Article: 101628 of rec.radio.amateur.boatanchors From: " Uncle Peter" References: <20812-43E0A7EB-453@storefull-3332.bay.webtv.net> Subject: Re: Double Super Hetrodyne what does this do in a CB Radio ? Message-ID: Date: Wed, 1 Feb 2006 16:15:56 -0500 "Captain Crane" wrote in message news:20812-43E0A7EB-453@storefull-3332.bay.webtv.net... > Hi, Does anyone know What Double Super Hetrodyne does in a CB radio. > I have a GE 40 channel cb and it has Double Super Hetrodyne. > Brian - Las Vegas > The straight answer? Double conversion is used to reduce images. It does nothing for sensitivity or selectivity in itself; and it probably decreases dynamic range and makes the receiver more prone to spurious responses. Pete Article: 101629 of rec.radio.amateur.boatanchors From: " Uncle Peter" References: <1138669094.511626.286550@g49g2000cwa.googlegroups.com> Subject: Re: How old are you? Message-ID: Date: Wed, 1 Feb 2006 18:24:41 -0500 57. I can't imagine how I got here this fast. Been a ham since 1961 or '62... First Radiotelephone since high school. I'm finally able to afford the rigs that I could only dream of owning when I was a kid. As a novice I started with a DX-60 and a Lafayette KT-200! When the solid state rigs came out I sold all my tube stuff. Now I'm trying to get them back! Pete K1ZJH Article: 101630 of rec.radio.amateur.boatanchors From: " Ron in Radio Heaven" References: <20812-43E0A7EB-453@storefull-3332.bay.webtv.net> Subject: Re: Double Super Hetrodyne what does this do in a CB Radio ? Message-ID: Date: Wed, 01 Feb 2006 23:37:19 GMT Captain Crane wrote in message news:20812-43E0A7EB-453@storefull-3332.bay.webtv.net... > Hi, Does anyone know What Double Super Hetrodyne does in a CB radio. > I have a GE 40 channel cb and it has Double Super Hetrodyne. > Brian - Las Vegas > My question is what the heck does this have to do with AMATEUR BOATANCHORS? There are dozens of CB newsgroups out there, maybe hundreds, of course no one there could have answered this question... But still. I know, now someone is going to say I'm being rude to new comers... Ron Article: 101631 of rec.radio.amateur.boatanchors From: " Uncle Peter" References: <501Ef.21444$Jd.16783@newssvr25.news.prodigy.net> Subject: Re: Looking for a Hallicrafters SX-38/In florida Message-ID: Date: Wed, 1 Feb 2006 18:39:11 -0500 "Carter, K8VT" wrote in message news:501Ef.21444$Jd.16783@newssvr25.news.prodigy.net... > COLIN LAMB wrote: > > > > They are a classic radio, so enjoy it. > > It's also an AC-DC radio with one side of the line grounded to the > chassis and it has a metal cabinet--a killer. > > So enjoy it CAREFULLY! The chassis should have intergral electrical insulators that isolate it from the cabinet. Personally, I'd use a polarized grounded plug to insure the case was at ground potential (while maintaining the insulators to keep the neutral side isolated). The original S-38 had six tubes (dedicated BFO instead of a regenerative IF), so it might be the more desirable from a boatanchor tube count aspect.. Pete Article: 101632 of rec.radio.amateur.boatanchors From: "Carter, K8VT" Subject: Re: Looking for a Hallicrafters SX-38/In florida References: <501Ef.21444$Jd.16783@newssvr25.news.prodigy.net> Message-ID: Date: Thu, 02 Feb 2006 00:09:19 GMT >> COLIN LAMB wrote: >>> They are a classic radio, so enjoy it. Carter, K8VT wrote: >> It's also an AC-DC radio with one side of the line grounded to the >> chassis and it has a metal cabinet--a killer. >> >> So enjoy it CAREFULLY! Uncle Peter wrote: > The chassis should have intergral electrical insulators that > isolate it from the cabinet. Uncle Peter, you're right! The operative words are "should have". But, as Dirty Harry once famously asked, "How lucky do you feel?" As long as the original poster realizes that all that is between him and an eyeball rattling shock is 4 crumbling, rotted 50 year old rubber washers that may or may not even be there, then he'll be OK... Article: 101633 of rec.radio.amateur.boatanchors From: Phil Witt Subject: Re: How old are you? Message-ID: References: <1138669094.511626.286550@g49g2000cwa.googlegroups.com> <1138765947.895777.126970@g49g2000cwa.googlegroups.com> <%_WDf.52927$Kp.38997@southeast.rr.com> Date: Wed, 01 Feb 2006 19:35:06 -0600 On Wed, 01 Feb 2006 04:42:35 GMT, " Ron in Radio Heaven" wrote: >Harold, you're repeating yourself.... > >Ron > Shhhh. It goes with the age. Article: 101634 of rec.radio.amateur.boatanchors From: - exray - Subject: Re: How old are you? Date: Wed, 01 Feb 2006 21:58:53 -0400 Message-ID: <11u2pqscpdtemb8@corp.supernews.com> References: <1138669094.511626.286550@g49g2000cwa.googlegroups.com> <1138765947.895777.126970@g49g2000cwa.googlegroups.com> <%_WDf.52927$Kp.38997@southeast.rr.com> Phil Witt wrote: > On Wed, 01 Feb 2006 04:42:35 GMT, " Ron in Radio Heaven" > wrote: > > >>Harold, you're repeating yourself.... >> >>Ron >> > > > Shhhh. It goes with the age. Could you repeat that? I can't remember if I didn't hear it or forgot it. -Bill Article: 101635 of rec.radio.amateur.boatanchors From: Bob Miller Subject: Re: How old are you? Message-ID: References: <1138669094.511626.286550@g49g2000cwa.googlegroups.com> Date: Thu, 02 Feb 2006 02:13:52 GMT On 30 Jan 2006 16:58:14 -0800, nc183d@aol.com wrote: >Just a question that has been rattling around in the gourd. What age >group are B/A enthusiast-type folks here on the Net? I know we have the >folks from when they (the B/A's) were the most active (and I'm talking >SX11 here), but I wonder if there's a large following of Boomers that >picked up on it too. I only say this because I don't see as many >30's-40's-50's people at the Hamfests and other gatherings as I see my >elders (Gentlemen, all). So the question bubbles up outta the tar? How >old are the folks on rec.radio.amateur.boatanchor? >rgds, Mark S. First licensed as a Novice around '57 or '58 as KN5QWG, and then got my General. Nowadays, at age 62, still hanging around all the slow senders on the old 80 meter Novice band, 3700-3750. I was using Teflon-coated wire before they thought to use the stuff for skillets. bob k5qwg Article: 101636 of rec.radio.amateur.boatanchors From: " Uncle Peter" References: Subject: Re: Central Electronics 20 A Phase shift question Message-ID: Date: Wed, 1 Feb 2006 21:18:20 -0500 I'm glad to see there's a pool of Central Electronic phasing SSB equipment on tap here. I have a Sideband Slicer that will be mated to an SX-28-- when I get around to restoring the pair. I'm sure some alignment questions will arise. Pete Article: 101637 of rec.radio.amateur.boatanchors From: "Reg Edwards" Subject: New program - antenna counterpoise Date: Thu, 2 Feb 2006 02:23:21 +0000 (UTC) Message-ID: A coil-loaded counterpoise at a low height above ground is used to provide an artificial ground for an antenna when, for some reason, a true ground connection is not possible or there is not enough space to erect a full 1/4-wavelength horizontal wire. The principal effects of low height are a loss resistance induced in the wire from the ground, and a reduction in propagation velocity along the wire. A counterpoise can be considered to be an artificial ground. Its input resistance at resonance is equivalent to the input resistance of a true ground connection but its resistance will never be as low as a good ground. To provide a lower input resistance three or four counterpoises can be used in parallel. Or they can be resonant on different bands. New program C_POISE estimates the performance of a single coil-loaded counterpoise. The number of turns on a coil of given length and diameter needed to resonate a low wire to 1/4-wave resonance is calculated. The input resistance at resonance is also estimated.. All program output data is approximate due to the very low height of the wire above ground and uncertainty in the characteristics