to be extinct. The 2N5950 is available at some >>>commercial venues but I only need one of em. Are there readily available >>>subs for these? I'm getting a little discouraged. Thanks. >>> Andy W1AWB >>> >> >>I'd think the 40673 mosfets harder to find though easy to substitute. >> >>The ZTX330 is generic and a 2n3904, 2n2222 or similar should >>work fine. For the 2n5950 I'd use a MPF102, 2n3819 or J310 fet as >>those are easy to get. The transistors used are in non critical >>circuits so substitutions should easily work. >> >>Generally speaking the transistors and IC used reflects those >>available to the author and reasonable substitutions will work >>with no degradation. >> >>The only parts that require care are the MAV-11 MIMICs and the SBL-3 >>as they helps define many of the modified recievers desired >>characteristics. >> >>Allison > >These folks have a decent supply of 40673s. They advertise being >"Leaders on the trailing edge of technology". I don't know what their >onesy - twosey policy is, having never done business with them. >http://www.rocelec.com/ > >Also, search for "NTE" equivalents. I didn't say you cant get them only that they are getting scarce. Me I will not pay $5US for a transistor I used to get back in the early 80s for under $1. Fortunatly there are vendors of new parts. Of course the dualgate fet in many cases can be replaced with a cascode pair of Jfets. With MPF102s and the like inexpensively available thats a good path. Allison Article: 96725 of rec.radio.amateur.homebrew From: ricknj10@hotmail.com (Rick) Subject: Re: R4C QEX project tansistors Message-ID: <440eea0e.49291046@news.optonline.net> References: Date: Wed, 08 Mar 2006 14:36:20 GMT Hi Andy, I don't know if you want to do any experimenting. If you do, one thing to consideris to not use a 602 as the product detector in that conversion. I have done it last month and it worked ok but I didn't really see any difference in the performance of the receiver. the original product detector, being made from diodes, was a low impedance device. Consider replacing it with a DBM, since you already have a low impedance source of 50 KHz LO. If you make the conversion the authors did you end up moving the components to use the oscillator in the 602 and end up having to attenuate the IF signal coming into the 602 also. My only concern is the frequency response of the packaged DBMs - they are speced at 500 KHz as the lower frequency limit. Maybe using them at 50 KHz is pushing them too far. I DID make the power supply and audio amp mods. The audio amp, especially, is extremely crude. I can't believe Drake actually built their audio amp that way (Class A with a transformer). I used a simple little 380 IC mounted right next to the volume control and it works fantastic. I haven't done the earlier mixer mods yet, but so far the improvements in heat reduction and consequent VFO stability are worthwhile. Rick K2XT Article: 96726 of rec.radio.amateur.homebrew From: Eamon Skelton Subject: Re: R4C QEX project tansistors Message-ID: References: Date: Wed, 08 Mar 2006 15:26:44 +0000 On Wed, 08 Mar 2006 09:56:37 -0500, Andy Bullington wrote: > Boy have I learned a lot on this little search...thanks to you guys. NTE > lists the NTE 222 as equivalent to the 40673 and Parts Express has them > for just under 9 bucks each. RF Parts has the 40673 for about $7. "Russ" Thats a high price for a dual-gate MOSFET. You can buy more modern devices for a much lower price. The BF981 and BF961 make excellent RF and IF amplifiers. If you shop around, you can get them for less than a dollar. Surface mount devices like the the BF996S are well under a dollar, even from notoriously expensive suppliers like Maplin. http://www.maplin.co.uk 73, Ed. EI9GQ. -- Linux 2.6.15 Remove 'X' to reply by e-mail. Yes, my username really is: nospam Article: 96727 of rec.radio.amateur.homebrew From: "AAA RF Products" Subject: FS: RF Connectors & Adapters Message-ID: <1QFPf.2813$ld2.2727@fed1read11> Date: Wed, 8 Mar 2006 11:00:28 -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) No minimum order. No handling charges. Article: 96728 of rec.radio.amateur.homebrew From: dplatt@radagast.org (Dave Platt) Subject: Re: Low distortion HF rcv preamp? Date: Wed, 08 Mar 2006 19:56:40 -0000 Message-ID: <120udnohvdp8s4e@corp.supernews.com> References: <1141847168.969764.25480@v46g2000cwv.googlegroups.com> >Hi all, > >I'm interested in finding out what the state of the art is in low >distortion preamps for HF receiving systems. Anyone out there have >pointers to reasonable designs for a preamp with input IP3 above, say, >+55dBm, with amplifier power requirements limited to half a watt, and a >noise figure better than 10dB? IP2 should also be high--greater than >+100dBm--though it may be acceptable to have a lower IP2 as frequency >increases. I certainly hope you're going to be willing to accept an estimated/extrapolated rating for that last figure, and don't require an actual performance test! :-) -- Dave Platt AE6EO Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! Article: 96729 of rec.radio.amateur.homebrew From: "Mike Andrews" Subject: Re: Low distortion HF rcv preamp? Date: Wed, 8 Mar 2006 20:09:06 +0000 (UTC) Message-ID: References: <1141847168.969764.25480@v46g2000cwv.googlegroups.com> <120udnohvdp8s4e@corp.supernews.com> Dave Platt wrote: >>Hi all, >> >>I'm interested in finding out what the state of the art is in low >>distortion preamps for HF receiving systems. Anyone out there have >>pointers to reasonable designs for a preamp with input IP3 above, say, >>+55dBm, with amplifier power requirements limited to half a watt, and a >>noise figure better than 10dB? IP2 should also be high--greater than >>+100dBm--though it may be acceptable to have a lower IP2 as frequency >>increases. > I certainly hope you're going to be willing to accept an > estimated/extrapolated rating for that last figure, and don't require > an actual performance test! Somehow this .sig file seems doubly appropriate here: > >> .... from S-30 to ... > >Now _there's_ a signal report you don't often enter in your log... > True... most of us are too busy running away from the electric arcs > and dodging the ball lightning :-) -- Dave Platt, in r.r.a.h -- Mike Andrews, W5EGO mikea@mikea.ath.cx Tired old sysadmin Article: 96730 of rec.radio.amateur.homebrew From: Skipp sent this Subject: yahoo rf amplifiers group Date: Wed, 8 Mar 2006 22:25:25 +0000 (UTC) Message-ID: Just a 50 cent plug to let you folks know about the Yahoo RF Amplifiers Group, please feel free to join in if you have an interest in rf and audio amplifiers. Building - construction - operation - design - operation, you get the idea. Hope to see you there... http://groups.yahoo.com/group/rfamplifiers/ cheers, skipp Article: 96731 of rec.radio.amateur.homebrew Date: Thu, 09 Mar 2006 01:35:44 +0200 From: Risto Tiilikainen Subject: Re: Schematics References: Message-ID: <440f695b$0$25356$39db0f71@news.song.fi> TomJ kirjoitti: > Looking for something else, I found this site. > Sources for kits. lots of schematics, theory. > > Ranging from hobbyist to engineer. > > www.pcs-electronics.com/en/guide.php?sub=NewSchematics#Motor > > I've spent about four hours (so far) and am amazed at how much info is > there. > Looking at the requests for info here, this site has covered most, if > not all topics. > > TomJ > > > Hi Tnx for link Forwarded it to our domestic news pages 73, Risto OH2BT Article: 96732 of rec.radio.amateur.homebrew From: "Stargatesg1" References: <440f695b$0$25356$39db0f71@news.song.fi> Subject: Re: Schematics Message-ID: Date: Wed, 08 Mar 2006 23:38:08 GMT Great site! Thanks for the link. "Risto Tiilikainen" wrote in message news:440f695b$0$25356$39db0f71@news.song.fi... > TomJ kirjoitti: > > Looking for something else, I found this site. > > Sources for kits. lots of schematics, theory. > > > > Ranging from hobbyist to engineer. > > > > www.pcs-electronics.com/en/guide.php?sub=NewSchematics#Motor > > > > I've spent about four hours (so far) and am amazed at how much info is > > there. > > Looking at the requests for info here, this site has covered most, if > > not all topics. > > > > TomJ > > > > > > > Hi > > Tnx for link > Forwarded it to our domestic news pages > > 73, Risto OH2BT Article: 96733 of rec.radio.amateur.homebrew From: Ken Scharf Subject: Re: Question about 4-400 tube socket/mounting References: Message-ID: Date: Wed, 08 Mar 2006 20:27:40 -0500 DOUGLAS SNOWDEN wrote: > I have seen 3-500Z tubes mounted in the johnson ceramic sockets. The Heath > SB-220 uses them. > Will the 4-400 tube handle the airflow the same way? Usually you see the air > system sockets used so that the air will flow up through the bottom. Will > the filament connections remain solid in a 275 ceramic socket with a muffin > fan blowing across the tube? > ? I have seen the sockets raised a bit so that the filaments get cooling. > Just wondering if the 4-400 would work that way as well? Any experience > with this? > > Doug N4IJ > > I built a linear using two 4-400's. I used the Johnson ceramic sockets (square type) that did have some holes which lined up with the ones in the bottom of the tubes. I mounted the sockets under the chassis FLUSH with the bottom of the chassis. I pressurized the chassis with a 4" boxer type fan mounted under the tube sockets. This fan was one of the high speed types that could move lots of air. I also mounted a pair of the same type of fans next to the bottles on the top of the chassis, blowing air from outside into the chassis past the tubes. The air flow went through the base holes and around the glass bottle. This is similar to the way the SB220 linear was build, as with many HB amps. The tubes did not suffer any heat effects, while the pair ran near the legal limit. BTW, 4-400's work ok in GG, but they like more HV than their triode counterparts. While a pair of 3-500's work well with 2500v, the 4-400 likes more like 3300-3500v to get the same output and IM figures. So your tank circuit will have more "L" and less "C". Article: 96734 of rec.radio.amateur.homebrew From: "Harold E. Johnson" References: <1141847168.969764.25480@v46g2000cwv.googlegroups.com> <120udnohvdp8s4e@corp.supernews.com> <1141849107.473175.197940@j33g2000cwa.googlegroups.com> Subject: Re: Low distortion HF rcv preamp? Message-ID: Date: Thu, 09 Mar 2006 03:57:35 GMT With the performance I'm looking for, it means > detecting distortion products down more than 100dB from the inputs, but > that's something I'm up for. I do need to work on a little better > combiner for my sources, though, so they don't intermodulate before > going into the D.U.T.. I can get fairly close to the sort of > performance I asked about with some modern op amps, but not across the > full HF band. > > Cheers, > Tom Hi Tom. Look for Anzac combiners, we used them to measure +55 dBm Ip3 on the VMP-4 amplifiers and didn't get measureable IMD from them at +6 dBm in. John Thorpe (AOR 7030 fame) assures us that the simple MCL PSC 2-1 is blameless to 0 dBm. http://www.aoruk.com/comments.htm > I had been having what appeared to be hybrid IMD using some Merrimac combiners, which totally cleared up by using DDS sources instead of low noise HP 8640's modified to remove the levelling crosstalk. The DDS's do NOT talk to each other and less attenuation for isolation is required. Gimmee a hint on your "modern" op-amps. Split PSU's I presume? Regards W4ZCB Article: 96735 of rec.radio.amateur.homebrew From: SamSvL Subject: Re: FS: RF Connectors & Adapters Date: 9 Mar 2006 09:03:32 GMT Message-ID: References: <1QFPf.2813$ld2.2727@fed1read11> "AAA RF Products" wrote in news:1QFPf.2813 $ld2.2727@fed1read11: > 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) > > No minimum order. > > No handling charges. > > No shipping to Europe? Article: 96736 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: how to wind 10mH inductor for AF diplexer? Date: Thu, 09 Mar 2006 01:15:58 -0800 Message-ID: <120vsifssu92cc4@corp.supernews.com> References: <1141892464.866553.169310@p10g2000cwp.googlegroups.com> aadu.adok@gmail.com wrote: > hello, > > After completing my AF amp and BFO, I'm in the process of doing IF/BFO > diode ring mixer. > I understood that it is a good idea (or even mandatory?) to follow DBM > with a diplexer. > > I found one from http://www.qrp.pops.net/dip2.htm > > My question is: how on earth should I wind those 10mH inductors? My > calculations show that I should wind 487 turns on FT37-43 (which is > obviously impossible), or 437 turns on FT50-43 (which is hard..but > should be possible). > > Any other ideas how to make 10mH inductors for AF diplexer? > > thanks! The best solution is a pot core. A molded inductor is ok, too, but you might have trouble with hum pickup -- the voltage produced by any field coupled into the inductor will be amplified by the whole audio chain. A pot core is self-shielding like a toroid. Roy Lewallen, W7EL Article: 96737 of rec.radio.amateur.homebrew From: Allison-nospam@nouce.bellatlantic.net Subject: Re: how to wind 10mH inductor for AF diplexer? Message-ID: <1bd012hvdoja2gelk6dooh6o1t79tacbtn@4ax.com> References: <1141892464.866553.169310@p10g2000cwp.googlegroups.com> Date: Thu, 09 Mar 2006 14:07:03 GMT On 9 Mar 2006 00:21:04 -0800, aadu.adok@gmail.com wrote: >hello, > >After completing my AF amp and BFO, I'm in the process of doing IF/BFO >diode ring mixer. >I understood that it is a good idea (or even mandatory?) to follow DBM >with a diplexer. > >I found one from http://www.qrp.pops.net/dip2.htm > >My question is: how on earth should I wind those 10mH inductors? My >calculations show that I should wind 487 turns on FT37-43 (which is >obviously impossible), or 437 turns on FT50-43 (which is hard..but >should be possible). The only reasonable way is useing pot cores. I cheated with the issue for that situation. Since the recovered signal is in audio I followed the DBM with a 6 db 50 ohm pad with a low pass filter after that. Far simplier and the 