of the soil or whatever other materials may be under the wire. The wire may be allowed to rest on the ground surface but uncertainty will be at a maximum. It will nearly always be needed to prune the wire length for resonance. Or when the wire length is fixed the coil turns may need adjustment. When wire height exceeds wire length accuracy is much improved. Input resistance at resonance will be fairly small. Working Q will be high and the counterpoise will behave as a short antenna. For precise resonance the wire will still need pruning. Download program C_POISE in a few seconds from website below and run immediately. ---- ........................................................... Regards from Reg, G4FGQ For Free Radio Design Software go to http://www.btinternet.com/~g4fgq.regp ........................................................... Article: 101638 of rec.radio.amateur.boatanchors From: "Fred W4JLE" Subject: Good Guy Date: Wed, 1 Feb 2006 22:11:30 -0500 Message-ID: <33530$43e17863$97d56b99$7447@ALLTEL.NET> We hear a lot about all the problems with sales etc. I just completeted a great transaction with Al, W8UT and he was just great! Fred W4JLE Article: 101639 of rec.radio.amateur.boatanchors Subject: Re: More on PEP, AM, average power, etc. From: "Clif Holland" Date: Thu, 26 Jan 2006 04:47:46 GMT Message-ID: References: Are you as dumb as you seem?? -- Clif "Straydog" wrote in message news:Pine.NEB.4.63.0601252142230.9221@panix3.panix.com... > > Since my earlier post (dealing with the question of what is peak evelope > power output in an AM transmitter), I've been doing more scrutinizing of > tube Ip/Vp characteristic curves. They are much more non-linear than the > impression you get from just looking at the curves. Also, it is rare or > almost non-existant to find Ip vs screen voltage! > > Lets look at the venerable 833 (from my RCA TT-3 transmitting tube > manual). This is a KW input class C triode. > > From the curve: > at zero grid volts, 1 kV on the plate gives 175 ma plate current > 2 kV 500 ma > That's more than a doubling of Ip for a doubling of Vp > > at minus 50 grid volts, 2 kV on the plate gives 50 ma plate current > 4 kV 750 ma > > looking in my RCA receiving tube manual (RC-20) I found for a 6FG6 > a sharp cutoff tetrode that only at zero grid volts was there a near > linear relationship between plate current and plate voltage (meaning zero > current at zero voltage, and a straight line [which actually deviated > slightly from a straight line] with some slope. But at 100 v on plate, > current was 14 milliamps, at 200 v on the plate, plate current was 34 > miliamps. Definitely NOT a linear relationship. For the 6EM7 a triode, and > at any of a wide range of grid voltages, plate current could be > doubled with only a 15-20% increase in plate voltage. > > My thinking on all of this leads me to claim that anyone who can start > with a 100 watt carrier from an AM transmitter and make a few assumptions > about 100% modulation and come up with a _calculation_ of something like > 400 watts of peak power and represent that as having something to do with > reality is pure conjecture. > > If anyone wants to put an appropriate oscilloscope on the transmitter > output > and measure the RF voltage of unmodulated carrier into an appropriate load > and then measure the peak RF voltage when the carrier is modulated, then > and only then do they have a reasonable _basis_ for making a claim about > peak (instantaneous) output power. > Article: 101640 of rec.radio.amateur.boatanchors From: Straydog Subject: Re: More on PEP, AM, average power, etc. Date: Thu, 26 Jan 2006 22:32:41 -0500 Message-ID: References: On Thu, 26 Jan 2006, Gary Schafer wrote: > On Thu, 26 Jan 2006 19:31:08 -0500, Straydog wrote: > >> >> >> On Thu, 26 Jan 2006, Gary Schafer wrote: >> >>> On Wed, 25 Jan 2006 22:09:48 -0500, Straydog wrote: >>> >>>> >>>> Since my earlier post (dealing with the question of what is peak evelope >>>> power output in an AM transmitter), I've been doing more scrutinizing >>>> of tube Ip/Vp characteristic curves. They are much more non-linear than >>>> the impression you get from just looking at the curves. Also, it is rare >>>> or almost non-existant to find Ip vs screen voltage! >>>> >>>> Lets look at the venerable 833 (from my RCA TT-3 transmitting tube >>>> manual). This is a KW input class C triode. >>>> >>>> From the curve: >>>> at zero grid volts, 1 kV on the plate gives 175 ma plate current >>>> 2 kV 500 ma >>>> That's more than a doubling of Ip for a doubling of Vp >>>> >>>> at minus 50 grid volts, 2 kV on the plate gives 50 ma plate current >>>> 4 kV 750 ma >>>> >>>> looking in my RCA receiving tube manual (RC-20) I found for a 6FG6 >>>> a sharp cutoff tetrode that only at zero grid volts was there a near >>>> linear relationship between plate current and plate voltage (meaning zero >>>> current at zero voltage, and a straight line [which actually deviated >>>> slightly from a straight line] with some slope. But at 100 v on plate, >>>> current was 14 milliamps, at 200 v on the plate, plate current was 34 >>>> miliamps. Definitely NOT a linear relationship. For the 6EM7 a triode, >>>> and at any of a wide range of grid voltages, plate current could be >>>> doubled with only a 15-20% increase in plate voltage. >>>> >>>> My thinking on all of this leads me to claim that anyone who can start >>>> with a 100 watt carrier from an AM transmitter and make a few assumptions >>>> about 100% modulation and come up with a _calculation_ of something like >>>> 400 watts of peak power and represent that as having something to do with >>>> reality is pure conjecture. >>>> >>>> If anyone wants to put an appropriate oscilloscope on the transmitter output >>>> and measure the RF voltage of unmodulated carrier into an appropriate load >>>> and then measure the peak RF voltage when the carrier is modulated, then >>>> and only then do they have a reasonable _basis_ for making a claim about >>>> peak (instantaneous) output power. >>> >>> You can't just look at static curves. Consider that with AM modulation >>> there is usually grid leak bias on the final tube being modulated. >>> This allows the grid voltage to somewhat follow the modulation and >>> helps smooth out the non-linearity in the plate. >> >> This was discussed in the RCA transmitting tube manual, but it also >> referenced the technical references which go into this in much more >> detail. However, if you want to say "you can't just look at static curves" >> then you also can't just say "doubling plate voltage also doubles plate >> current" either. >> >>> If you have access to any of Termans books, as peter said, there is an >>> excellent section on how modulation works. >>> He in fact shows that "plate current follows plate voltage almost >>> exactly with modulation". His words. >>> >>> He also says that "triodes have considerably less distortion than >>> screen grid tubes". >> >> I will decline to check this but words and phrases like "almost exactly" >> and "considerably less" are unquantitative. > > Do you even know who Terman is? Yep, and I've even looked in his books. But its more than I want to go into. > I would doubt that you do or you would not make statements like that. > As a matter of fact if you had read any of his work you would not be > making most of the statements that you are in these threads. I don't have the benefit of reading his works, I'm presuming that you have, is that correct? > At first I thought that you were interested in learning but I see you > would rather argue for the sake of arguing. Very early in my comments I brought up the issue of Ip being independend of Vp in all of the curves (these are facts) for tetrode and pentode transmitting tubes and receiving tubes and nobody but nobody called attention to the possibility