6DB is easy to make up with IF gain (if really needed). It works well and the pad assures the DBM of a decent match even if the output of the pad is shorted or open. Saves a big inductor at a low level stage with the usual hum and microphonics problems. If band pass filtering in the audio range is needed it's easy to add after the first audio stages. Allison Article: 96738 of rec.radio.amateur.homebrew From: Allison-nospam@nouce.bellatlantic.net Subject: Re: True a.m. Message-ID: References: Date: Thu, 09 Mar 2006 14:13:36 GMT On Thu, 9 Mar 2006 08:09:59 -0500, "jack" wrote: >I saw this post on rec.audio.tubes, but it is more germaine to RRAH -- how >to build a modulation transformer: > >http://www.amwindow.org/tech/htm/tvtomod.htm > Tron('HLR) is a excellent source of info on AM and how to get good AM. The use of power transformers and large chokes to get both good AM solving the problem of where to get BIG modulator iron and how to use it are covered in the discussion. FYI: BIG plate modulators are Kilowatt class amplifiers at audio. Allison Article: 96739 of rec.radio.amateur.homebrew From: "Reg Edwards" Subject: Re: how to wind 10mH inductor for AF diplexer? Date: Thu, 9 Mar 2006 14:46:33 +0000 (UTC) Message-ID: References: <1141892464.866553.169310@p10g2000cwp.googlegroups.com> <1141909682.254268.164810@e56g2000cwe.googlegroups.com> "Tim Shoppa" wrote in message news:1141909682.254268.164810@e56g2000cwe.googlegroups.com... > aadu.adok@gmail.com wrote: > > My question is: how on earth should I wind those 10mH inductors? > > In years past I would pick up 88mH/22mH and like "phone company" > toroids at hamfests etc. > > My understanding is that these were used to compensate for line loading > in long phone wire runs. > > Windings were either used as-is (if 88 mH or 22mH was appropriate) or > were removed and rewound. =========================================== 88 mH loading coils were used on 300-3,600 Hz phone circuits ever since around the years 1900 to 1910. Spaced every 2000 yards in 542-pair underground, long distance cables between phone exchanges and towns and cities, they were an international standard of loading. Countless millions were manufactured. 88 mH coils must have outnumbered all coils of all other values of inductance put together. Originally the core was a bundle of soft iron wires but in the 1950's after 50 years they changed to ferrites. 22 mH coils were another popular value. They were used on "music" circuits. Spaced every 500 yards the frequency range was 100-15,000 Hz. At one time used on a network between radio broadcast studios and transmitters. Coils had to be removed to make cables suitable for carrier telephony and then digital transmission. But there must be millions still in use around the World. ---- Reg. Article: 96740 of rec.radio.amateur.homebrew From: "Joel Kolstad" Subject: Re: Picket-fenced ground gias next to microstrip traces Date: Thu, 9 Mar 2006 12:36:17 -0800 Message-ID: <12114fu63q9bief@corp.supernews.com> References: <120rg6otjsdv574@corp.supernews.com> <1141905706.649458.178340@u72g2000cwu.googlegroups.com> "Saandy , 4Z5KS" wrote in message news:1141905706.649458.178340@u72g2000cwu.googlegroups.com... > ,,,,,,this is PRECISELY what a CPW is NOT! It's a "coplanar waveguide with ground plane." This seems more popular than strict CPWs, as far as I can tell. Article: 96741 of rec.radio.amateur.homebrew From: ISRAEL FAGBEMI Subject: BECOME A DOT.COM MILLIONAIRE WITH ONLY $5.99Cents or $1K. Message-ID: Date: Thu, 9 Mar 2006 15:50:19 -0500 Article: 96742 of rec.radio.amateur.homebrew From: "Steve Nosko" Subject: Re: Picket-fenced ground gias next to microstrip traces Date: Thu, 9 Mar 2006 16:51:27 -0600 Message-ID: References: <120rg6otjsdv574@corp.supernews.com> This appears to be a blend of co-planar and microstrip. Co-planar has no ground plane, that is, everything is in one plane thus the name "co-planar". A "microstrip-like" line is flanked by two ground surfaces and there is no ground plane under it. Like this ---- - ---- Microstrip is a flat line over a ground plane. Like this - ----------- The vias along both sides of this "CPW" T-line appear to be used to constrain the fields and The Vias most certainly must enter into the characteristic impedance equation since the spacing to the line is so close. Therefore the line must be narrower than pure coplanar. I was part of a program to design a family of his same type of switch on GaAs, back in the early 90's and the co-planar line was used. 73, Steve, k9DCi "Mike Andrews" wrote in message news:dukh55$u1$1@puck.litech.org... > Joel Kolstad wrote: > > I've noticed that various data sheet application circuits for items such as RF > > switches, amplifiers, etc. (e.g., > > http://www.hittite.com/product_info/product_specs/switches/hmc349lp4c.pd f ) > > use what I would call "microstrip traces surrounded by a ground pour 'guard' > > to reduce coupling to adjacent traces." Someone else, however, has suggested > > that the application circuits were really designed as co-planar waveguides > > (with grounds). Anyone else want to venture an opinion? > > Their Application Note 17 ("Design techniques enhance isolation in > switch assemblies") talks explicitly about grounded-coplanar-waveguide > techniques. The evaluation boards for the "349" switches certainly > appear to use the CPW techniques discussed in AppNote 17, including > closely-spaced plated thru-holes to tie top and bottom ground planes > together. > > > For a 62.5 mil board, a 50 ohm microstrip's width is around 115 mils using > > FR-4 (k=4.7). Using TxLine 2003, for a CPW w/ground I have to reduce the gap > > to ~50 mils before the signal trace width reduces ~10% to ~104 mils. I take > > this to imply that there's not a lot of coupling between the signal trace and > > the copper pours (instead of the ground plane) until the gap width is > > comparable to the board thickness. > > > In general, my impression has been that the use of copper flooding is more to > > provide isolation between adjacent traces than to change the form of the > > transmission line, and the use of the picket fenced vias was to insure that a > > large chunk of copper pour didn't suddently turn into a resonator. Does that > > sound correct? > > If by "picket fenced vias" you mean the projections outward from the > signal vias on the evaluation boards, I take those to be the plated > thru-holesdiscussed in AppNote 17. > > Are you seeing something I'm not? > > _Interesting_ gadgets. Awfully small, but interesting; may have to > ask for samples and eval boards. > > -- > Mike Andrews, W5EGO > mikea@mikea.ath.cx > Tired old sysadmin Article: 96743 of rec.radio.amateur.homebrew From: "Joel Kolstad" Subject: Re: Picket-fenced ground gias next to microstrip traces Date: Thu, 9 Mar 2006 17:35:23 -0800 Message-ID: <1211m0nk6dleu25@corp.supernews.com> References: <120rg6otjsdv574@corp.supernews.com> Hi Steve, "Steve Nosko" wrote in message news:duqbhg$dv$2@engnntp2.cig.mot.com... > This appears to be a blend of co-planar and microstrip. The freebie program TxLine 2003 "knows" about (can compute dimensions from impedances, etc.) CPWs, CPWs w/ground planes, microstrips, etc. and you can get some feel for how wide you can make a CPW w/GP gap before it's effectively a microstrip -- when the signal trace widths became nearly the same. I dug up some more Hittite app notes, and it does seem as though they're clearly playing in the CPW w/GP arena. They do point out that a major downside is that you eat up a fair number of routing channels with all those vias. > I was part of a program to design a family of his same type of switch on > GaAs, back in the early 90's and the co-planar line was used. I'm surprised just how much "chaos" there seems to be in the RF IC (primarily MMIC) arena... there are plenty of old standbys like Hittite, MA/COM (now Tyco), and Watkins-Johnson, but they seem to have a pretty well stocked "stable" of components and only introduce a handful of new ones every year. On the other hand, the little guys and mergers like Freecell, California Eastern, and RF Micro Devices seems to have lots of good parts that suddenly get discontinued, product introductions that turn out to be vaporware (a friend claims that RFMD is great for this -- their data sheets are really part of their marketing department, with specs drawn strictly from simulation -- they initially quote everyone a lead time of, say, 3 months, and if they don't get orders for large quantities, they just never fab the chip in the first place), and otherwise seem a little difficult to rely on at times! ---Joel Article: 96744 of rec.radio.amateur.homebrew From: ISRAEL FAGBEMI Subject: BECOME A DOT.COM MILLIONAIRE WITH ONLY $5.99Cents or $1K. Message-ID: Date: Thu, 9 Mar 2006 22:25:07 -0500

BECOME A DOT.COM MILLIONAIRE
Invest $1,000. Get back up to $3,000 a day ,$100,000 monthly. for 1 year. Silent Partners. Do no work.
www.vosar.net
416-903-5685
775-333-1125
invest@vosar.net

Article: 96745 of rec.radio.amateur.homebrew From: "Joel Kolstad" Subject: What do you call these devices? Date: Fri, 10 Mar 2006 01:55:19 -0800 Message-ID: <1212j86qjoboec6@corp.supernews.com> At work we have these "do-hickeys" that look like a regular "tee" connector. However, it's meant to be used such that a signal passes through the "top" of the tee while the "leg" of the tee "picks off" the signal some 10dB or so down from the input. (The insertion loss is some fraction of a dB.) The pick off seems to just be a wire tip coming out of the backside of the connector (just capacitively coupled?); there's an adjustable sleeve that lets you position this tip closer or further from the through line; moving it closer creates better coupling, but also tends to decrease frequency flatness. The cool thing is that all ports drive 50 ohms, and the pick-off's output is surprisingly flat over more than an octave. Any ideas? It's definitely not constructed the way I'd build a directional coupler -- even though it performs a somewhat similar function --, nor a "magic tee" (although I've only seem magic tees in the form of waveguides and transformer-based affairs for HF). Thanks, ---Joel Kolstad Article: 96746 of rec.radio.amateur.homebrew From: "Samuel Hunt" Subject: 7/8 wave antennas? Date: Fri, 10 Mar 2006 10:27:03 +0000 (UTC) Message-ID: Do these things actually work? I have a 2m 5/8 wave that I use mobile, and am told that a 7/8 wave will give more gain. Can anyone confirm? I'm told also that I can just take the 5/8 wave out and stick the 7/8 wave in and it will load up. I doubt this personally - can anyone tell me if it needs more or less inductance? Any ideas where to get loading coils from in the UK? Thanks all! Sam M1FJB Article: 96747 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: 7/8 wave antennas? Date: Fri, 10 Mar 2006 02:48:31 -0800 Message-ID: <1212mc1l4k6eeb4@corp.supernews.com> References: Samuel Hunt wrote: > Do these things actually work? > > I have a 2m 5/8 wave that I use mobile, and am told that a 7/8 wave will > give more gain. Can anyone confirm? Well, the 7/8 wave vertical has about 1-1/2 dB more gain than a 5/8 wave, if you measure that gain at the angle at which each antenna's radiation is greatest. The problem is that while the 5/8 wave antenna radiates most strongly toward the horizon (assuming a large ground plane), the 7/8 wave radiates almost nothing at the horizon. Its radiation is maximum at about 40 degrees above the horizon. Great for contacting aircraft at a particular distance, but very poor for general line-of-sight and repeater use. At the horizon, the gain of the 7/8 wave is about 20 dB less than that of the 5/8 wave. This assumes a large ground plane, and relative performance will vary depending on the frequency and installation. But you can count on the 5/8 being much better than the 7/8. > I'm told also that I can just take the 5/8 wave out and stick the 7/8 wave > in and it will load up. I doubt this personally - can anyone tell me if it > needs more or less inductance? Considering the lousy radiation pattern, I can't see why anyone would want to use a 7/8 wave vertical. Roy Lewallen, W7EL Article: 96748 of rec.radio.amateur.homebrew From: "Dale Parfitt" References: <1212mc1l4k6eeb4@corp.supernews.com> Subject: Re: 7/8 wave antennas? Message-ID: Date: Fri, 10 Mar 2006 13:21:15 GMT "Roy Lewallen" wrote in message news:1212mc1l4k6eeb4@corp.supernews.com... > Samuel Hunt wrote: >> Do these things actually work? >> >> I have a 2m 5/8 wave that I use mobile, and am told that a 7/8 wave will >> give more gain. Can anyone confirm? > > Well, the 7/8 wave vertical has about 1-1/2 dB more gain than a 5/8 wave, > if you measure that gain at the angle at which each antenna's radiation is > greatest. The problem is that while the 5/8 wave antenna radiates most > strongly toward the horizon (assuming a large ground plane), the 7/8 wave > radiates almost nothing at the horizon. Its radiation is maximum at about > 40 degrees above the horizon. Great for contacting aircraft at a > particular distance, but very poor for general line-of-sight and repeater > use. At the horizon, the gain of the 7/8 wave is about 20 dB less than > that of the 5/8 wave. This assumes a large ground plane, and relative > performance will vary depending on the frequency and installation. But you > can count on the 5/8 being much better than the 7/8. > >> I'm told also that I can just take the 5/8 wave out and stick the 7/8 >> wave in and it will load up. I doubt this personally - can anyone tell me >> if it needs more or less inductance? > > Considering the lousy radiation pattern, I can't see why anyone would want > to use a 7/8 wave vertical. > > Roy Lewallen, W7EL This line of reasoning (a longer wavelength is better) harks back to the days of mobile CB antennas. Manufacturers would advertise their mobile whips as being 1/2 wave, 5/8, 3/4 even 1 wavelength. None were even close to being that long physically. The claim was that they had that much wire wound up in them. One manufacturer placed a layer of aluminum foil over a portion of the winding allowing them to claim 1/2 wavelength ( of wire) and still be 1/4 wavel resonant. In addition, the I squared R of the shorted coil improved their BW. Dale W4OP Article: 96749 of rec.radio.amateur.homebrew From: "Bob" Subject: Re: What do you call these devices? Date: Fri, 10 Mar 2006 07:28:53 -0600 Message-ID: <1212voorvaeqh5f@corp.supernews.com> References: <1212j86qjoboec6@corp.supernews.com> "Joel Kolstad" wrote in message news:1212j86qjoboec6@corp.supernews.com... > At work we have these "do-hickeys" that look like a regular "tee" connector. > We called these an "isolated T" when I worked in 2 way radio and used them to check for receiver desense in a repeater. The through ports were placed in the line to the antenna, while the isolated port was connected to a signal generator on the receiver frequency. We would disable the repeat function, turn the generator amplitude up until we got some value of quieting in the receiver, and then re-enable the repeat function. If the duplexer was mistuned (or was a cheap notch only type), or you had a dirty transmitter, you would hear the noise level in the received signal rise. The isolated port was needed so you did not transmit into the generator and cause the magic smoke contained therein to issue forth. ;) Some repeaters were very quiet (Motorola for one). Others (brands will not be mentioned but they had horns on them) often showed several dB of desense. I spent many an hour trying to finesse a sow's ear into a silk purse by tuning for minimum desense. Ahhhhhhhhh those were the days..... ;) :) Bob WB0POQ Article: 96750 of rec.radio.amateur.homebrew Message-ID: <441199C5.90801@invalid.invalid> From: Doug Smith W9WI Subject: Re: Remote Car Battery Voltage Monitoring References: <120s91r12q0i771@corp.supernews.com> <4KGdnV1p9NFAsIzZnZ2dnUVZ_tudnZ2d@rcn.net> Date: Fri, 10 Mar 2006 15:22:56 GMT Robert Green wrote: > This is probably the most appropriate solution. I especially like your idea > of wiring it so that if it is accidentally disconnected via a "drive off" > that there won't be a live 12VDC plug lying in the driveway. I was also A possibly easier alternative would be to use a different connector. Like the Anderson Powerpoles. This too would disconnect via "drive-off", but it wouldn't accidentially short the 12V charger if the plug happened to land on a piece of metal. Yet you wouldn't have to worry about the loose plug on the van end shorting the battery either. -- Doug Smith W9WI Pleasant View (Nashville), TN EM66 http://www.w9wi.com Article: 96751 of rec.radio.amateur.homebrew From: Frank Olson Subject: Re: Remote Car Battery Voltage Monitoring References: <4KGdnSJp9NFBsIzZnZ2dnUVZ_tudnZ2d@rcn.net> Message-ID: Date: Fri, 10 Mar 2006 15:25:41 GMT Robert Green wrote: > "BruceR" wrote in message > news:TblPf.2595$pV5.325@tornado.socal.rr.com... > >>I have a car at a second home that sits for months without use and a >>marine battery that sits in a small sailboat to power a bilge pump and >>lights. For the boat, I found a flexible, waterproof solar panel at West >>Marine that keeps the battery fully charged. In 4 years I've never had >>to charge it with anything else. For the car, I use a Battery Tender Jr. >>to keep the battery "ready-to-start" and it works well. Rather than >>monitoring the battery's condition remotely, in both cases I just use >>the chargers and never have to worry about it. If the car has a lighter >>socket, power outlet that's always on you can just plug it in that way. >> http://tinyurl.com/k9w56 shows the Battery Tender Jr. and you can buy >>it for under $30 at places like Pep Boys. > > > I just bought a solar panel that plugs into the dash. We'll see if it > works. The van doesn't get a lot of sun where it's parked and the rear > windows are all heavily tinted so mounting it back there won't help much. I > may still have to go with some sort of detachable umbilical because I need > to be able to charge his scooter while it's in the van, since he still walks > from the van into the house with his cane. > > Thanks for the info. Hopefully the dash charger will do the trick. Hi Bobby: Make sure the dash charger is putting out more current than the "on board electronics" require. If, for instance, your total current draw is greater than the dash charger can supply, you're going to wind up in the same situation (dead battery). Additionally, (and at night time) the current draw on the battery is going to go back to "normal", and the charger may not be powerful enough to "keep up". I found this in a "Froogle" search: http://froogle.google.com/froogle_cluster?q=mounted+battery+chargers&pid=4854524895284469150&oid=2589900813912983575&btnG=Search+Froogle&scoring=mrd&hl=en Article: 96752 of rec.radio.amateur.homebrew From: Bob Bob Subject: Re: What does it mean to be a _REAL_ Radio Ham? The FAQ is here! References: <1142003010.363667.13530@j52g2000cwj.googlegroups.com> Message-ID: Date: Fri, 10 Mar 2006 10:01:25 -0600 Although well written Mr Plod and in some places downright excellent I think you are making assumptions about what AR "really is" and imprinting your own views as being the gospel. Mind you there is nothing wrong with that and invites positive discussion. Things could also be very different in G land but my experiences are different. Just be careful presenting this to outsiders as being something other than your personal view. You seem to dwell on the "difference" or "better than" that AR has over other radio services. Since this and the associated CB bashing that pervades this NG on a regular basis I guess you are in good company. You could roughly divide radio use into "CB related" "Amateur related" and anything else like public services and commercial. You then concentrate yet again on the CB vs AR debate. In my view there has always been a blurring about what use CB vs AR is about. It's a double set of bell shape curves that overlap in a lot of ways. The first thing you have to do when judging behaviour and use is to throw away the ideal world of what the law that was passed on the topic actually menas or is interpreted to mean. Such arguments as "go get your license and we'll let you experiment" are irrelevent in the light of what ACTUALLY happens in the real world. The law is suppose to reflect the community attitude and beliefs rather than force its direction. There will never be enough resources to enforce a law if a large percentage of those that affect it, ignore it! Yes there are undesirable people on both CB and AR bands. This however is a subset of people generally. You can be obnoxious just as easily without a radio as having one. What grade of license you have is irrelevent and it continues to happen. There is a lot of social conversion on AR, husbands and wives use it as a contact medium, people exchange weather reports and QSL cards. Those that go on desert treks use it as a backup emergency system. There is a lot on inane chatter about all types of things simply to hear one self speak! Are these within the technical pursuit of the hobby? CB'ers experiment with antenna systems and propagation, do technically illegal things to their radios in the PURSUIT of making them work better. In the process they learn and enjoy their hobby like an AR user does. Yes the technical standard isnt likely to be as high but it is there. There is NO brick wall seperating the use of the respective services. It is very blurred and overlaps considerably. There is no black or white view amongst most of those that use it. There are of course exceptions that dont look at the real world and try to force their own misguided views as correct. There is however a continual case of "I am better than you because I am licensed" not unlike the "keeping up with the Jones's" habit of preening in ones own nest. Unhappily though "decency" or whatever you like to call it is not just a function of radio users. Its the result of the way the world is changing or if you like a sociological problem just waiting to explode. The place is a lot unhappier, people are more willing to return to their animal instincts and anything that makes it easy to tread in your neighbours is fair game. I mean just look at this newsgroup... Apologies for this post being OT in the other groups posted Bob VK2YQA (Who is more intersted in technical pursuits) Plod's Conscience wrote: > > What is Ham Radio? > From "know code" Sat Mar 11 23:44:57 EST 2006 Article: 96753 of rec.radio.amateur.homebrew Date: Fri, 10 Mar 2006 17:15:38 +0100 From: know code Reply-To: "know code" User-Agent: Thunderbird 1.5 (Windows/20051201) MIME-Version: 1.0 Newsgroups: uk.radio.amateur,rec.radio.amateur.policy,rec.radio.amateur.homebrew Subject: Re: What does it mean to be a _REAL_ Radio Ham? The FAQ is here! References: <1142003010.363667.13530@j52g2000cwj.googlegroups.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Lines: 9 Message-ID: <4411a62a$0$71763$dbd4d001@news.wanadoo.nl> Organization: Wanadoo NNTP-Posting-Date: 10 Mar 2006 16:15:38 GMT NNTP-Posting-Host: s5591cd23.adsl.wanadoo.nl X-Trace: 1142007338 dr5.euro.net 71763 85.145.205.35:1362 X-Complaints-To: abuse@wanadoo.nl Path: news0.isis.unc.edu!news1.isis.unc.edu!elk.ncren.net!logbridge.uoregon.edu!news.tele.dk!news.tele.dk!small.news.tele.dk!newsgate.cistron.nl!news2.euro.net!postnews2.euro.net!news.wanadoo.nl!not-for-mail Xref: news0.isis.unc.edu uk.radio.amateur:267281 rec.radio.amateur.policy:257099 rec.radio.amateur.homebrew:96753 Bob Bob wrote: > The law is suppose to reflect > the community attitude and beliefs rather than force its direction. I think someone needs to tell that to the lawmakers in the UK regarding the speed limits on the motorways and the positioning of some of the fixed speed cameras which are in areas that are NOT dangerous. Article: 96754 of rec.radio.amateur.homebrew From: "Steve Nosko" Subject: Re: What do you call these devices? Date: Fri, 10 Mar 2006 11:06:24 -0600 Message-ID: References: <1212j86qjoboec6@corp.supernews.com> RF sampler. RF pick-off. RF tap-off. I don't know if there is an accepted "standard" name, but I have seen many types. They're used for just sampling RF where a wideband response isn't needed. You can inject RF also. Flat over an octave...that's interesting. The cap-tap usually will give a rising response. I forgot what a magic Tee is... 73, Steve, K9DCi "Joel Kolstad" wrote in message news:1212j86qjoboec6@corp.supernews.com... > At work we have these "do-hickeys" that look like a regular "tee" connector. > However, it's meant to be used such that a signal passes through the "top" > of the tee while the "leg" of the tee "picks off" the signal some 10dB or so > down from the input. (The insertion loss is some fraction of a dB.) The > pick off seems to just be a wire tip coming out of the backside of the > connector (just capacitively coupled?); there's an adjustable sleeve that > lets you position this tip closer or further from the through line; moving > it closer creates better coupling, but also tends to decrease frequency > flatness. The cool thing is that all ports drive 50 ohms, and the > pick-off's output is surprisingly flat over more than an octave. > > Any ideas? It's definitely not constructed the way I'd build a directional > coupler -- even though it performs a somewhat similar function --, nor a > "magic tee" (although I've only seem magic tees in the form of waveguides > and transformer-based affairs for HF). > > Thanks, > ---Joel Kolstad > > Article: 96755 of rec.radio.amateur.homebrew From: "Joel Kolstad" Subject: Re: What do you call these devices? Date: Fri, 10 Mar 2006 10:33:48 -0800 Message-ID: <1213hmd26dlvs04@corp.supernews.com> References: <1212j86qjoboec6@corp.supernews.com> "Steve Nosko" wrote in message news:dusbmg$gf9$2@engnntp2.cig.mot.com... > RF sampler. RF pick-off. RF tap-off. Great, thanks. > Flat over an octave...that's interesting. > The cap-tap usually will give a rising response. The cap was largely balancing out some really lossy cable, I think. :-) And "flat" to me is about +/-2dB in this case, which is a pretty crude definition, I expect. Article: 96756 of rec.radio.amateur.homebrew From: dplatt@radagast.org (Dave Platt) Subject: Re: What do you call these devices? Date: Fri, 10 Mar 2006 19:10:43 -0000 Message-ID: <1213jpj68rool4a@corp.supernews.com> References: <1212j86qjoboec6@corp.supernews.com> In article <1212j86qjoboec6@corp.supernews.com>, Joel Kolstad wrote: >At work we have these "do-hickeys" that look like a regular "tee" connector. >However, it's meant to be used such that a signal passes through the "top" >of the tee while the "leg" of the tee "picks off" the signal some 10dB or so >down from the input. (The insertion loss is some fraction of a dB.) The >pick off seems to just be a wire tip coming out of the backside of the >connector (just capacitively coupled?); there's an adjustable sleeve that >lets you position this tip closer or further from the through line; moving >it closer creates better coupling, but also tends to decrease frequency >flatness. The cool thing is that all ports drive 50 ohms, and the >pick-off's output is surprisingly flat over more than an octave. > >Any ideas? It's definitely not constructed the way I'd build a directional >coupler -- even though it performs a somewhat similar function --, nor a >"magic tee" (although I've only seem magic tees in the form of waveguides >and transformer-based affairs for HF). http://www.bird-electronic.com/products/product.aspx?id=115 is one example of what you're talking about, I think. It's nondirectional. Quite handy for monitoring RF (one of these plus a cheap used low-bandwidth Tek oscilloscope makes a decent HF station monitor) and for signal injection (e.g. IMD, desense testing). -- Dave Platt AE6EO Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! Article: 96757 of rec.radio.amateur.homebrew From: "From the shack of G1LVN" Subject: APRS Armageddon !!! Date: Fri, 10 Mar 2006 20:30:40 +0000 (UTC) Message-ID: http://www.g1lvn.org.uk/maps/ or if you feel like you have been effected by the rantings of "Plods Conscience" aka G4SDW please feel free to bomb the b&sta&rd to oblivion here: http://tinyurl.com/je93r Have fun... -- -- -- drei unt siebzig de M0WWS oh noes!!! It's teh --Double Whisky and Soda --!!! http://www.g1lvn.org.uk ------------------------------- -- -- -- drei unt siebzig de M0WWS oh noes!!! It's teh --Double Whisky and Soda --!!! http://www.g1lvn.org.uk ------------------------------- Article: 96758 of rec.radio.amateur.homebrew From: "wy0ohg143" References: <1142003010.363667.13530@j52g2000cwj.googlegroups.com> Subject: Re: What does it mean to be a _REAL_ Radio Ham? The FAQ is here! Message-ID: Date: Fri, 10 Mar 2006 15:29:15 -0500 "Plod's Conscience" wrote in message news:1142003010.363667.13530@j52g2000cwj.googlegroups.com... > What is Ham Radio? > > It is becoming increasingly difficult to fly the flag for > decency and for civilised behaviour in Radio Hammery. Even > the Usenet newsgroups dedicated to the cause have degenerated > into a hotbed of abusive onslaughts by those who ought to know better, If you're tired of what is going on in the Usenet groups, you're welcome to join the Ham Radio Unplugged group: http://groups.yahoo.com/group/Ham-Radio-Unplugged/ Article: 96759 of rec.radio.amateur.homebrew From: "The Magnum" Subject: Re: What does it mean to be a _REAL_ Radio Ham? The FAQ is here! Date: Fri, 10 Mar 2006 21:29:04 -0000 Message-ID: References: <1142003010.363667.13530@j52g2000cwj.googlegroups.com> <4411a62a$0$71763$dbd4d001@news.wanadoo.nl> "know code" wrote in message news:4411a62a$0$71763$dbd4d001@news.wanadoo.nl... > Bob Bob wrote: > > > The law is suppose to reflect > > the community attitude and beliefs rather than force its direction. > > I think someone needs to tell that to the lawmakers in the UK regarding > the speed limits on the motorways and the positioning of some of the > fixed speed cameras which are in areas that are NOT dangerous. Surely if the argument for the cameras was a valid one i.e. safety then the slow down lights that flash at you to reduce your speed would be 100% better than cameras which you sometimes don't even notice they are there until a week later when the intent to prosecute letter drops through your door...where does safety come in to it?, nothing to do with safety at all... just revenue makers... so I agree with you... Graham -- -.-. -... / .-. .- -.. .. --- Radio is only a Hobby. Don't let it rule your life... 73/51 - Graham, 26-Golf Charlie-19 From "know code" Sat Mar 11 23:44:58 EST 2006 Article: 96760 of rec.radio.amateur.homebrew Date: Fri, 10 Mar 2006 22:29:29 +0100 From: know code Reply-To: "know code" User-Agent: Thunderbird 1.5 (Windows/20051201) MIME-Version: 1.0 Newsgroups: uk.radio.amateur,rec.radio.amateur.policy,rec.radio.amateur.homebrew Subject: Re: What does it mean to be a _REAL_ Radio Ham? The FAQ is here! References: <1142003010.363667.13530@j52g2000cwj.googlegroups.com> <4411a62a$0$71763$dbd4d001@news.wanadoo.nl> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Lines: 19 Message-ID: <4411efba$0$71763$dbd4d001@news.wanadoo.nl> Organization: Wanadoo NNTP-Posting-Date: 10 Mar 2006 21:29:30 GMT NNTP-Posting-Host: s5591cd23.adsl.wanadoo.nl X-Trace: 1142026170 dr5.euro.net 71763 85.145.205.35:2289 X-Complaints-To: abuse@wanadoo.nl Path: news0.isis.unc.edu!news1.isis.unc.edu!arclight.uoregon.edu!wn13feed!worldnet.att.net!199.218.7.141!news.glorb.com!newsgate.cistron.nl!news2.euro.net!postnews2.euro.net!news.wanadoo.nl!not-for-mail Xref: news0.isis.unc.edu uk.radio.amateur:267332 rec.radio.amateur.policy:257118 rec.radio.amateur.homebrew:96760 The Magnum wrote: > "know code" wrote in message > news:4411a62a$0$71763$dbd4d001@news.wanadoo.nl... >> Bob Bob wrote: >> >>> The law is suppose to reflect >>> the community attitude and beliefs rather than force its direction. >> I think someone needs to tell that to the lawmakers in the UK regarding >> the speed limits on the motorways and the positioning of some of the >> fixed speed cameras which are in areas that are NOT dangerous. > > Surely if the argument for the cameras was a valid one i.e. safety then the > slow down lights that flash at you to reduce your speed would be 100% better > than cameras which you sometimes don't even notice they are there until a > week later when the intent to prosecute letter drops through your > door...where does safety come in to it?, nothing to do with safety at all... > just revenue makers... so I agree with you... Whoa, now I'm getting scared.... we actually agree on something :) Article: 96761 of rec.radio.amateur.homebrew From: "wy0ohg143" References: <1142003010.363667.13530@j52g2000cwj.googlegroups.com> <2rydnfP7uZQHfozZRVny0A@giganews.com> Subject: Re: What does it mean to be a _REAL_ Radio Ham? The FAQ is here! Message-ID: Date: Fri, 10 Mar 2006 19:28:29 -0500 "huLLy" wrote in message news:2rydnfP7uZQHfozZRVny0A@giganews.com... >> > > You're new here, aren't you? > No, I'm not new. Come join the group. Article: 96762 of rec.radio.amateur.homebrew From: "Bill Turner" Subject: Re: What does it mean to be a _REAL_ Radio Ham? The FAQ is here! References: <1142003010.363667.13530@j52g2000cwj.googlegroups.com> Message-ID: <441219e7_1@newsfeed.slurp.net> Date: 10 Mar 2006 19:29:27 -0500 What does it mean to be a real radio ham? It means you have a real ham license. Anything else, including the rest of your post, is just one person's opinion, period. Bill, W6WRT From "know code" Sat Mar 11 23:44:58 EST 2006 Article: 96763 of rec.radio.amateur.homebrew Date: Sat, 11 Mar 2006 01:37:52 +0100 From: know code Reply-To: "know code" User-Agent: Thunderbird 1.5 (Windows/20051201) MIME-Version: 1.0 Newsgroups: uk.radio.amateur,rec.radio.amateur.policy,rec.radio.amateur.homebrew Subject: Re: What does it mean to be a _REAL_ Radio Ham? The FAQ is here! References: <1142003010.363667.13530@j52g2000cwj.googlegroups.com> <441219e7_1@newsfeed.slurp.net> In-Reply-To: <441219e7_1@newsfeed.slurp.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Lines: 9 Message-ID: <44121be0$0$37857$dbd4d001@news.wanadoo.nl> Organization: Wanadoo NNTP-Posting-Date: 11 Mar 2006 00:37:52 GMT NNTP-Posting-Host: s5591cd23.adsl.wanadoo.nl X-Trace: 1142037472 dr5.euro.net 37857 85.145.205.35:3845 X-Complaints-To: abuse@wanadoo.nl Path: news0.isis.unc.edu!news1.isis.unc.edu!canoe.uoregon.edu!hammer.uoregon.edu!news.glorb.com!news2.euro.net!postnews2.euro.net!news.wanadoo.nl!not-for-mail Xref: news0.isis.unc.edu uk.radio.amateur:267346 rec.radio.amateur.policy:257123 rec.radio.amateur.homebrew:96763 Bill Turner wrote: > What does it mean to be a real radio ham? > > It means you have a real ham license. Anything else, including the rest > of your post, is just one person's opinion, period. Ah, but define a 'real ham license'. A lot of people in the UK think the M3/Foundation licence is NOT a real ham licence! Herein lies the problem! Article: 96764 of rec.radio.amateur.homebrew From: "Keith" References: <1142003010.363667.13530@j52g2000cwj.googlegroups.com> Subject: Re: What does it mean to be a _REAL_ Radio Ham? The FAQ is here! Message-ID: Date: Sat, 11 Mar 2006 02:20:25 GMT Quote 1 This excitement causes a wish to share the experience with ones fellow man, and shows itself in the gentlemanly traditions of Ham Radio. = MAN 2 Thus a Radio Ham could also hold a CB licence safe in the knowledge that such a licence says no more about him than having a land-line = MAN 3 Ham Radio licence and a CB Radio licence. To him, they are sisters-under-the-skin. Wrongly, the CB Radio Hobbyist then = MAN Sir with respect to you this is error I myself have heard on quite few occasions women with their own stations / license G3`s 4`s and 8 and have met a female Radio ham at the Canvey Island public Amatuer Radio Rally Sale who was also a stall - holder another licensed Female operater was a sales lady in an Essex amatuer radio Shop, she used to go to the same social club as me. Keith G8IFW after this, I think look how many mistakes I make, loads of them. I think i had better write better messages myself Article: 96765 of rec.radio.amateur.homebrew From: "Bill Turner" Subject: Re: What does it mean to be a _REAL_ Radio Ham? The FAQ is here! References: <1142003010.363667.13530@j52g2000cwj.googlegroups.com> <441219e7_1@newsfeed.slurp.net> <44121be0$0$37857$dbd4d001@news.wanadoo.nl> Message-ID: <44123d06_3@newsfeed.slurp.net> Date: 10 Mar 2006 21:59:18 -0500 ORIGINAL MESSAGE: know code wrote: > Bill Turner wrote: > > What does it mean to be a real radio ham? > > > It means you have a real ham license. Anything else, including > > > the rest > > of your post, is just one person's opinion, period. > > Ah, but define a 'real ham license'. A lot of people in the UK think > the M3/Foundation licence is NOT a real ham licence! Herein lies the > problem! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In this context, it doesn't matter what individuals think. What matters is what the gummint says. If they call it an "Amateur Radio License" or the equivalent, that's what it is. IF they call it a "Citizen's Band License" or the equivalent, that's also what it is. What you or I make of those is important to us but irrelevant to the original question. Bill T. Article: 96767 of rec.radio.amateur.homebrew From: Straydog Subject: Re: Question about 4-400 tube socket/mounting Date: Sat, 11 Mar 2006 02:59:06 -0500 Message-ID: References: On Sun, 5 Mar 2006, DOUGLAS SNOWDEN wrote: > I have seen 3-500Z tubes mounted in the johnson ceramic sockets. The Heath > SB-220 uses them. > Will the 4-400 tube handle the airflow the same way? Usually you see the air > system sockets used so that the air will flow up through the bottom. Will > the filament connections remain solid in a 275 ceramic socket with a muffin > fan blowing across the tube? > ? I have seen the sockets raised a bit so that the filaments get cooling. > Just wondering if the 4-400 would work that way as well? Any experience > with this? My recollection from Eimac tube spec sheets is that there must be forced-air directed upwards from the non-tube side of the tube socket and there are specifications for flow rate and pressure. Both the 3-500 and 4-400 (100 watts less plate dissipation) call for 5 v at 15 amps (IIRC) on the filament and that is a lot of heat. I don't know if the 3-500 is pushed closer to the limits on this but Eimac made a special socket (and chimney) for the 4-400 but many ARRL handbook amplifiers went for a much simpler socket. And, the Johnson Thunderbolt (I had two of them at one time) used a simple ceramic socket plus an under-chassis phonograph motor type of fan to blow air up from the bottom as well as an above chassis fan motor to blow more air around the pair of 4-400s for a 1 KW DC plate input level (with dull red cherry glow on cw carrier and a little less glow on SSB voice). Beyond that, if you are thinking of running 4-400s instead of the 3-500z, you also need to worry about bias voltage a little and you would have to resolder the socket pins because the 3-500 is a triode and the 4-400 is a tetrode (need to ground the screen, as well as control grid). But I have run 4-400s in GG in a homebrew amp in the past. > Doug N4IJ > > > Article: 96768 of rec.radio.amateur.homebrew From: "realradioham" References: <1142003010.363667.13530@j52g2000cwj.googlegroups.com> <441219e7_1@newsfeed.slurp.net> <44121be0$0$37857$dbd4d001@news.wanadoo.nl> <44123d06_3@newsfeed.slurp.net> <1142058642.385404.294790@j33g2000cwa.googlegroups.com> Subject: Re: What does it mean to be a _REAL_ Radio Ham? The FAQ is here! Date: Sat, 11 Mar 2006 11:16:14 -0000 Message-ID: <4412b264$1_4@mk-nntp-2.news.uk.tiscali.com> "Plod's Conscience" wrote in message news:1142058642.385404.294790@j33g2000cwa.googlegroups.com... > I am part of a community of like-minded individuals Say no more;c) rrh Article: 96769 of rec.radio.amateur.homebrew From: Bob Bob Subject: Re: What does it mean to be a _REAL_ Radio Ham? The FAQ is here! References: <1142003010.363667.13530@j52g2000cwj.googlegroups.com> <1142011075.318858.200330@i40g2000cwc.googlegroups.com> Message-ID: <7h4be3-3pe.ln1@p400bob.personal.cox.net> Date: Sat, 11 Mar 2006 08:47:34 -0600 You are wrong Mr Plod. Try to open your mind up just a little, learn some new things and consider that your views are based on prejudice and a very narrow view of what the world is and should be. How you live your life and what beliefs you have are your right. Dont however use them as a base frame of reference. At least you used the word "likely". That implies statistical possibility. Something that you havent applied to CB vs AR. There are also a large number of female amateurs. How do they fit into the "gentlemen" designation? Please back up your assertions with statistical analysis with a sound technical base. ie Dont use rhetoric & prove what you say is true with specific data. I do however congratulate you for not appearing racists. (ie I shouldnt be using a UK newsgroup...) Bob VK2YQA Plod's Conscience wrote: > > Then I regret that it is likely that you are a CBer, or > a CBer-Masquerading-As-A-Radio-Ham. Article: 96770 of rec.radio.amateur.homebrew From: Bob Bob Subject: Re: What does it mean to be a _REAL_ Radio Ham? The FAQ is here! References: <1142003010.363667.13530@j52g2000cwj.googlegroups.com> <441219e7_1@newsfeed.slurp.net> <1142058463.217115.95880@v46g2000cwv.googlegroups.com> Message-ID: Date: Sat, 11 Mar 2006 08:50:01 -0600 I detect some copy and pasting going on here.. Plod's Conscience wrote: > > Au contraire. > > You might have one of those, but otherwise be > a CBer-Masquerading-As-A-Radio-Ham. > > Ham Radio is a technical pursuit for gentlemen; a technical > pursuit whose rights and standards we must uphold. > > The operating hobby is known as CB Radio. > Article: 96771 of rec.radio.amateur.homebrew From: "Bill Turner" Subject: Re: What does it mean to be a _REAL_ Radio Ham? The FAQ is here! References: <1142003010.363667.13530@j52g2000cwj.googlegroups.com> <1142058294.852020.303130@j52g2000cwj.googlegroups.com> Message-ID: <4412ea51_4@newsfeed.slurp.net> Date: 11 Mar 2006 10:18:41 -0500 ORIGINAL MESSAGE: Plod's Conscience wrote: > > If you're tired of what is going on in the Usenet groups, you're > > welcome to join the Ham Radio Unplugged group: > > http://groups.yahoo.com/group/Ham-Radio-Unplugged/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Quoting from the moderator's message: "This group supports free and uncensored speech, so a moderator will not be jumping in all the time telling people how to conduct themselves as is done in other groups. Of course no ongoing "flame wars" or spam will be allowed..." In other words, you're free to say anything the moderator thinks is ok. No, thanks. Bill, W6WRT Article: 96772 of rec.radio.amateur.homebrew From: "Bill Turner" Subject: Re: What does it mean to be a _REAL_ Radio Ham? The FAQ is here! References: <1142003010.363667.13530@j52g2000cwj.googlegroups.com> <441219e7_1@newsfeed.slurp.net> <1142058463.217115.95880@v46g2000cwv.googlegroups.com> Message-ID: <4412eb4a$1_5@newsfeed.slurp.net> Date: 11 Mar 2006 10:22:50 -0500 ORIGINAL MESSAGE: Plod's Conscience wrote: > Ham Radio is a technical pursuit for gentlemen; a technical > pursuit whose rights and standards we must uphold. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I love this kind of stuff. Think how boring it would be if we were all just normal, rational beings living in the real world. Bill, W6WRT Article: 96773 of rec.radio.amateur.homebrew From: "Brian Reay" References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> Subject: Re: The smallest Baird Televisor? Message-ID: <05EQf.154$qH2.151@newsfe4-win.ntli.net> Date: Sat, 11 Mar 2006 17:49:48 GMT "Plod's Conscience" wrote in message news:1142099027.152408.11300@i39g2000cwa.googlegroups.com... > My local garage is selling laser devices that project > a straight line for just under a fiver. I wonder if these > devices (with the lens removed so that they just > produce a single spot) could be modulated to be > the light source in a Baird Televisor? > The Baird system has been superceded by more modern techniques. In fact, unless you catch up quick, you may miss out a whole generation of technical improvements that have occured since "Stookie" Brian Article: 96774 of rec.radio.amateur.homebrew From: "Samuel Hunt" Subject: Re: The smallest Baird Televisor? Date: Sat, 11 Mar 2006 18:12:35 +0000 (UTC) Message-ID: References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> No it won't How will you bend the beam? Do you propose that people look straight at it? You would need to get the beam just the right width. Just face it beanie, you're an idiot, nobody likes you, you have no life and you'd do us all a favour if you took an overdose of something fatal..... Sam M1FJB (Not scared to put my callsign to it for fear of being beaten up by the police because unlike you I am not sad and don't have violent tendencies towards the police) "Plod's Conscience" wrote in message news:1142099027.152408.11300@i39g2000cwa.googlegroups.com... > My local garage is selling laser devices that project > a straight line for just under a fiver. I wonder if these > devices (with the lens removed so that they just > produce a single spot) could be modulated to be > the light source in a Baird Televisor? > > Also, I wonder what is the smallest such Televisor > that has been produced? > Article: 96775 of rec.radio.amateur.homebrew From: Frank Turner-Smith G3VKI Subject: Re: The smallest Baird Televisor? References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> <05EQf.154$qH2.151@newsfe4-win.ntli.net> Message-ID: Date: Sat, 11 Mar 2006 18:17:46 GMT on 11/03/2006 17:49 Brian Reay said the following: > "Plod's Conscience" wrote in message > news:1142099027.152408.11300@i39g2000cwa.googlegroups.com... > >>My local garage is selling laser devices that project >>a straight line for just under a fiver. I wonder if these >>devices (with the lens removed so that they just >>produce a single spot) could be modulated to be >>the light source in a Baird Televisor? >> > > > The Baird system has been superceded by more modern techniques. In fact, > unless you catch up quick, you may miss out a whole generation of technical > improvements that have occured since "Stookie" > > Brian > > Don't disappoint him like that, Brian, the poor guy's only just discovered electric lights, and he's certainly not the brightest bulb in the box. -- ;-) 73 de Frank Turner-Smith G3VKI - mine's a pint. http://turner-smith.co.uk Article: 96776 of rec.radio.amateur.homebrew From: Nedlar Subject: Re: The smallest Baird Televisor? Date: Sat, 11 Mar 2006 18:22:50 +0000 Message-ID: <9a56129dav0l2or84mi5m6o51bf51p89in@4ax.com> References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> <05EQf.154$qH2.151@newsfe4-win.ntli.net> On Sat, 11 Mar 2006 17:49:48 GMT, "Brian Reay" wrote: > >"Plod's Conscience" wrote in message >news:1142099027.152408.11300@i39g2000cwa.googlegroups.com... >> My local garage is selling laser devices that project >> a straight line for just under a fiver. I wonder if these >> devices (with the lens removed so that they just >> produce a single spot) could be modulated to be >> the light source in a Baird Televisor? >> > >The Baird system has been superceded by more modern techniques. In fact, >unless you catch up quick, you may miss out a whole generation of technical >improvements that have occured since "Stookie" > >Brian > Don't tell Spike. He'll have to dump all his boat anchors. Article: 96777 of rec.radio.amateur.homebrew From: "Old Nicks Deputy \(first class\)" References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> Subject: Re: The smallest Baird Televisor? Message-ID: Date: Sat, 11 Mar 2006 19:24:21 GMT "Plod's Conscience" wrote in message news:1142099027.152408.11300@i39g2000cwa.googlegroups.com... > My local garage is selling laser devices that project > a straight line for just under a fiver.> I think your question should be "can anyone lend me a fiver"? HTH tox Article: 96778 of rec.radio.amateur.homebrew From: "The Magnum" Subject: Re: What does it mean to be a _REAL_ Radio Ham? The FAQ is here! Date: Sat, 11 Mar 2006 19:54:12 -0000 Message-ID: References: <1142003010.363667.13530@j52g2000cwj.googlegroups.com> <4411a62a$0$71763$dbd4d001@news.wanadoo.nl> <4411efba$0$71763$dbd4d001@news.wanadoo.nl> "know code" wrote in message news:4411efba$0$71763$dbd4d001@news.wanadoo.nl... > The Magnum wrote: > > "know code" wrote in message > > news:4411a62a$0$71763$dbd4d001@news.wanadoo.nl... > >> Bob Bob wrote: > >> > >>> The law is suppose to reflect > >>> the community attitude and beliefs rather than force its direction. > >> I think someone needs to tell that to the lawmakers in the UK regarding > >> the speed limits on the motorways and the positioning of some of the > >> fixed speed cameras which are in areas that are NOT dangerous. > > > > Surely if the argument for the cameras was a valid one i.e. safety then the > > slow down lights that flash at you to reduce your speed would be 100% better > > than cameras which you sometimes don't even notice they are there until a > > week later when the intent to prosecute letter drops through your > > door...where does safety come in to it?, nothing to do with safety at all... > > just revenue makers... so I agree with you... > > Whoa, now I'm getting scared.... we actually agree on something :) I'm sure it won't last..... >:) Graham -- -.-. -... / .-. .- -.. .. --- Radio is only a Hobby. Don't let it rule your life... 73/51 - Graham, 26-Golf Charlie-19 Article: 96779 of rec.radio.amateur.homebrew From: "The Magnum" Subject: Re: The smallest Baird Televisor? Date: Sat, 11 Mar 2006 20:11:15 -0000 Message-ID: References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> "Old Nicks Deputy (first class)" wrote in message news:FtFQf.5118$FV3.3607@newsfe2-win.ntli.net... > > "Plod's Conscience" wrote in message > news:1142099027.152408.11300@i39g2000cwa.googlegroups.com... > > My local garage is selling laser devices that project > > a straight line for just under a fiver.> > > I think your question should be "can anyone lend me a fiver"? > > HTH > > tox Why? has he been in the locals bins again and been unable to find one? Graham -- -.-. -... / .-. .- -.. .. --- Radio is only a Hobby. Don't let it rule your life... 73/51 - Graham, 26-Golf Charlie-19 From "know code" Sat Mar 11 23:45:00 EST 2006 Article: 96780 of rec.radio.amateur.homebrew Date: Sat, 11 Mar 2006 21:25:45 +0100 From: know code Reply-To: "know code" User-Agent: Thunderbird 1.5 (Windows/20051201) MIME-Version: 1.0 Newsgroups: uk.radio.amateur,rec.radio.amateur.homebrew Subject: Re: The smallest Baird Televisor? References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Lines: 18 Message-ID: <44133249$0$71982$dbd49001@news.wanadoo.nl> Organization: Wanadoo NNTP-Posting-Date: 11 Mar 2006 20:25:45 GMT NNTP-Posting-Host: s5591cd23.adsl.wanadoo.nl X-Trace: 1142108745 dr7.euro.net 71982 85.145.205.35:1067 X-Complaints-To: abuse@wanadoo.nl Path: news0.isis.unc.edu!elk.ncren.net!solaris.cc.vt.edu!news.vt.edu!news.glorb.com!newsfeeder.wxs.nl!news2.euro.net!postnews2.euro.net!news.wanadoo.nl!not-for-mail Xref: news0.isis.unc.edu uk.radio.amateur:267481 rec.radio.amateur.homebrew:96780 The Magnum wrote: > "Old Nicks Deputy (first class)" > wrote in message news:FtFQf.5118$FV3.3607@newsfe2-win.ntli.net... >> "Plod's Conscience" wrote in message >> news:1142099027.152408.11300@i39g2000cwa.googlegroups.com... >>> My local garage is selling laser devices that project >>> a straight line for just under a fiver.> >> I think your question should be "can anyone lend me a fiver"? >> >> HTH >> >> tox > > Why? has he been in the locals bins again and been unable to find one? What is your fixation with bins? Now you're introducing them to this thread as well! Do you get a sexual thrill from them or something? Article: 96781 of rec.radio.amateur.homebrew From: Bob Bob Subject: Re: What does it mean to be a _REAL_ Radio Ham? The FAQ is here! References: <1142003010.363667.13530@j52g2000cwj.googlegroups.com> <1142011075.318858.200330@i40g2000cwc.googlegroups.com> <7h4be3-3pe.ln1@p400bob.personal.cox.net> <1142092464.204794.167230@e56g2000cwe.googlegroups.com> Message-ID: Date: Sat, 11 Mar 2006 15:08:06 -0600 We'll um if that document (after "So What is Ham Radio") was the entire FAQ that you published you only dedicated the first few paragraphs to what AR is about. The rest seems to be more dedicated to what it isnt and what CB is/isnt. True, it contains some more positive references to AR but you keep needling at CB etc excessively. As far as I am concerned it would have been far more meaningful to omit any reference to CB whatsoever. I suggest you rewrite it like this, post it and see what we think. I dont disagree with your first parts. It is well written even if it is what I deem a too narrow view as to what AR is about. The bit about being gentlemanly is irrelevent to me simply because I was never bought up or lived in a class atmosphere where that term had any importance. This however is probably a language difference as I might ascribe possibly similar qualities to AR people in general. (eg willing to help, never being violent etc) Of course these qualities are dissappearing in the world generally so I suggest AR is tending to go the same way. I also take your section on competition being something that spurs us all on to bigger and better things as being a load of tripe. It is true that competition occurs, but I and many others I have talked to never see it as important at all. It is in fact the "leisure and social" side showing through along the same lines as getting excited over a football match! I experiment becasue I am interested in it, not because I want to be better than everyone. If I was a CB'er I'd take your FAQ as a slap in the face and it would drive me not to even think about taking up the AR hobby. Perhaps that is your agenda? Bob VK2YQA Plod's Conscience wrote: > > I think it is you who is, perhaps, analysing this thread > with a limited purview, and who is in the wrong. Article: 96782 of rec.radio.amateur.homebrew From: Bob Bob Subject: Re: The smallest Baird Televisor? References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> Message-ID: Date: Sat, 11 Mar 2006 15:58:41 -0600 I'll admit I dont know Baird and the Televisor stuff. (Beyond the "father of TV "stuff) Lasers though are can be pulse width modulated (PWM) to pseudo change the spot intensity. In a air comms environment they are pulsed at some "carrier" frequency and data then sits on top of that. At the RX end they have a filter at the "carrier" frequency so you dont get noise etc from other light sources. Making a picture? Had a brief think about bending light but that physics is kind of missing in my brain! I think if you used a rotating mirror array on two axis in front of the beam you might get something acceptable, be a real cow to manufacture though. Syncing would be reasonably easy (assuming a standard TV picture signal) but I think the spot would be a bit large unless you wall projected it. Colour wouldnt work BTW as the (laser) spot will be one freq only. This means any filtering or coloured mirrors wont work. Those laser pointers sound like a nice cheap way to experiment with some short haul data comms as well. Bob Plod's Conscience wrote: > > My local garage is selling laser devices that project > a straight line for just under a fiver. I wonder if these > devices (with the lens removed so that they just > produce a single spot) could be modulated to be > the light source in a Baird Televisor? > > Also, I wonder what is the smallest such Televisor > that has been produced? > Article: 96783 of rec.radio.amateur.homebrew From: Nedlar Subject: Re: The smallest