that this conflict with claims of plate current doubling with plate voltage doubling could be resolved by including changes in screen voltage proportional, in some relationship, to changes in plate voltage. A few of your statements were a little bit helpful but even the comments in the RCA transmitting tube manual were weak in dealing with this issue. What is a further issue is why the FCC decided to drop steady DC input (easily measured with a plate current meter) in favor of making PEP output measurement the new criterion by which transmitter power is to be measured. The only thing I can think of is that there were, in the far past, some AM amateurs who were running some form of ultra modulation or super modulation and putting KWs of audio on a 1 KW DC input to the final signal and the FCC didn't like that. Maybe if any of you have some background on this, you could mention it. Article: 101642 of rec.radio.amateur.boatanchors From: Dr. Anton T. Squeegee Subject: Re: Double Super Hetrodyne what does this do in a CB Radio ? Date: Wed, 1 Feb 2006 22:09:38 -0800 Message-ID: References: <20812-43E0A7EB-453@storefull-3332.bay.webtv.net> In article <20812-43E0A7EB-453@storefull-3332.bay.webtv.net>, SeaView- USA@webtv.net (known to some as Captain Crane) scribed... > Hi, Does anyone know What Double Super Hetrodyne does in a CB radio. Yes. It gives the marketing dweebs something to write about. > I have a GE 40 channel cb and it has Double Super Hetrodyne. There is a possibility -- a very weak one -- that this bizarre market-speak means that the radio was designed with a double-conversion receiver. It's impossible to say without seeing a schematic. Why anyone would put that much effort and expense into a CB radio, however, is beyond me. I think you're running into nothing more that marketing buzzwords. "Double Super Heterodyne" certainly has no meaning in the technical world. -- Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute (Known to some as Bruce Lane, KC7GR) http://www.bluefeathertech.com -- kyrrin a/t bluefeathertech d-o=t calm "Salvadore Dali's computer has surreal ports..." Article: 101643 of rec.radio.amateur.boatanchors From: - exray - Subject: Re: Double Super Hetrodyne what does this do in a CB Radio ? Date: Thu, 02 Feb 2006 02:51:20 -0400 Message-ID: <11u3av9j07nt166@corp.supernews.com> References: <20812-43E0A7EB-453@storefull-3332.bay.webtv.net> Dr. Anton T. Squeegee wrote: > > There is a possibility -- a very weak one -- that this bizarre > market-speak means that the radio was designed with a double-conversion > receiver. It's impossible to say without seeing a schematic. > > Why anyone would put that much effort and expense into a CB radio, > however, is beyond me. I think you're running into nothing more that > marketing buzzwords. "Double Super Heterodyne" certainly has no meaning > in the technical world. I think it means something equivalent to "has ears and barks well into the next county bubba 10-4 beep". Okay, that was a nasty shot but there were indeed double-conversion rigs back in the CB heyday. When every other trailer in the court was running kilos of Bird-watts double talk conversion had its advantages. We're 10-8 and on the side bubba 10-4? beep. Gotcha comin on. Beep. I really don't know this lingo...I'm reading it off the side of a 1970s beer mug....a cheap mug at that. -Bill Article: 101644 of rec.radio.amateur.boatanchors Message-ID: <43E1B42B.6030601@aol.com> From: Bill Bird Subject: Need help on Central Electronics VFO 457 References: <1138848963.240455.308400@g43g2000cwa.googlegroups.com> Date: Thu, 02 Feb 2006 07:25:34 GMT Hi, I've just gotten my Central Electronics 20-A working nicely on cw into a dummy load on 3595 KHz using my one crystal. I've got a VFO 457 and VFO 458 that I'm wanting to begin using for my first time. I'm starting with the 457 and could use some help. Instead of a 0C3 tube the unit has a 0D3. Instead of a 1626 tube the unit has a VT135/12J5GT tube. The second 1629 tube has not been removed (no wire to top cap) The "Basic Modification of the BC-457, BC-458 or BC-459 as a VFO for Model 10 or 20 Multiphase Exciter for 12 Volt Operations" states at one point: "Remove the 1629 eye tube and also the 1625 located near the tuning shaft, Jumpers should be installed across the filament terminals of these unused sockets." I'm guessing having the second 1625 installed without a wire to the top cap might be just to provide the jumper across the filament terminal for its socket. I don't know where the 1629 eye tube used to be. I also wonder why the 0D3 and VT135/12J5GT are installed. I am thinking this VFO 457 was modified and working many years ago. This VFO 457 was hooked up to the 20-A when I got both units. Thanks for your help on the VFO 457 or any comments about the 457 vs the 458 since I will be trying to get both working but focused on the 457 for now. 73, Bill Bird KG0YJ Chesterfield, MO Article: 101645 of rec.radio.amateur.boatanchors From: " Uncle Peter" References: <20812-43E0A7EB-453@storefull-3332.bay.webtv.net> <11u3av9j07nt166@corp.supernews.com> Subject: Re: Double Super Hetrodyne what does this do in a CB Radio ? Message-ID: Date: Thu, 2 Feb 2006 06:16:33 -0500 "- exray -" wrote in message news:11u3av9j07nt166@corp.supernews.com... > Dr. Anton T. Squeegee wrote: > > I think it means something equivalent to "has ears and barks well into > the next county bubba 10-4 beep". > > Okay, that was a nasty shot but there were indeed double-conversion rigs > back in the CB heyday. When every other trailer in the court was > running kilos of Bird-watts double talk conversion had its advantages. > > We're 10-8 and on the side bubba 10-4? beep. Gotcha comin on. Beep. > > I really don't know this lingo...I'm reading it off the side of a 1970s > beer mug....a cheap mug at that. > > -Bill I assumed it meant double-conversion. Pete Article: 101646 of rec.radio.amateur.boatanchors Message-ID: <43E1B564.2080104@aol.com> From: Bill Bird Subject: Need help on Central Electronics VFO 457 Date: Thu, 02 Feb 2006 07:30:46 GMT (sorry for posting this twice, in error I posted as reply, hope this is better) Hi, I've just gotten my Central Electronics 20-A working nicely on cw into a dummy load on 3595 KHz using my one crystal. I've got a VFO 457 and VFO 458 that I'm wanting to begin using for my first time. I'm starting with the 457 and could use some help. Instead of a 0C3 tube the unit has a 0D3. Instead of a 1626 tube the unit has a VT135/12J5GT tube. The second 1629 tube has not been removed (no wire to top cap) The "Basic Modification of the BC-457, BC-458 or BC-459 as a VFO for Model 10 or 20 Multiphase Exciter for 12 Volt Operations" states at one point: "Remove the 1629 eye tube and also the 1625 located near the tuning shaft, Jumpers should be installed across the filament terminals of these unused sockets." I'm guessing having the second 1625 installed without a wire to the top cap might be just to provide the jumper across the filament terminal for its socket. I don't know where the 1629 eye tube used to be. I also wonder why the 0D3 and VT135/12J5GT are installed. I am thinking this VFO 457 was modified and working many years ago. This VFO 457 was hooked up to the 20-A when I got both units. Thanks for your help on the VFO 457 or any comments about the 457 vs the 458 since I will be trying to get both working but focused on the 457 for now. 73, Bill Bird KG0YJ Chesterfield, MO Article: 101647 of rec.radio.amateur.boatanchors Message-ID: <43E1BBB1.1060802@aol.com> From: Bill Bird Subject: VFO 457 questions Date: Thu, 02 Feb 2006 07:57:40 GMT (trying to get this posted correctly, quite rusty) Hi, I've just gotten my Central Electronics 20-A working nicely on cw into a dummy load on 3595 KHz using my one crystal. I've got a VFO 457 and VFO 458 that