Baird Televisor? Date: Sat, 11 Mar 2006 23:28:32 +0000 Message-ID: References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> On Sat, 11 Mar 2006 15:58:41 -0600, Bob Bob wrote: . > >Colour wouldnt work BTW as the (laser) spot will be one freq only. This >means any filtering or coloured mirrors wont work. For info only... John Logie Baird demonstrated colour TV in 1928. Article: 96784 of rec.radio.amateur.homebrew From: Butch Magee Subject: Re: The smallest Baird Televisor? Date: Sat, 11 Mar 2006 19:21:43 -0600 Message-ID: <1216ttactegtd01@corp.supernews.com> References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> Plod's Conscience wrote: > My local garage is selling laser devices that project > a straight line for just under a fiver. I wonder if these > devices (with the lens removed so that they just > produce a single spot) could be modulated to be > the light source in a Baird Televisor? > > Also, I wonder what is the smallest such Televisor > that has been produced? > What a Televisor? KF5DE Article: 96785 of rec.radio.amateur.homebrew From: Butch Magee Subject: Re: What do you call these devices? Date: Sat, 11 Mar 2006 19:28:17 -0600 Message-ID: <1216u9laguvli11@corp.supernews.com> References: <1212j86qjoboec6@corp.supernews.com> A "do-hickey" by anyother name is still a "do-hickey"! Therefore a "T" is a "T". No matter what "et-al" say. Butch said this! Joel Kolstad wrote: > At work we have these "do-hickeys" that look like a regular "tee" connector. > However, it's meant to be used such that a signal passes through the "top" > of the tee while the "leg" of the tee "picks off" the signal some 10dB or so > down from the input. (The insertion loss is some fraction of a dB.) The > pick off seems to just be a wire tip coming out of the backside of the > connector (just capacitively coupled?); there's an adjustable sleeve that > lets you position this tip closer or further from the through line; moving > it closer creates better coupling, but also tends to decrease frequency > flatness. The cool thing is that all ports drive 50 ohms, and the > pick-off's output is surprisingly flat over more than an octave. > > Any ideas? It's definitely not constructed the way I'd build a directional > coupler -- even though it performs a somewhat similar function --, nor a > "magic tee" (although I've only seem magic tees in the form of waveguides > and transformer-based affairs for HF). > > Thanks, > ---Joel Kolstad > > Article: 96786 of rec.radio.amateur.homebrew From: Bob Bob Subject: Re: The smallest Baird Televisor? References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> Message-ID: Date: Sat, 11 Mar 2006 20:42:53 -0600 Ok ta I remember seeing a colour wheel project some years ago whereby a B&W TV set could be used to watch colour images. The idea was to alternate the displayed filds in sync with whatever colour filter was in front at the time. I didnt make my original comment real clear either so perhaps it is worth fixing. Laser light is coherent and of one frequency - ie monochromatic. Nedlar wrote: >>Colour wouldnt work BTW as the (laser) spot will be one freq only. This >>means any filtering or coloured mirrors wont work. > > > For info only... > John Logie Baird demonstrated colour TV in 1928. > Article: 96787 of rec.radio.amateur.homebrew From: "Old Nicks Deputy \(first class\)" References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> Subject: Re: The smallest Baird Televisor? Message-ID: Date: Sun, 12 Mar 2006 06:41:38 GMT "Nedlar" wrote in message news:a6n612dfv9ofm8kavklad2u08on36bca3o@4ax.com... > On Sat, 11 Mar 2006 15:58:41 -0600, Bob Bob wrote: > > > For info only... > John Logie Baird demonstrated colour TV in 1928. Coincidently, the year of your fiftieth birthday, IIRC. tox Article: 96788 of rec.radio.amateur.homebrew From: "Jimbo..." References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> <1216ttactegtd01@corp.supernews.com> Subject: Re: The smallest Baird Televisor? Message-ID: Date: Sun, 12 Mar 2006 07:46:46 GMT >> > What a Televisor? > KF5DE ....it is a bit like an Interositer. Article: 96789 of rec.radio.amateur.homebrew From: "Brian Reay" References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> <1142146185.518102.243580@j52g2000cwj.googlegroups.com> Subject: Re: Optical Communications? RSCB Irrelevance? (Was : Re: The smallest Baird Televisor?) Message-ID: Date: Sun, 12 Mar 2006 09:22:37 GMT "Plod's Conscience" wrote in message news:1142146185.518102.243580@j52g2000cwj.googlegroups.com... > Played with it last night. > > Powered as it is by AAA cells, it seems to have > a greater power, and a greater reserve of power, than > those laserpointers powered by watch batteries. Given the relative size of AAA and "watch batteries", this is hardly surprising. > Allowing for the lens that is used to produce the > straight line beam, the spot from the end was > easily picked out on a gravestone 1/4 mile away, > thus suggesting that a tight beam is being produced. > Laser's are coherent sources, the "ASER" stands for Amplification by Stimulated Emission of Radiation- the crucial phenomena in the operation of lasers and masers. The emitted photon is in phase with the stimulating photon. > As these beasties come in a mounting that already > has facilities for screw fixing, perhaps there is > potential capability for optical communications? Been done. UK record, as of a couple of years back at least, was something like 75km. There is project in the latest RSGB handbook (if you are interesed I'll look up the page, I noticed the article but haven't read the detail). -- 73 Brian www.g8osn.org.uk Article: 96790 of rec.radio.amateur.homebrew From: Spike Subject: In the interests of historical accuracy: Case White Date: Sun, 12 Mar 2006 09:36:36 +0000 Message-ID: <4oq712df168pnt2pqt68ujg19hulruu7ts@4ax.com> Invasion of Poland (Fall Weiss) On August 31st, Hitler signed Directive No.1 for the Conduct of the War and the order went out at 4:00pm to invade Poland at 4:45am on September 1st of 1939. That night SS units staged incidents along the border including a phony Polish raid on a German radio station at Gleiwitz (Gliwice). Before sunrise the next morning, Friday, September 1st of 1939, World War Two began. Germany invaded Poland, the German attack beginning at 4:45am, when the Battleship (training ship) "Schleswig-Holstein" (on a so-called "goodwill visit") opened fire on a Polish naval depot and garrison at Westeplatte. An hour later, first German units crossed the border. On September 3rd, 1939, Great Britain and France declared war on Germany. The full article, which makes very interesting reading, is available at http://gi.grolier.com/wwii/wwii_3.html from Aero Spike Article: 96791 of rec.radio.amateur.homebrew From: "Gordon Hudson" References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> <1142146185.518102.243580@j52g2000cwj.googlegroups.com> Subject: Re: Optical Communications? RSCB Irrelevance? (Was : Re: The smallest Baird Televisor?) Date: Sun, 12 Mar 2006 09:41:34 -0000 Message-ID: <4413eccf$0$1171$5a6aecb4@news.aaisp.net.uk> "Brian Reay" wrote in message news:xLRQf.999$_W6.95@newsfe5-win.ntli.net... > > "Plod's Conscience" wrote in message > news:1142146185.518102.243580@j52g2000cwj.googlegroups.com... >> Played with it last night. >> >> Powered as it is by AAA cells, it seems to have >> a greater power, and a greater reserve of power, than >> those laserpointers powered by watch batteries. > > Given the relative size of AAA and "watch batteries", this is hardly > surprising. > >> Allowing for the lens that is used to produce the >> straight line beam, the spot from the end was >> easily picked out on a gravestone 1/4 mile away, >> thus suggesting that a tight beam is being produced. >> > > Laser's are coherent sources, the "ASER" stands for Amplification by > Stimulated Emission of Radiation- the crucial phenomena in the operation > of lasers and masers. The emitted photon is in phase with the stimulating > photon. > >> As these beasties come in a mounting that already >> has facilities for screw fixing, perhaps there is >> potential capability for optical communications? > > Been done. UK record, as of a couple of years back at least, was something > like 75km. There is project in the latest RSGB handbook (if you are > interesed I'll look up the page, I noticed the article but haven't read > the detail). Many years ago Practical Wireless had adesign for turning every ready torches (the ones with the big 9v batteries) into a transmitter and receiver by amplitude modulating the bulb. It actually worked (over about 20 feet). Article: 96792 of rec.radio.amateur.homebrew From: "Brian Reay" References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> <1142146185.518102.243580@j52g2000cwj.googlegroups.com> <4413eccf$0$1171$5a6aecb4@news.aaisp.net.uk> Subject: Re: Optical Communications? Message-ID: Date: Sun, 12 Mar 2006 09:51:14 GMT "Gordon Hudson" wrote in message news:4413eccf$0$1171$5a6aecb4@news.aaisp.net.uk... >> Been done. UK record, as of a couple of years back at least, was something >> like 75km. There is project in the latest RSGB handbook (if you are >> interesed I'll look up the page, I noticed the article but haven't read >> the detail). > > > Many years ago Practical Wireless had adesign for turning every ready > torches (the ones with the big 9v batteries) into a transmitter and > receiver by amplitude modulating the bulb. > It actually worked (over about 20 feet). Remember it (or one like it) well- it was one of the many projects I tried as a youngster. (Same sort of time I played with the Fuller Phone). With a laser pointer but I'm not sure how linear the transfer function is- ie is it linear enough to make AM viable. I've not looked into this but maybe someone will know. -- 73 Brian www.g8osn.org.uk Article: 96793 of rec.radio.amateur.homebrew From: Spike Subject: Re: Optical Communications? RSCB Irrelevance? (Was : Re: The smallest Baird Televisor?) Date: Sun, 12 Mar 2006 10:01:42 +0000 Message-ID: <6cr712du3m5q1vg49fhjfm0n21bst29sdk@4ax.com> References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> <1142146185.518102.243580@j52g2000cwj.googlegroups.com> Brian Reay wrote: > >"Plod's Conscience" wrote > >> Played with it last night. Perhaps he and Nedlar could get together; Nedlar didn't seem to have much to do last night either. >> Powered as it is by AAA cells, it seems to have >> a greater power, and a greater reserve of power, than >> those laserpointers powered by watch batteries. >Given the relative size of AAA and "watch batteries", this is hardly >surprising. Well, quite. The shortest Google search would have turned up the information needed to avoid him making such an obvious statement. A CR2032 battery has a capacity of 220 mAh at a current drain of 0.2 m/A.A modern AAA battery far exceeds that - I've left it as an exercise for the OP to search for that info.. >> Allowing for the lens that is used to produce the >> straight line beam, the spot from the end was >> easily picked out on a gravestone 1/4 mile away, >> thus suggesting that a tight beam is being produced. A 'tight beam' would indicate a spot not much larger than the laser source. Unfortunately, the lack of *any* objective statement in the above gives no indication that the beam was 'tight', merely that it reached it's target. >Laser's are coherent sources, the "ASER" stands for Amplification by >Stimulated Emission of Radiation- the crucial phenomena in the operation of >lasers and masers. The emitted photon is in phase with the stimulating >photon. > >> As these beasties come in a mounting that already >> has facilities for screw fixing, perhaps there is >> potential capability for optical communications? > >Been done. UK record, as of a couple of years back at least, was something >like 75km. There is project in the latest RSGB handbook (if you are >interesed I'll look up the page, I noticed the article but haven't read the >detail). Nothing new there with Gareth reinventing the wheel; it's very similar (perhaps part of the same syndrome?) to his continually re-writing history in his own vein. from Aero Spike Article: 96794 of rec.radio.amateur.homebrew From: "John A" Subject: Wainwright Mini-Mounts Date: Sun, 12 Mar 2006 10:04:11 -0000 Message-ID: Does anyone know of a UK source for "Wainwright Mini-mounts"? These are small PCBs made in Germany by WMM GmbH (no web-site or email!), laid out to take an IC, with tracks from each IC pad taken out to the edge of the PCB - very useful for prototyping with TSSOP devices it seems. If they sound interesting, see: http://www.rdi-wainwright.com/ which is the site of the US agent - $100 min order! John Article: 96795 of rec.radio.amateur.homebrew From: Frank Turner-Smith G3VKI Subject: Re: Optical Communications? RSCB Irrelevance? (Was : Re: The smallest References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> <1142146185.518102.243580@j52g2000cwj.googlegroups.com> Message-ID: Date: Sun, 12 Mar 2006 10:23:16 GMT on 12/03/2006 06:49 Beanie said the following: > Played with it last night. > Same as every other night. ...(_!