I'm wanting to begin using for my first time. I'm starting with the 457 and could use some help. Instead of a 0C3 tube the unit has a 0D3. Instead of a 1626 tube the unit has a VT135/12J5GT tube. The second 1629 tube has not been removed (no wire to top cap) The "Basic Modification of the BC-457, BC-458 or BC-459 as a VFO for Model 10 or 20 Multiphase Exciter for 12 Volt Operations" states at one point: "Remove the 1629 eye tube and also the 1625 located near the tuning shaft, Jumpers should be installed across the filament terminals of these unused sockets." I'm guessing having the second 1625 installed without a wire to the top cap might be just to provide the jumper across the filament terminal for its socket. I don't know where the 1629 eye tube used to be. I also wonder why the 0D3 and VT135/12J5GT are installed. I am thinking this VFO 457 was modified and working many years ago. This VFO 457 was hooked up to the 20-A when I got both units. Thanks for your help on the VFO 457 or any comments about the 457 vs the 458 since I will be trying to get both working but focused on the 457 for now. 73, Bill Bird KG0YJ Chesterfield, MO Article: 101648 of rec.radio.amateur.boatanchors From: "COLIN LAMB" References: <43E1BBB1.1060802@aol.com> Subject: Re: VFO 457 questions Message-ID: Date: Thu, 02 Feb 2006 14:26:36 GMT Q. Instead of a 0C3 tube the unit has a 0D3. A. Just a different regulated voltage. No magic about voltage. In fact, the builder may have found that the different voltage may have offered better stability - or it could have been he had one on hand. Q. Instead of a 1626 tube the unit has a VT135/12J5GT tube. A. Should be an equivalent tube. No big deal. A triode is a triode. Q. The second 1629 tube has not been removed (no wire to top cap) A. You apparently mean the 1625 power output tube. Should not make much difference. Maybe the builder did not have a place to put it. The original BC-457 had tubes in filaments in series - parallel so it could operate on the aircraft 24 - 28 volts. Most hams converted the wiring to 12 volts by paralleling everything. I recall most conversions supplied a separate filament transformer, and as long as the voltage required is equal to the transfromer voltage, you are fine. Hint, if it worked once, and no one rewired it, it will still work - unless one of the components has died due to aging. All the BC-457 conversion does is to use the triode oscillator circuit as an external vfo. Output from the vfo is taken from the grid circuit in the BC-457. It is a very easy circuit to understand. For 80 and 20 meters, you use 5 to 5.5 MHz. For some of the other bands, you must multiply the frequency of the vfo. That was often done in the 1625 section. But, much of the operation of the CE was done on 80 and 20 and the fellow who installed it may not have gotten any further. Colin K7FM Article: 101649 of rec.radio.amateur.boatanchors From: "Fred W4JLE" References: <20812-43E0A7EB-453@storefull-3332.bay.webtv.net> <11u3av9j07nt166@corp.supernews.com> Subject: Re: Double Super Hetrodyne what does this do in a CB Radio ? Date: Thu, 2 Feb 2006 11:49:04 -0500 Message-ID: <1c11f$43e23827$97d56b99$12757@ALLTEL.NET> A funny story, Years ago I used to work on HAM equipment and ran a small shop out of my basement. One day a CBer showed up with a Browning radio. After repairing the fault, I noticed a design flaw. A capacitor across the B+ was on the wrong side of the transmit relay. It allowed sufficient B+ to keep the transmitter alive when the unit went to receive and caused a feedback "ping". I corrected the default in design and returned the radio to the owner. He came back mad as a wet hen because his "Browning Ping" was gone. Being the curmudgeon I am, I put in a LARGE cap extending the ping to nearly a second. I thought that would really piss him off. Sad to say I had a wave of CBers wanting me to fix their pings like the first guy. "- exray -" wrote in message news:11u3av9j07nt166@corp.supernews.com... > Dr. Anton T. Squeegee wrote: > We're 10-8 and on the side bubba 10-4? beep. Gotcha comin on. Beep. > > I really don't know this lingo...I'm reading it off the side of a 1970s > -Bill Article: 101650 of rec.radio.amateur.boatanchors From: chris+news@suslowicz.org (Chris Suslowicz) Subject: Re: VFO 457 questions Date: Thu, 02 Feb 2006 21:16:21 +0000 Message-ID: References: <43E1BBB1.1060802@aol.com> In article <43E1BBB1.1060802@aol.com>, Bill Bird wrote: >(trying to get this posted correctly, quite rusty) > >Hi, > >I've just gotten my Central Electronics 20-A working nicely on cw into a dummy >load on 3595 KHz using my one crystal. I've got a VFO 457 and VFO 458 that I'm >wanting to begin using for my first time. I'm starting with the 457 and could >use some help. > >Instead of a 0C3 tube the unit has a 0D3. >Instead of a 1626 tube the unit has a VT135/12J5GT tube. >The second 1629 tube has not been removed (no wire to top cap) > > >The "Basic Modification of the BC-457, BC-458 or BC-459 as a VFO for Model 10 or > >20 Multiphase Exciter for 12 Volt Operations" states at one point: "Remove the >1629 eye tube and also the 1625 located near the tuning shaft, Jumpers should be > >installed across the filament terminals of these unused sockets." > >I'm guessing having the second 1625 installed without a wire to the top cap >might be just to provide the jumper across the filament terminal for its socket. > > I don't know where the 1629 eye tube used to be. I also wonder why the 0D3 >and VT135/12J5GT are installed. >From memory, the 1629 (magic eye) tube was at back left, an octal base crystal was fitted to the middle socket (the pair of these provided crystal calibration at 4.6MHz (on the 4 - 5.3 MHz unit), and the 1626 oscillator triode was in the right hand socket. If it still has the top case, the hinged flap has a mirror fitted over the 1629 position so that you can see the eye from the front of the unit. The 0D3 is just a regulator to stabilise the oscillator HT. Chris. -- "George Flynn told us at Ditto that he knew he'd been in fandom too long when he went to see THE SHINING and found himself evaluating the hotel's function space." --Richard Brandt Article: 101651 of rec.radio.amateur.boatanchors From: "Brian Hill" References: Subject: Re: National NC-155: Common or Uncommon? Message-ID: Date: Thu, 2 Feb 2006 20:24:37 -0600 "David Stinson" wrote in message news:xcoEf.9613$1n4.9108@newsread2.news.pas.earthlink.net... > How often does one see a National NC-155? > Decent receiver for a boatanchor? > Photos at: > http://home.mindspring.com/~arc5@ix.netcom.com/NC155/ Its a fairly rare set. I had one about 10 yers ago. i'd say their a decent radio when working right. BH Article: 101652 of rec.radio.amateur.boatanchors From: Dana Subject: Chair side radio for sale. Date: Thu, 2 Feb 2006 21:44:16 -0500 Message-ID: References: I have 1 in the Griffin, Georgia area for sale. Article: 101653 of rec.radio.amateur.boatanchors From: "Orv" References: <1138669094.511626.286550@g49g2000cwa.googlegroups.com> Subject: Re: How old are you? Message-ID: <7HzEf.24611$jR.5511@fed1read01> Date: Thu, 2 Feb 2006 19:00:34 -0800 wrote in message news:1138669094.511626.286550@g49g2000cwa.googlegroups.com... > Just a question that has been rattling around in the gourd. What age > group are B/A enthusiast-type folks here on the Net? I know we have the > folks from when they (the B/A's) were the most active (and I'm talking > SX11 here), but I wonder if there's a large following of Boomers that > picked up on it too. I only say this because I don't see as many > 30's-40's-50's people at the Hamfests and other gatherings as I see my > elders (Gentlemen, all). So the question bubbles up outta the tar? How > old are the folks on rec.radio.amateur.boatanchor? > rgds, Mark S. > will be 66 next month - continuously licensed since 1957 as KN0MBK. Orv W6LMP Article: 101654 of rec.radio.amateur.boatanchors From: Bob W7AVK Subject: FS: Fox Tango Yaesu Filters Message-ID: Date: Thu, 02 Feb 2006 19:12:48 -0800 For Sale: Two FOX TANGO FILTERS NUMBER XF-8.9HSN - 8 pole 1,900 hz Bandwidth XF-8.9HSW - 8 pole 2,800 hz Bandwidth Fits FT-One FT-107 FT 707 FT 901 DM FT 902 DM FT 101-ZD FT 980 FT-77 New Never used all paper work and FT box. $50.00 Each Or?