_)... Article: 96796 of rec.radio.amateur.homebrew From: Nedlar Subject: Re: The smallest Baird Televisor? Date: Sun, 12 Mar 2006 10:24:53 +0000 Message-ID: References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> On Sun, 12 Mar 2006 06:41:38 GMT, "Old Nicks Deputy \(first class\)" wrote: > >"Nedlar" wrote in message >news:a6n612dfv9ofm8kavklad2u08on36bca3o@4ax.com... >> On Sat, 11 Mar 2006 15:58:41 -0600, Bob Bob wrote: >> > >> >> For info only... >> John Logie Baird demonstrated colour TV in 1928. > >Coincidently, the year of your fiftieth birthday, IIRC. > >tox > Oh boy, the bald one has attempted a funny response...and failed again. Article: 96797 of rec.radio.amateur.homebrew From: "Brian Reay" References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> <1142146185.518102.243580@j52g2000cwj.googlegroups.com> <1142157916.828014.60990@p10g2000cwp.googlegroups.com> Subject: Re: Optical Communications? RSCB Irrelevance? (Was : Re: The smallest Baird Televisor?) Message-ID: Date: Sun, 12 Mar 2006 10:29:46 GMT "Plod's Conscience" wrote in message news:1142157916.828014.60990@p10g2000cwp.googlegroups.com... > Your underlying motivatiopn to pooh-pooh makes you > seem like a fool. > Someone offers you genuine information, on topic to your post, and you see it as "pooh-pooh". I can see why you are a "slow learner", to use your own description of yourself. > It is the optical path that determines the divergence, or otherwise > of the beam, by dispersion, diffraction, refraction mechanisms, > and not the coherence of the radiation. > Eh, no. A laser will diverge in the absence of a medium. Degree of collimation and coherence both are factors in divergence and you are jumbling together a raft of factors that I supect you don't understand and I know you don't want to learn about. -- 73 Brian www.g8osn.org.uk Article: 96798 of rec.radio.amateur.homebrew From: "Brian Reay" References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> <1142146185.518102.243580@j52g2000cwj.googlegroups.com> <6cr712du3m5q1vg49fhjfm0n21bst29sdk@4ax.com> Subject: Re: Optical Communications? Message-ID: Date: Sun, 12 Mar 2006 10:34:28 GMT "Spike" wrote in message news:6cr712du3m5q1vg49fhjfm0n21bst29sdk@4ax.com... > > A 'tight beam' would indicate a spot not much larger than the laser > source. Unfortunately, the lack of *any* objective statement in the > above gives no indication that the beam was 'tight', merely that it > reached it's target. > I half suspect the lens is present to spread the beam- to make it large enough to see a worthwhile "spot. -- 73 Brian www.g8osn.org.uk Article: 96799 of rec.radio.amateur.homebrew From: Nedlar Subject: Re: Optical Communications? RSCB Irrelevance? (Was : Re: The smallest Baird Televisor?) Date: Sun, 12 Mar 2006 10:43:40 +0000 Message-ID: References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> <1142146185.518102.243580@j52g2000cwj.googlegroups.com> <6cr712du3m5q1vg49fhjfm0n21bst29sdk@4ax.com> On Sun, 12 Mar 2006 10:01:42 +0000, Spike wrote: > >Perhaps he and Nedlar could get together; Nedlar didn't seem to have >much to do last night either. Well I certainly didn't waste it doing Google searches, like you do. Has your copy of the crap film ' Bridges at Toko Ri' bit the dust? > >The shortest Google search would have turned up the information needed >to avoid him making such an obvious statement. A CR2032 battery has a >capacity of 220 mAh at a current drain of 0.2 m/A.A modern AAA battery >far exceeds that - I've left it as an exercise for the OP to search >for that info.. Well we seem to be making progress. You are now acknowledging that you use Google to gather information and are not trying to pass it off as your own work. Well done, keep it up! If we could now get you to understand what ' I can't think of anything else' means, then that would be real progress. HTH -- S.N.M Article: 96800 of rec.radio.amateur.homebrew From: "Samuel Hunt" Subject: 4CX250B 2m linear circuit? (Class C ideally!) Date: Sun, 12 Mar 2006 11:30:43 +0000 (UTC) Message-ID: Hi all. I'm trying to find a good circuit for a Class C 4CX250B linear. I've found a few for multiple valves in Class A, but I'm after just a simple circuit that shows a 4CX250B linear for 2m with Class C biasing. Idea is to use it for a little project where I want to run about 100W, but run it cleanly without all the RF hash that transistor amps give. Can anyone point me in the right direction? Also, how would you go about varying the RF power output on a 4CX250B linear in class C? Is it by varying the 1.2kV supply voltage, which would make sense, or is there some other recommended way? Sam Article: 96801 of rec.radio.amateur.homebrew From: "Samuel Hunt" Subject: Re: 7/8 wave antennas? Date: Sun, 12 Mar 2006 11:32:38 +0000 (UTC) Message-ID: References: <1212mc1l4k6eeb4@corp.supernews.com> Thanks all It seems like it's false advertising claims when you see them with 6dB then, so I'll save my money and stick with my 5/8 wave. It's nice to run things like this past people before I get conned myself! Sam Article: 96802 of rec.radio.amateur.homebrew From: "Ralph Mowery" References: Subject: Re: 4CX250B 2m linear circuit? (Class C ideally!) Message-ID: Date: Sun, 12 Mar 2006 12:53:08 GMT "Samuel Hunt" wrote in message news:dv10p2$1fh$1@nwrdmz03.dmz.ncs.ea.ibs-infra.bt.com... > Hi all. > > I'm trying to find a good circuit for a Class C 4CX250B linear. > > I've found a few for multiple valves in Class A, but I'm after just a simple > circuit that shows a 4CX250B linear for 2m with Class C biasing. > > Idea is to use it for a little project where I want to run about 100W, but > run it cleanly without all the RF hash that transistor amps give. > > > Can anyone point me in the right direction? > > Also, how would you go about varying the RF power output on a 4CX250B linear > in class C? Is it by varying the 1.2kV supply voltage, which would make > sense, or is there some other recommended way? > > There is not really any difference in a class A and Class C circuit. Just adjust the screen and control grid voltage to the class of operation you want. Should be in any of the tube manuals. Article: 96803 of rec.radio.amateur.homebrew From: "The Magnum" Subject: Re: The smallest Baird Televisor? Date: Sun, 12 Mar 2006 13:22:38 -0000 Message-ID: References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> <1216ttactegtd01@corp.supernews.com> "Butch Magee" wrote in message news:1216ttactegtd01@corp.supernews.com... > Plod's Conscience wrote: > > My local garage is selling laser devices that project > > a straight line for just under a fiver. I wonder if these > > devices (with the lens removed so that they just > > produce a single spot) could be modulated to be > > the light source in a Baird Televisor? > > > > Also, I wonder what is the smallest such Televisor > > that has been produced? > > > What a Televisor? > KF5DE A television transmitter. A broadcaster of television programs; a telecaster. Regards, Graham -- -.-. -... / .-. .- -.. .. --- Radio is only a Hobby. Don't let it rule your life... 73/51 - Graham, 26-Golf Charlie-19 Article: 96804 of rec.radio.amateur.homebrew From: "Chris Fox NI4L" Subject: need bandswitch Message-ID: Date: Sun, 12 Mar 2006 08:29:42 -0500 Hi everyone, I am in need of a complete multi wafer bandswitch 5/6 lugs for a set of 3-500Z. Currently, the one installed is a single wafer, trying to hookup a tuned input board. The amp i am working on is Hunter Bandit 2000C which is 10-80 meters. Any suggestions, or have one laying around in your parts bin you can let go? Thanks for looking. 73 Chris NI4L Article: 96805 of rec.radio.amateur.homebrew From: "Samuel Hunt" Subject: Re: 4CX250B 2m linear circuit? (Class C ideally!) Date: Sun, 12 Mar 2006 13:32:48 +0000 (UTC) Message-ID: References: So basically take off the bias? I assume then that I can just use the tank circuit to tune it nicely? And I might have to increase the drive by 4 times in order to get the potential 4 times increase in output? Sounds simple enough to me! Sam "Ralph Mowery" wrote in message news:UQUQf.10389$S25.8418@newsread1.news.atl.earthlink.net... > > "Samuel Hunt" wrote in message > news:dv10p2$1fh$1@nwrdmz03.dmz.ncs.ea.ibs-infra.bt.com... >> Hi all. >> >> I'm trying to find a good circuit for a Class C 4CX250B linear. >> >> I've found a few for multiple valves in Class A, but I'm after just a > simple >> circuit that shows a 4CX250B linear for 2m with Class C biasing. >> >> Idea is to use it for a little project where I want to run about 100W, >> but >> run it cleanly without all the RF hash that transistor amps give. >> >> >> Can anyone point me in the right direction? >> >> Also, how would you go about varying the RF power output on a 4CX250B > linear >> in class C? Is it by varying the 1.2kV supply voltage, which would make >> sense, or is there some other recommended way? >> >> > There is not really any difference in a class A and Class C circuit. Just > adjust the screen and control grid voltage to the class of operation you > want. Should be in any of the tube manuals. > > Article: 96806 of rec.radio.amateur.homebrew From: "The Magnum" Subject: Re: What does it mean to be a _REAL_ Radio Ham? The FAQ is here! Date: Sun, 12 Mar 2006 13:48:44 -0000 Message-ID: References: <1142003010.363667.13530@j52g2000cwj.googlegroups.com> <1142011075.318858.200330@i40g2000cwc.googlegroups.com> <7h4be3-3pe.ln1@p400bob.personal.cox.net> <1142092464.204794.167230@e56g2000cwe.googlegroups.com> <1142144636.034290.324790@i39g2000cwa.googlegroups.com> "Plod's Conscience" wrote in message news:1142144636.034290.324790@i39g2000cwa.googlegroups.com... > Do you really think that after your personal outbursts > directed at me, including your opening paragraph below, that > I regard you as a serious debater? Whereas most people in this newsgroup recognise Mr Evans as a 'Mass Debater' Graham -- -.-. -... / .-. .- -.. .. --- Radio is only a Hobby. Don't let it rule your life... 73/51 - Graham, 26-Golf Charlie-19 Article: 96807 of rec.radio.amateur.homebrew From: Eamon Skelton Subject: Re: 4CX250B 2m linear circuit? (Class C ideally!) Message-ID: References: Date: Sun, 12 Mar 2006 14:10:14 +0000 On Sun, 12 Mar 2006 11:30:43 +0000, Samuel Hunt wrote: > Hi all. > > I'm trying to find a good circuit for a Class C 4CX250B linear. There are a few designs in the old RSGB VHF/UHF Manual. If you are searching the web for info, leave out the word 'linear'. A class C amp is usually not linear. I use a single 4CX250B on 2M. The G1 bias control is on the front panel so that I can adjust it to class AB for SSB and class B or C for CW,JT65 or FM. http://www.qsl.net/la0by/2m-hpa.htm http://www.nitehawk.com/sm5bsz/power.htm 73, Ed. EI9GQ. -- Linux 2.6.15 Remove 'X' to reply by e-mail. Yes, my username really is: nospam Article: 96808 of rec.radio.amateur.homebrew From: Bob Bob Subject: Re: Optical Communications? RSCB Irrelevance? (Was : Re: The smallest References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> <1142146185.518102.243580@j52g2000cwj.googlegroups.com> <6cr712du3m5q1vg49fhjfm0n21bst29sdk@4ax.com> Message-ID: <1fode3-1jv.ln1@p400bob.personal.cox.net> Date: Sun, 12 Mar 2006 08:40:00 -0600 What is the efficiency of a laser device like nowadays? I went to a 3D TV IEEE demo back in the 1970's where the device looked like a TV but had "depth". Kind of like those kids puppet theatres! The big thing I remember at the time was the huge power consumption (1000-2000W?) needed to produce even a moderately lit picture. It was said at the time that the appliance would probably never be marketed as a 3DTV in every house would flatten the electricity supply system every time a football/crickrt match was on! I cant quite remember the physics or name behind the 3D technique. Some kind of inteference pattern generation maybe. The name escapes me... Cheers Bob VK2YQA Spike wrote: > >>>Powered as it is by AAA cells, it seems to have >>>a greater power, and a greater reserve of power, than >>>those laserpointers powered by watch batteries. > The shortest Google search would have turned up the information needed > to avoid him making such an obvious statement. A CR2032 battery has a > capacity of 220 mAh at a current drain of 0.2 m/A.A modern AAA battery > far exceeds that - I've left it as an exercise for the OP to search > for that info.. Article: 96809 of rec.radio.amateur.homebrew From: microwaves@blueyonder.co.uk (Peter) Subject: Re: Optical Communications? RSCB Irrelevance? (Was : Re: The smallest Baird Televisor?) Message-ID: <44143a01.671848046@news.blueyonder.co.uk> References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> <1142146185.518102.243580@j52g2000cwj.googlegroups.com> Date: Sun, 12 Mar 2006 15:14:17 GMT On Sun, 12 Mar 2006 09:22:37 GMT, "Brian Reay" wrote: >> As these beasties come in a mounting that already >> has facilities for screw fixing, perhaps there is >> potential capability for optical communications? > >Been done. UK record, as of a couple of years back at least, was something >like 75km. There is project in the latest RSGB handbook (if you are >interesed I'll look up the page, I noticed the article but haven't read the >detail). The current UK laser record is around 73km I believe... held by G0MFR and G8LSD. They used standard low power red laser diodes of the kind found in the pointers. Barry,G8AGN, Gordon G0EWN and myself (all in Sheffield) are also experimenting on these lines have done a 45km path so far... using cw. We have some LOS paths up here in the North up to 136km so we're hoping to better the record one day soon :-) Peter, G3PHO Article: 96810 of rec.radio.amateur.homebrew From: "Ralph Mowery" References: Subject: Re: 4CX250B 2m linear circuit? (Class C ideally!) Message-ID: <4bXQf.10426$S25.6037@newsread1.news.atl.earthlink.net> Date: Sun, 12 Mar 2006 15:33:20 GMT "Samuel Hunt" wrote in message news:dv17tv$5l5$1@nwrdmz02.dmz.ncs.ea.ibs-infra.bt.com... > So basically take off the bias? > > You don't take it off like you would a transistor. Tubes work sort of backwards from transistors. YOu increase the voltage to the recommended value of plate current. Somewhere around -50 volts for AB and -100 volts for C. That would give around 60 ma of plate current for AB and very low current for C with no input signal. You will need the tube spec sheet for closer values. Also the screen voltage should be changed for the mode if operation is for CW only. Think it is about 250 Volts for CW and 350 for AB but may have it backwards. Article: 96811 of rec.radio.amateur.homebrew From: Ken Scharf Subject: Re: 4CX250B 2m linear circuit? (Class C ideally!) References: Message-ID: Date: Sun, 12 Mar 2006 10:48:39 -0500 Samuel Hunt wrote: > Hi all. > > I'm trying to find a good circuit for a Class C 4CX250B linear. > > I've found a few for multiple valves in Class A, but I'm after just a simple > circuit that shows a 4CX250B linear for 2m with Class C biasing. > > Idea is to use it for a little project where I want to run about 100W, but > run it cleanly without all the RF hash that transistor amps give. > > > Can anyone point me in the right direction? > > Also, how would you go about varying the RF power output on a 4CX250B linear > in class C? Is it by varying the 1.2kV supply voltage, which would make > sense, or is there some other recommended way? > > > Sam > > Oxymoron. Class C is NOT linear! Now if you want to amplify CW or FM signals, class C is fine. For AM or SSB signals you want class A, AB or B. For this tube the grid #1 bias, grid #2 voltage and grid #1 drive (signal input) are different as you change class of operation. (Mostly the screen and plate voltages can remain the same and just change the resting plate current with the bias and don't apply more than a specific signal level so your max plate current isn't exceeded.) Article: 96812 of rec.radio.amateur.homebrew From: Ken Scharf Subject: Re: Question about 4-400 tube socket/mounting References: <1141646465.739304.322020@e56g2000cwe.googlegroups.com> <1141899218.563731.304420@i40g2000cwc.googlegroups.com> <1142127197.420037.283170@u72g2000cwu.googlegroups.com> Message-ID: Date: Sun, 12 Mar 2006 10:54:03 -0500 w8ji@akorn.net wrote: > terry@terryking.us wrote: > >>Doug, a suggestion about "Longevity" for 4-400's (Actually, any >>thoriated-tungsten filament power tubes): >> >>These tubes are very sensitive to filament voltage. Make sure the tube >>pins and socket are nice and clean and shiny (don't use any >>abrasives!).. Measure filament voltage at the socket. This is all to >>make sure the tubes REALLY get the correct filament voltage to the >>filament... It's 28 Amps for two tubes! > > > Actually in amateur service filament voltage is not that big a worry. I > think the excessive worry comes as a carryover from BC service where > tubes are operated far below ratings and can be operated for almost > 9000 hours per year. > > In BC service, excessive voltage shows up in a noticable period of time > since the tubes are operated 24/7. The voltages and currents of other > elements are a much lower percentage of maximum compared to amateur > service, and filaments are not cycled. As such, emission failures are a > common failure mechanism. > > In amateur service, it takes many years and thousands of fialment > cycles to accumalate the hours a BC tube sees in one year. Tubes in > amateur service much more often fail from seal leakage, element > structure defects, and occasional abuse. > > Out of hundreds of tubes I've seen fail in amateur service over the > past 30 years, I can count the number of emission failures on my two > hands. > > I'm not saying filaments should be run extra hot, but I am trying to > point out what worries BC stations is often not a concern in amateur > use. > > By the way, two of the emission failures I saw were in 8877 tubes that > were operated too cold. The owners had reduced filament voltage below > 4.75 volts. NEVER run a MOX cathode tube at reduced voltage unless you > also plan to limit peak emission current. > > My advice is to run all tubes in amateur service at RATED filament > voltage or in the allowable tolerance range for voltage. > > As for cooling, seal cooling is critical in glass tubes. So is periodic > operation to keep the tubes gettered. > > http://www.w8ji.com/vacuum_tubes_and_vaccum_tube_failures.htm > > 73 Tom > If oversize filament transformers are used (never know what kind of surplus junk hams use!) there is a danger of filament failure due to starting in-rush current. My home brew linear started these tubes up with a power resistor in series with the primary of the filament transformer for a few seconds, which was then shorted out by a relay. A transistor r/c delay circuit did the dirty work. This lets the tube filaments preheat a bit before applying full voltage. Article: 96813 of rec.radio.amateur.homebrew From: Ken Scharf Subject: Re: need bandswitch References: Message-ID: Date: Sun, 12 Mar 2006 10:57:03 -0500 Chris Fox NI4L wrote: > Hi everyone, > > I am in need of a complete multi wafer bandswitch 5/6 lugs for a set of > 3-500Z. > > Currently, the one installed is a single wafer, trying to hookup > > a tuned input board. The amp i am working on is Hunter Bandit 2000C > > which is 10-80 meters. Any suggestions, or have one laying around in your > parts bin you can let go? > > Thanks for looking. > > 73 > > Chris NI4L > > You can try to home brew your own by attaching a shaft to the back of the main band switch to gang to a second one. If in your case, you want to add a tuned input switch this is the best bet as the two switches should be of different sizes (one high power one low). You might need to use flexible shafting for the coupling, and gearing if the two switches have different switching angles. From "know code" Sun Mar 12 13:07:27 EST 2006 Article: 96814 of rec.radio.amateur.homebrew Date: Sun, 12 Mar 2006 17:51:53 +0100 From: know code Reply-To: "know code" User-Agent: Thunderbird 1.5 (Windows/20051201) MIME-Version: 1.0 Newsgroups: uk.radio.amateur,rec.radio.amateur.homebrew Subject: Re: Optical Communications? RSCB Irrelevance? (Was : Re: The smallest Baird Televisor?) References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> <1142146185.518102.243580@j52g2000cwj.googlegroups.com> In-Reply-To: <1142146185.518102.243580@j52g2000cwj.googlegroups.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Lines: 10 Message-ID: <441451a6$0$42166$dbd49001@news.wanadoo.nl> Organization: Wanadoo NNTP-Posting-Date: 12 Mar 2006 16:51:50 GMT NNTP-Posting-Host: s5591cd23.adsl.wanadoo.nl X-Trace: 1142182310 dr7.euro.net 42166 85.145.205.35:2581 X-Complaints-To: abuse@wanadoo.nl Path: news0.isis.unc.edu!elk.ncren.net!logbridge.uoregon.edu!news.tele.dk!news.tele.dk!small.news.tele.dk!multikabel.net!feed20.multikabel.net!news2.euro.net!postnews2.euro.net!news.wanadoo.nl!not-for-mail Xref: news0.isis.unc.edu uk.radio.amateur:267585 rec.radio.amateur.homebrew:96814 Plod's Conscience wrote: > Played with it last night. What you do in the privacy of your own home is up to you! > Powered as it is by AAA cells, it seems to have > a greater power, and a greater reserve of power Again, what you do in the privacy of your own home..... Article: 96815 of rec.radio.amateur.homebrew From: Hils Subject: Re: In the interests of historical accuracy: Case White Date: Sun, 12 Mar 2006 17:20:44 +0000 Message-ID: References: <4oq712df168pnt2pqt68ujg19hulruu7ts@4ax.com> Spike wrote >The full article, which makes very interesting reading, is available >at http://gi.grolier.com/wwii/wwii_3.html More information in David Irving's "Hitler's War", free download from http://www.fpp.co.uk/ -- Hil Article: 96816 of rec.radio.amateur.homebrew From: Spike Subject: Re: Optical Communications? RSCB Irrelevance? (Was : Re: The smallest Baird Televisor?) Date: Sun, 12 Mar 2006 18:19:33 +0000 Message-ID: References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> <1142146185.518102.243580@j52g2000cwj.googlegroups.com> <6cr712du3m5q1vg49fhjfm0n21bst29sdk@4ax.com> Nedlar, hoping that Sunday evening wouldn't turn out like Saturday evening did, wrote: >Spike wrote: > >>Perhaps he and Nedlar could get together; Nedlar didn't seem to have >>much to do last night either. > >Well I certainly didn't waste it doing Google searches, like you do. >Has your copy of the crap film ' Bridges at Toko Ri' bit the dust? You are quite free to waste your time in any way that you wish; even on the Internet if you feel so inclined. After all, you say you like things kept simple. There's no need to feel apologetic. >>The shortest Google search would have turned up the information needed >>to avoid him making such an obvious statement. A CR2032 battery has a >>capacity of 220 mAh at a current drain of 0.2 m/A.A modern AAA battery >>far exceeds that - I've left it as an exercise for the OP to search >>for that info.. > >Well we seem to be making progress. You are now acknowledging that you >use Google to gather information and are not trying to pass it off as >your own work. Well done, keep it up! Unfortunately, you are making no progress whatsoever. I merely mentioned some characteristics of a typical watch cell, suggesting that if the OP looked on Google he could have found it out for himself, thus avoiding posting what he did and looking like a fool. Is that simple enough for you? >If we could now get you to understand what ' I can't think of anything >else' means, then that would be real progress. I know you like things kept simple, so I strongly suggest you never attempt to repair anything at all - you just don't have the brains for it. No throwing away of a fine receiver here due to 'nerves', fettling, or missing pages from the manual. ROFLMAO. In fact, it directly follows the Gospel According to Gareth, in his (still unqualified and therefore dangerous) 'repair with gusto' creed; something he has admitted failing in the past. ROFLMAO. Is that simple enough for you? from Aero Spike Article: 96817 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: 7/8 wave antennas? Date: Sun, 12 Mar 2006 11:48:37 -0800 Message-ID: <1218uop8o40971f@corp.supernews.com> References: <1212mc1l4k6eeb4@corp.supernews.com> If you're talking about the gain and power handling claims for CB antennas, they're pure fabrications. Roy Lewallen, W7EL Samuel Hunt wrote: > Thanks all > > It seems like it's false advertising claims when you see them with 6dB then, > so I'll save my money and stick with my 5/8 wave. > > It's nice to run things like this past people before I get conned myself! > > Sam > > Article: 96818 of rec.radio.amateur.homebrew From: Custos Custodum Subject: Re: Optical Communications? RSCB Irrelevance? (Was : Re: The smallest Baird Televisor?) Date: Sun, 12 Mar 2006 20:30:25 +0000 Message-ID: References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> <1142146185.518102.243580@j52g2000cwj.googlegroups.com> <6cr712du3m5q1vg49fhjfm0n21bst29sdk@4ax.com> <1fode3-1jv.ln1@p400bob.personal.cox.net> On Sun, 12 Mar 2006 08:40:00 -0600, Bob Bob wrote: >What is the efficiency of a laser device like nowadays? > >I went to a 3D TV IEEE demo back in the 1970's where the device looked >like a TV but had "depth". Kind of like those kids puppet theatres! The >big thing I remember at the time was the huge power consumption >(1000-2000W?) needed to produce even a moderately lit picture. It was >said at the time that the appliance would probably never be marketed as >a 3DTV in every house would flatten the electricity supply system every >time a football/crickrt match was on! > >I cant quite remember the physics or name behind the 3D technique. Some >kind of inteference pattern generation maybe. The name escapes me... > Holography? Article: 96819 of rec.radio.amateur.homebrew From: Nedlar Subject: Re: Optical Communications? RSCB Irrelevance? (Was : Re: The smallest Baird Televisor?) Date: Sun, 12 Mar 2006 20:47:05 +0000 Message-ID: References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> <1142146185.518102.243580@j52g2000cwj.googlegroups.com> <6cr712du3m5q1vg49fhjfm0n21bst29sdk@4ax.com> On Sun, 12 Mar 2006 18:19:33 +0000, Spike wrote: >You are quite free to waste your time in any way that you wish; even >on the Internet if you feel so inclined. After all, you say you like >things kept simple. There's no need to feel apologetic. Fortunately I am not confined to my house through fear and cowardice when the children are not at school, unlike yourself, so I have little time to waste on anything. Unnecessary embellishment of anything is a complete waste of time and effort. It's a pity you are too stupid to know this. If we could now get you to understand what ' I can't think of anything else' means, then that would be real progress. What is it about the above sentence that confuses you? Article: 96820 of rec.radio.amateur.homebrew From: Bob Bob Subject: Re: Optical Communications? RSCB Irrelevance? (Was : Re: The smallest References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> <1142146185.518102.243580@j52g2000cwj.googlegroups.com> <6cr712du3m5q1vg49fhjfm0n21bst29sdk@4ax.com> <1fode3-1jv.ln1@p400bob.personal.cox.net> Message-ID: Date: Sun, 12 Mar 2006 15:40:29 -0600 Yep thats the word.. Thanks! Custos Custodum wrote: > Holography? > Article: 96821 of rec.radio.amateur.homebrew From: Spike Subject: Re: Optical Communications? RSCB Irrelevance? (Was : Re: The smallest Baird Televisor?) Date: Sun, 12 Mar 2006 23:15:50 +0000 Message-ID: References: <1142099027.152408.11300@i39g2000cwa.googlegroups.com> <1142146185.518102.243580@j52g2000cwj.googlegroups.com> <6cr712du3m5q1vg49fhjfm0n21bst29sdk@4ax.com> Nedlar wrote: >On Sun, 12 Mar 2006 18:19:33 +0000, Spike >wrote: > > >>You are quite free to waste your time in any way that you wish; even >>on the Internet if you feel so inclined. After all, you say you like >>things kept simple. There's no need to feel apologetic. > >Fortunately I am not confined to my house through fear and cowardice >when the children are not at school, unlike yourself, so I have little >time to waste on anything. Unnecessary embellishment of anything is a >complete waste of time and effort. It's a pity you are too stupid to >know this. Do your neighbours know you have an excessive interest in the school holidays? >If we could now get you to understand what ' I can't think of anything >else' means, then that would be real progress. >What is it about the above sentence that confuses you? What is it about "No throwing away of a fine receiver here due to 'nerves', fettling, or missing pages from the manual. ROFLMAO. In fact, it directly follows the Gospel According to Gareth, in his (still unqualified and therefore dangerous) 'repair with gusto' creed; something he has admitted failing in the past. ROFLMAO." that you have difficulty with? Isn't the statement simple enough for you? from Aero Spike