// Trade? Includes postage 73 Bob W7AVK Article: 101655 of rec.radio.amateur.boatanchors From: " Ron in Radio Heaven" References: Subject: Re: Chair side radio for sale. Message-ID: Date: Fri, 03 Feb 2006 03:02:00 GMT Dana wrote in message news:Pine.NEB.4.63.0602022143210.7764@panix1.panix.com... > I have 1 in the Griffin, Georgia area for sale. > Do you think you could tell us a little about it? Condition, manufacture, model, etc... Ron Article: 101656 of rec.radio.amateur.boatanchors From: "Smokey" Subject: Wanted: WRL 755 or 755-A VFO Date: Fri, 3 Feb 2006 08:25:25 -0600 Message-ID: <11u6q5o2vpb7sa0@corp.supernews.com> Anyone have a WRL 755 or 755-A VFO to sell? Am looking for one in any condition. Will buy outright or have some other vintage boatanchory stuff to swap. Smokey telegrapher@hotmail.com Article: 101657 of rec.radio.amateur.boatanchors From: "Fred W4JLE" Subject: Henry 2kd classic coil needed Date: Fri, 3 Feb 2006 14:06:23 -0500 Message-ID: <122b4$43e3a9ea$97d56b99$17644@ALLTEL.NET> I am looking for the rotary inductor for the Henry 2KD Classic. Got one to sell? Drop me an e-mail with price. Fred W4JLE Article: 101658 of rec.radio.amateur.boatanchors From: "Caveat Lector" References: <1138669094.511626.286550@g49g2000cwa.googlegroups.com> Subject: Possible BA Collector Winner (Was How old are you?) Message-ID: Date: Fri, 3 Feb 2006 11:11:06 -0800 Age has nuttin to do wid it It's haw many boatanchors ya got Take a look at this -- the possible winner - URL: http://members.cox.net/wa6mhz/ Not Me but I do have my first radios - Hallicrafters S-40A and S-38 Ham since 1977 I'm 75 as well as I can remember -- CL -- I doubt, therefore I might be ! wrote in message news:1138669094.511626.286550@g49g2000cwa.googlegroups.com... > Just a question that has been rattling around in the gourd. What age > group are B/A enthusiast-type folks here on the Net? I know we have the > folks from when they (the B/A's) were the most active (and I'm talking > SX11 here), but I wonder if there's a large following of Boomers that > picked up on it too. I only say this because I don't see as many > 30's-40's-50's people at the Hamfests and other gatherings as I see my > elders (Gentlemen, all). So the question bubbles up outta the tar? How > old are the folks on rec.radio.amateur.boatanchor? > rgds, Mark S. > Article: 101659 of rec.radio.amateur.boatanchors From: john carson Subject: Re: How old are you? References: <1138669094.511626.286550@g49g2000cwa.googlegroups.com> <1138680630.827800.294360@g47g2000cwa.googlegroups.com> <1138687303.836655.56280@g44g2000cwa.googlegroups.com> <6fb77$43dfa16e$97d56b99$7163@ALLTEL.NET> <1138736876.391963.5950@z14g2000cwz.googlegroups.com> Message-ID: Date: Fri, 03 Feb 2006 22:12:54 GMT Litzendraht wrote: > Fred, I was a General at 11, a couple of weeks before my 12th birthday. > > John > 75 Learning to fix radios at 11. Carrer in electronics. Ham ticket 1959. John K3OPC Article: 101660 of rec.radio.amateur.boatanchors From: bg998@FreeNet.Carleton.CA (Martin Potter) Subject: Re: How old are you? Date: 4 Feb 2006 02:42:56 GMT Message-ID: References: <1138669094.511626.286550@g49g2000cwa.googlegroups.com> (nc183d@aol.com) writes: > Just a question that has been rattling around in the gourd. What age > Almost 65. Been listening to "short wave" since the early 50's (my Dad was licensed in 1933) but I didn't get my ticket till 1983. Advanced in '84. Have always liked BA stuff (all I could afford in the early years) expecially ex-military. Still have some of it but don't get on the air much. Have to do something about that. ... Martin VE3OAT Article: 101661 of rec.radio.amateur.boatanchors From: SeaView-USA@webtv.net (Captain Crane) Subject: Re: Double Super Hetrodyne what does this do in a CB Radio ? Date: Fri, 3 Feb 2006 19:58:59 -0800 Message-ID: <24057-43E42683-37@storefull-3333.bay.webtv.net> References: <1c11f$43e23827$97d56b99$12757@ALLTEL.NET> CB Radio is Still Fun !!!!. Its True DX Radio unlike using a ham - Trunking device and repeaters like CEL Phones Do. CB is Good Old Fashion AM ( REAL DX ) Radio. Brian , Las Vegas Article: 101662 of rec.radio.amateur.boatanchors From: - exray - Subject: Re: Double Super Hetrodyne what does this do in a CB Radio ? Date: Sat, 04 Feb 2006 00:52:03 -0400 Message-ID: <11u8cnhm6jn1295@corp.supernews.com> References: <1c11f$43e23827$97d56b99$12757@ALLTEL.NET> <24057-43E42683-37@storefull-3333.bay.webtv.net> Captain Crane wrote: > CB Radio is Still Fun !!!!. Its True DX Radio unlike using a ham - > Trunking device and repeaters like CEL Phones Do. > CB is Good Old Fashion AM ( REAL DX ) Radio. > Brian , Las Vegas > What does "using a ham" mean? -Bill Article: 101663 of rec.radio.amateur.boatanchors From: "Heytubeguy" Subject: FA:EXCELLENT TEN TEC OMNI VI+/MIC/TT PS Message-ID: Date: Sat, 04 Feb 2006 15:21:27 GMT Very nice TT Omni VI+ with mic and TT PS included! PSE NOTE RESTRICTIONS on SHIPPING/INSURANCE and required amateur call sign. Currently in use. See at: http://search.ebay.com/_W0QQfgtpZ1QQfrppZ25QQsassZheytubeguy Tnx for looking: more stuff coming: air variables, parts, transformers, chokes. Check back often,73 heytubeguy Article: 101664 of rec.radio.amateur.boatanchors From: " Uncle Peter" References: <1c11f$43e23827$97d56b99$12757@ALLTEL.NET> <24057-43E42683-37@storefull-3333.bay.webtv.net> <11u8cnhm6jn1295@corp.supernews.com> Subject: Re: Double Super Hetrodyne what does this do in a CB Radio ? Message-ID: Date: Sat, 4 Feb 2006 10:29:00 -0500 "- exray -" wrote in message news:11u8cnhm6jn1295@corp.supernews.com... > Captain Crane wrote: > > > CB Radio is Still Fun !!!!. Its True DX Radio unlike using a ham - > > Trunking device and repeaters like CEL Phones Do. > > CB is Good Old Fashion AM ( REAL DX ) Radio. > > Brian , Las Vegas > > > > What does "using a ham" mean? > > -Bill I think he intended to use It as a modifier for "trunking devices", etc. :) I guess the CB crowd abandoned SSB for good ol' Y-AM... Pete 10 Fer? Article: 101665 of rec.radio.amateur.boatanchors From: "Terry" References: <1138669094.511626.286550@g49g2000cwa.googlegroups.com> Subject: Re: How old are you? Message-ID: Date: Sat, 4 Feb 2006 13:24:32 -0330 wrote in message news:1138669094.511626.286550@g49g2000cwa.googlegroups.com... > Just a question that has been rattling around in the gourd. What age > group are B/A enthusiast-type folks here on the Net? > Occasional browser here at B/A. Was 11 when W.W.II ended. Got interested in 'electricity' at 12, while living in an all-gas house in NW United Kingdom. My Elmer was an uncle who gave me war surplus stuff, some of which I still have. Built first radio at age 13, completed after dropping a glass 6K7 that cost me several weeks pocket money! :-( Then got interested in war surplus 'Command Rxs', admiring, as I still do, their practical and neat construction. Learnt a lot, then spent 40 years in telecommunications industry in Uk and Canada. Retired from that in 1992 and spent 12 years in the catering business. Finally retired in 2004 again tinkering with electronics. Took 'transistor' course at local college of technology in 2005 scoring 80%+, so grey cells in this gourd still active; I think! Age 72 in a few week. Warm regards to all who post. Terry Article: 101666 of rec.radio.amateur.boatanchors From: "Heytubeguy" Subject: FA: GLASS HI VOLTAGE CAPS Message-ID: Date: Sat, 04 Feb 2006 20:26:02 GMT Just added hi voltage glass capacitors by Sprague, Gudeman; 4-10 KV DC; see at: http://search.ebay.com/_W0QQfgtpZ1QQfrppZ25QQsassZheytubeguy more air variables to be added soon, tnx for looking, heytubeguy Article: 101667 of rec.radio.amateur.boatanchors From: Edward Knobloch Subject: Re: Double Super Hetrodyne what does this do in a CB Radio ? References: <20812-43E0A7EB-453@storefull-3332.bay.webtv.net> Message-ID: <1GaFf.390$r53.239@trndny03> Date: Sat, 04 Feb 2006 23:21:33 GMT Captain Crane wrote: > Hi, Does anyone know What Double Super Hetrodyne does in a CB radio. > I have a GE 40 channel cb and it has Double Super Hetrodyne. > Brian - Las Vegas > Hi, If you go to wikipedia.org and search for "superheterodyne", it will explain the concept. The "double conversion superheterodyne" is explained in the wikipedia article, as a method of improved receiver image rejection. The article has plenty of links to lead you to further information, if desired. 73, Ed Knobloch Article: 101668 of rec.radio.amateur.boatanchors Message-ID: <43E55EF8.A9DD1093@earthlink.net> From: "Michael A. Terrell" Subject: Re: Double Super Hetrodyne what does this do in a CB Radio ? References: <1c11f$43e23827$97d56b99$12757@ALLTEL.NET> <24057-43E42683-37@storefull-3333.bay.webtv.net> <11u8cnhm6jn1295@corp.supernews.com> Date: Sun, 05 Feb 2006 02:13:04 GMT - exray - wrote: > > Captain Crane wrote: > > > CB Radio is Still Fun !!!!. Its True DX Radio unlike using a ham - > > Trunking device and repeaters like CEL Phones Do. > > CB is Good Old Fashion AM ( REAL DX ) Radio. > > Brian , Las Vegas > > > > What does "using a ham" mean? > > -Bill To me its the second thing on my recipe for a ham sandwich. ;-) -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida Article: 101669 of rec.radio.amateur.boatanchors From: Phil Witt Subject: Re: FA:EXCELLENT TEN TEC OMNI VI+/MIC/TT PS Message-ID: References: Date: Sat, 04 Feb 2006 20:18:52 -0600 On Sat, 04 Feb 2006 15:21:27 GMT, "Heytubeguy" wrote: >Very nice TT Omni VI+ with mic and TT PS included! PSE NOTE RESTRICTIONS on >SHIPPING/INSURANCE and required amateur call sign. Currently in use. See at: > >http://search.ebay.com/_W0QQfgtpZ1QQfrppZ25QQsassZheytubeguy > Nice. BidPay is out of business, BTW. Article: 101670 of rec.radio.amateur.boatanchors From: pltrgyst Subject: Re: How old are you? Date: Sun, 05 Feb 2006 00:30:01 -0500 Message-ID: References: <1138669094.511626.286550@g49g2000cwa.googlegroups.com> <1138680630.827800.294360@g47g2000cwa.googlegroups.com> <1138687303.836655.56280@g44g2000cwa.googlegroups.com> <6fb77$43dfa16e$97d56b99$7163@ALLTEL.NET> <1138736876.391963.5950@z14g2000cwz.googlegroups.com> <7no9u15b4ssesiqgvk2gm111i3q7a73v8k@4ax.com> <1139108242.309452.23230@g47g2000cwa.googlegroups.com> On 4 Feb 2006 18:57:22 -0800, "Litzendraht" wrote: >pltrgyst wrote: >> general 1960 (13), FCC first with CW endorsement 1961. > > Larry, that's quite an accomplishment. Exams in those days were >taken in person at an FCC field office. No answers were published. You >were strickly on your own. And the First Class ticket was really >something to be proud of. Thanks, but it didn't seem like a big deal. Several of my friends did the same thing -- we had the two very active local clubs I mentioned, and the FCC testing office in NYC was only 45 minutes away by train on our frequent shopping expeditions. The first did come in handy years later when I was working for RCA and they had their big strike, and hundreds of us non-radio/tv station employees filled in. 8;) Other than that, I never used it for employment. I don't miss the redundancy of short QSOs, but I did love cw. -- Larry Article: 101671 of rec.radio.amateur.boatanchors From: " Ron in Radio Heaven" Subject: 2006 CC-AWA Annual Conference Message-ID: Date: Sun, 05 Feb 2006 16:53:59 GMT Don't forget the CC-AWA Annual Conference in Charlotte NC, "The Spring Meet in the Carolinas" coming up on March 23-24-25. Hands down the best antique radio meet in the southeast. If you haven't made your reservations at the Sheraton, do it now. You can find all the details including a "Printable" Pre-registration form and instructions for paying you pre-reg fees via PayPal here; http://cc_awa.homestead.com/Charlotte.html It's going to be another GREAT year. We hope to see ya there. Article: 101672 of rec.radio.amateur.boatanchors From: mcalhoun@ksu.edu Subject: Re: How old are you? Date: 5 Feb 2006 12:26:51 -0600 Message-ID: References: <1138669094.511626.286550@g49g2000cwa.googlegroups.com> <1138680630.827800.294360@g47g2000cwa.googlegroups.com> <1138687303.836655.56280@g44g2000cwa.googlegroups.com> <6fb77$43dfa16e$97d56b99$7163@ALLTEL.NET> <1138736876.391963.5950@z14g2000cwz.googlegroups.com> <7no9u15b4ssesiqgvk2gm111i3q7a73v8k@4ax.com> >Grew up in NJ, with monthly trips down to NYC's "Radio Row" on Cortlandt Street Ah, the memories! I grew up in Florida and went to college in the midwest, but worked one summer for the Holmdel Bell Labs in New Jersey, and I still remember my one trip to NYC's Radio Row! (FWIW, I turned 65 last week.) -- --Myron A. Calhoun. Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge PhD EE (retired). "Barbershop" tenor. CDL(PTXS). W0PBV. (785) 539-4448 NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol) Article: 101673 of rec.radio.amateur.boatanchors From: mcalhoun@ksu.edu Subject: Re: schematic KAM All mode Date: 5 Feb 2006 13:05:48 -0600 Message-ID: References: >I wonder if anyone would have a schematic of the KAM All mode TNC. >Need to know where the reset pins are. >From page 30 ("HARD RESET") of Version 2.85 of Kantronics' "KAM KPC-4 KPC-2400 KPC-2 KPC-1 INSTALLATION MANUAL" [with added stuff in square brackets from the "KPC-3 REFERENCE MANUAL, version 5.0" just to make this answer more complete]: 1) Remove the PC board from the case as outlined in the Assembly and Disassembly section, above. 2) Locate the Test/Normal jumper which is labeled NOR T (normal-test). Jumpers are appropriately labeled on the PC board. Refer to the parts location diagram for help in locating them. KAM Jumper K6 KPC-1 Jumper K1 KPC-2 Jumper K3 [ KPC-3 Jumper J7 ] KPC-4 Jumper K7 KPC-2400 Jumper K3 Looking in the manual at the parts-placement "photo" between the "KAM Parts List" and "KAM HF MODEM" schematic pages (so this SHOULD be a "picture" of the KAM, but its only label is "KANTRONICS"!), with the connector end of the board closest to my body, I find a "T NORM" (NOT "NOR T"!) jumper labeled "K6" on the board edge adjacent to the BIGGEST IC (on the end farthest from the IC's notch). 3) Place the jumper in the test position [Place the jumper on both pins] 4) Apply power to the TNC 5) Observe on the computer display (your terminal program must be set at 300 Baud): EEPROM INIT OK [ CHECKSUM OK ] CHECKSUM OK [ RAM OK xxxK BYTES ] RAM OK XXXXX BYTES [ CLOCK NOT PRESENT ] REPLACE TEST JUMPER [ REPLACE TEST JUMPER ] Some TNCs will not display the REPLACE message. If you have removed the 2404 EEPROM from your unit for any reason, the EEPROM INIT message will read: EEPROM INIT ERROR This is a normal indication and does not indicate a failure with your TNC. 6) Turn power off. Do not keep the TNC power on for more than a minute or the regulator will overheat. 7) Return Test/Normal jumper to the normal position [Return jumper J7 to the normal position (one pin only).] 8) Reassemble the TNC and return to operation. Hope this helps. -- --Myron A. Calhoun. Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge PhD EE (retired). "Barbershop" tenor. CDL(PTXS). W0PBV. (785) 539-4448 NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol) Article: 101674 of rec.radio.amateur.boatanchors From: "John, N9JG" Subject: Equalizing resistors needed for HV diode string? Message-ID: Date: Sun, 05 Feb 2006 19:28:24 GMT Recently I have replaced the HV capacitor and diode strings in my L-4B. In addition to replacing the caps, the original equalizing resistors across the caps were each replaced with 100K, 2 watt ceramic composition resistors. The original HV diode string along with its equalizing bridge resistors were removed. The original diodes were replaced with 1N5408 diodes, but following a source (which I can no longer locate) I did not replace the equalizing resistors. The source had stated that modern diodes do not require the diodes to be bridged with equalizing resistors. The work was performed in August, 2005, and the amplifier has been working fine ever since. But I have this nagging feeling that the diodes do need to be bridged. Should I add equalizing resistors, or are my fears groundless? John, N9JG Article: 101675 of rec.radio.amateur.boatanchors From: " Uncle Peter" References: <1139168973.336334.320160@g44g2000cwa.googlegroups.com> Subject: Re: Equalizing resistors needed for HV diode string? Message-ID: Date: Sun, 5 Feb 2006 14:57:04 -0500 "Ed Engelken" wrote in message news:1139168973.336334.320160@g44g2000cwa.googlegroups.com... > No need to use the equalizing resistors. Modern diodes will "zener" > when reverse biased beyond their rated PIV. This will distribute the > inverse voltage across all the diodes. Just be sure to use enough > diodes in the string. > > Best Regards, > > Ed > I agree with Ed. Older diodes would breakdown, modern diodes will "Zener" and basically self protect in a series string. Pete Article: 101676 of rec.radio.amateur.boatanchors From: "John, N9JG" References: <1139168973.336334.320160@g44g2000cwa.googlegroups.com> Subject: Re: Equalizing resistors needed for HV diode string? Message-ID: Date: Sun, 05 Feb 2006 20:34:47 GMT Well, I was hoping the answer would be something like this. I expect a good nights sleep tonight, unless I think of something else to worry about! " Uncle Peter" wrote in message news:vMsFf.37636$bF.23635@dukeread07... > > "Ed Engelken" wrote in message > news:1139168973.336334.320160@g44g2000cwa.googlegroups.com... >> No need to use the equalizing resistors. Modern diodes will "zener" >> when reverse biased beyond their rated PIV. This will distribute the >> inverse voltage across all the diodes. Just be sure to use enough >> diodes in the string. >> >> Best Regards, >> >> Ed >> > > I agree with Ed. Older diodes would breakdown, modern diodes > will "Zener" and basically self protect in a series string. > > Pete > > Article: 101677 of rec.radio.amateur.boatanchors From: " Uncle Peter" References: <1139173749.276340.46280@o13g2000cwo.googlegroups.com> Subject: Re: recapping Hallicrafters S-38B question Message-ID: Date: Sun, 5 Feb 2006 17:33:08 -0500 wrote in message news:1139173749.276340.46280@o13g2000cwo.googlegroups.com... > > > John > John The wide blade (neutral) should be tied to the chassis side of the AC line. The AC switch (if it isn't wired this way already) should be wired to open the hot side of the AC leg. Tie the ground wire to the case. Make sure the cabinet to chassis insulators are in good condition--you don't want to have the neutral and ground leads tied together at the equipment! If R17 is open: that was probably caused by a defective rectifier (pins 3-7 on the filament tap open). Check the rectifier for an open filament on the 6 pilot lamp section. justradios.com out of Canada has an extensive line of AC rated caps. Pete k1zjh Article: 101678 of rec.radio.amateur.boatanchors From: - exray - Subject: Re: recapping Hallicrafters S-38B question Date: Sun, 05 Feb 2006 18:33:41 -0400 Message-ID: <11ucva3k9i62u87@corp.supernews.com> References: <1139173749.276340.46280@o13g2000cwo.googlegroups.com> johnrapp@bellsouth.net wrote: > > But replacing the two line to ground capacitors C27 .02 mfd, 600v and > C26, 400v.1 mfd (it says mfo on the schematic, but that must be a > misprint). I figure these are the line to ground capacitors, since they > are the only two on the schematic going from both lines to ground. > > I plan to replace the power cord with a bladed one. I plan to replace > C26 & C27 with Y2 safety capacitors. But cannot seem to find any at 400 > and 600 volts. The ones I can find are just 250 volts. > The 250 volts on the Y2 caps is an AC voltage rating. The 400 or 600 on the old caps is a DC voltage rating. They are generally good for about 250 vac as well but if you're buying, you might as well buy the AC rated ones. -Bill Article: 101679 of rec.radio.amateur.boatanchors From: BEAR Subject: WTB: Heathkit KNOBS - "indian" series rigs or parts rig Date: Sun, 05 Feb 2006 19:23:34 -0500 Message-ID: <11ud5kpapci78a4@corp.supernews.com> Looking for those zinc alloy die cast knobs from the Heath "indian" series rigs - Cheyenne, Apache, Mohawk, Seneca, etc... 1 or many. Will consider complete rig... working or not. Doing an overhaul of an Apache, need some knobbers... ;_) _-_-WBear2GCR Article: 101680 of rec.radio.amateur.boatanchors From: ricks_relics@att.net Subject: FA: Hallicrafters R-46 Speaker Message-ID: Date: Mon, 06 Feb 2006 02:42:16 GMT http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5863519119&rd=1&sspagename=STRK%3AMESE%3AIT&rd=1 Article: 101681 of rec.radio.amateur.boatanchors From: "John, N9JG" References: <1139168973.336334.320160@g44g2000cwa.googlegroups.com> <1139188883.389831.294420@g44g2000cwa.googlegroups.com> <1139206989.299093.92770@g14g2000cwa.googlegroups.com> Subject: Re: Equalizing resistors needed for HV diode string? Message-ID: Date: Mon, 06 Feb 2006 14:30:09 GMT I guess I should have done a bit more research before I posted my question. According to the 2005 ARRL Handbook (page 17.9) "shunting resistors are generally not needed across diodes in series rectifier strings. In fact, shunt resistors can actually create problems because they can produce a low-impedance source of damaging current to any diode that may have reached avalanche potential." It appears as if the Handbook agrees with you. John, N9JG "Chuck Harris" wrote in message news:KsqdnTZMtoE5zXrenZ2dnUVZ_sWdnZ2d@rcn.net... [stuff] > The equalization resistors were used with the thought that they would > swamp the leakage current of the diodes in the reverse biased condition, > and make sure that each diode saw only its equal share of voltage. > The truth of the matter is the reverse leakage current will start to > rise rapidly when the diode starts entering its avalanche region, and > the next leakiest diode in the string will start to take over when the > leakiest one starts thinking about avalanching. The string balances, > and protects, itself. > > -Chuck Article: 101682 of rec.radio.amateur.boatanchors From: kludge@panix.com (Scott Dorsey) Subject: Re: Equalizing resistors needed for HV diode string? Date: 6 Feb 2006 10:32:34 -0500 Message-ID: References: <1139206989.299093.92770@g14g2000cwa.googlegroups.com> Please be aware of that fact that high voltage multi-junction diodes for microwave ovens are available for next to nothing and can be a good substitute for long diode strings with a single element. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." Article: 101683 of rec.radio.amateur.boatanchors From: "Smokey" Subject: Boatanchors and estates: Ideas? Date: Mon, 6 Feb 2006 10:12:07 -0600 Message-ID: <11ueth6djbb71aa@corp.supernews.com> This isn't exactly a pleasant subject but I am interested if anyone has any suggestions of organization that are interested in complete boatanchors estates. I have contacted one organization which is very selective and I believe if someone is generous enough to put in their will that they will bequeeth their whole ham station to an organization there should at least be a little enthusiasm on the part of the organization. Does anyone know of any good causes to whom a person can donate his prized equipment, QSLs, tools etc etc where it will be treasured and appreciated after I am gone? Smokey Please remove "nospam" from email address when replying directly. Article: 101684 of rec.radio.amateur.boatanchors From: Ron Subject: Re: Boatanchors and estates: Ideas? Date: 06 Feb 2006 11:52:42 EST Message-ID: <43E78025.70702@yahoo.com> References: <11ueth6djbb71aa@corp.supernews.com> I would expect than other than other individuals there is no organization that would know what the stuff is. I believe you had better sell it before you depart which will probably but them in good homes for at least a while. It seems to be that libraries throw books away, museums auctioned stuff off or keep stuff in buildings that leak or basements that are full of mildew so that is left? Ron Smokey wrote: > This isn't exactly a pleasant subject but I am interested if anyone has any > suggestions of organization that are interested in complete boatanchors > estates. I have contacted one organization which is very selective and I > believe if someone is generous enough to put in their will that they will > bequeeth their whole ham station to an organization there should at least > be a little enthusiasm on the part of the organization. Does anyone know of > any good causes to whom a person can donate his prized equipment, QSLs, > tools etc etc where it will be treasured and appreciated after I am gone? > > Smokey > > Please remove "nospam" from email address when replying directly. > > > Article: 101685 of rec.radio.amateur.boatanchors From: "W6KRC" Subject: FS: Tube type 6080WC $2.00 each Message-ID: Date: Mon, 6 Feb 2006 10:37:49 -0800 I have 24 used untested 6080WC's that were pulled from government surplus equipment. I will sell them for $2.00 each (no minimum order) plus actual postage. If interested please email me at W6KRC"at"ARRL.net. Murray Article: 101686 of rec.radio.amateur.boatanchors From: ritchi50@optonline.net Subject: FS Yaesu FT-767 GX HF Rig Message-ID: Date: Mon, 06 Feb 2006 14:22:28 -0500 FS Yaesu FT-767 GX HF Rig Looks and works fine. Price: 475.00 Shipped and insured to the lower 48 States. So free shipping and insurance. Reply email......Rich Article: 101687 of rec.radio.amateur.boatanchors From: ritchi50@optonline.net Subject: FS FT-767 Band Units 50/144/440 Message-ID: <029fu11o597tqj8afd3mi0qtke0rc84brc@4ax.com> Date: Mon, 06 Feb 2006 14:32:22 -0500 FS FT-767 Band Units 50/144/440 50 Mhz band unit 200.00 Shipped and insured FREE 1440 Mhz Band unit 125.00 Shipped and insured FREE 144.00 Mhz Band unit 125.00 Shipped and insured FREE reply email Rich Article: 101688 of rec.radio.amateur.boatanchors From: mcalhoun@ksu.edu Subject: Re: Equalizing resistors needed for HV diode string? Date: 6 Feb 2006 13:53:46 -0600 Message-ID: References: <1139206989.299093.92770@g14g2000cwa.googlegroups.com> >Please be aware of that fact that high voltage multi-junction diodes for >microwave ovens are available for next to nothing and can be a good >substitute for long diode strings with a single element. Now THAT's a good idea! Any idea how to test USED ones? On my morning school-bus route, I see about one discarded microwave oven per month, and if they're not too far from the bus-barn, I return later, "liberate" them from the "sidewalk store" and tear them apart for their super-strong magnets which my grandkids really enjoy. But I've also been saving the transformers, diodes, fans, and capacitors, with the ultimate goal of making a high-voltage power supply for a homebrew amplifier. So, without any high-tech equipment, how might those diodes be tested? -- --Myron A. Calhoun. Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge PhD EE (retired). "Barbershop" tenor. CDL(PTXS). W0PBV. (785) 539-4448 NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol) Article: 101689 of rec.radio.amateur.boatanchors From: Straydog Subject: Re: Boatanchors and estates: Ideas? Date: Mon, 6 Feb 2006 15:18:38 -0500 Message-ID: References: <11ueth6djbb71aa@corp.supernews.com> On Mon, 6 Feb 2006, w4pqw@cox.net wrote: > This is a good idea. BUT,I can think of lots of "side effects" to it.. > Mostly technical..A great percentage of estate radio equipment is > obsolete,broken,needing unavailable parts, etc. New hams are not > usually interested in books,tech data ,construction tools ,material > etc.sad but true..Some radio clubs will take estates and sort them out > ,direct the items to someone that will appreciate them..A radio club > would be my suggestion.. good luck..W4PQW > > Another problem: I went to look at a deceased ham's station that the widow wanted to get rid of and somehow the widow, who didn't know much about the value of used gear but could look up stuff in a recent QST, thought that the "package" (including peripheral stuff) she wanted to sell was for full list price new (even for gear that was 20+ years old). No, we're not talking about Collins or rare Halicrafters, either. And, she told me "Well, I'm not going to give it away" when I offered what it was worth to me (and I only wanted a small fraction of it, and not that badly either). And, I didn't even begin to explain about why I might want to have to take some time to _test_ the stuff to my own satisfaction or that you don't sell used cars at new car prices. And, I'd want a test drive, too. Article: 101690 of rec.radio.amateur.boatanchors From: " Uncle Peter" References: <1139206989.299093.92770@g14g2000cwa.googlegroups.com> Subject: Re: Equalizing resistors needed for HV diode string? Message-ID: <%xOFf.37846$bF.32540@dukeread07> Date: Mon, 6 Feb 2006 15:43:27 -0500 wrote in message news:ds89ga$283@unix1.cc.ksu.edu... > > super-strong magnets which my grandkids really enjoy. But I've also been > saving the transformers, diodes, fans, and capacitors, with the ultimate > goal of making a high-voltage power supply for a homebrew amplifier. So, > without any high-tech equipment, how might those diodes be tested? > -- > --Myron A. Calhoun. Those transformers had magnetic shunts that limited the current they can deliver. There's been some discussion about using them in the ham press over the past several years. I think the inagural issue of Communications Quarterly covered it in some detail. You'll probably have to do some simple mechanical mods to the power transformers. Pete Article: 101691 of rec.radio.amateur.boatanchors From: "Chris Martin" Subject: Owner's Manuals Date: Mon, 6 Feb 2006 16:32:20 -0500 Message-ID: Does anyone have copies of owner's manuals/schematics for: 1. Hallicrafters S-108 and 2. Hammarlund HQ-110? (without clock) Will pay for photocopies or if someone can scan them and send them email that would be greatly appreciated. Thanks, Chris Article: 101692 of rec.radio.amateur.boatanchors From: "Leanne" Subject: Re: Boatanchors and estates: Ideas? Date: Mon, 6 Feb 2006 19:31:46 -0500 Message-ID: References: <11ueth6djbb71aa@corp.supernews.com> <1139247460.685572.237660@o13g2000cwo.googlegroups.com> wrote in message news:1139247460.685572.237660@o13g2000cwo.googlegroups.com... > This is a good idea. BUT,I can think of lots of "side effects" to it.. > Mostly technical..A great percentage of estate radio equipment is > obsolete,broken,needing unavailable parts, etc. New hams are not > usually interested in books,tech data ,construction tools ,material > etc.sad but true..Some radio clubs will take estates and sort them out > ,direct the items to someone that will appreciate them..A radio club > would be my suggestion.. good luck..W4PQW I have reached the point to where I am ridding myself of stuff that the heirs would throw in the dumpster. I have sold or given to a good home most of my boat anchors and what is left, I will get rid of after making sure they are functional. If not then I will advertise them as parts. Some projects that are no longer important, have gone away. Leanne - W1WXS