Re: [AMRadio] BC-610 down=up
In a message dated 10/26/05 1:59:40 PM, [EMAIL PROTECTED] writes: > As to folks ideas as to what constitutes a "long" wire, THE manual AND the > tuning cards for the BC-610 are VERY specific about the 44 ft for 80, 40, & > 20 mtr bands, AND is very specific about the 77ft for 160 mtrs > > The BC-939 is used EITHER for a 25ft vertical whip, or the above mentioned > wire lengths. When using the wire lengths as stated in the manual and tuning > cards, you MUST place the switch on the fron to the "Long Wire" position. > The Army can call a 44 or 77 ft end fed wire antenna anything they want. The point, though, which I trust by now has been more than adequately made, it not to expect a stock BC-939 to work with the "long" wires most commonly used by hams and described in ham literature. As I said before, I agree that the 939 works fine with the antennas for which it was designed. In the past I owned the gray painted version of the device which came with my T368s. Full of nice components and very well made but wouldn't match any of the antennas I had in use at the time. Dennis D. W7QHO Glendale, CA
Re: [AMRadio] BC-610 down=up
The BC-610, and the HT4-B both have the same final configuration, according to schematics I have for both. A link-coupled output, at least in this instance, can feed either a balanced or an unbalanced line. With both ends of the output link above ground, and attached to a balanced feeder, or load, the link can be adjusted to match the output to that load (unless that load is very much out of range out of range). With one end of the link to ground (often through a variable capacitor), and the other end above ground, and conected to an unbalanced load, the link can match an unbalanced load, such as a 50 coax. This scenario is entirely independent of whether the final is push-pull or single-ended. It comes under the broad defination of "transformation". 73, Barrie, W7ALW - Original Message - From: "Mike Sawyer" <[EMAIL PROTECTED]> To: "Discussion of AM Radio" Sent: Wednesday, October 26, 2005 7:34 PM Subject: Re: [AMRadio] BC-610 down=up The BC-610 has an un-balanced output. Generally, had it been 'push-pull', it would have been with a balanced output. In essence, it only utilizes half the coil on the jack bar. I just had this very same conversation not too long ago. Mike(y) W3SLK - Original Message - From: "Barrie Smith" <[EMAIL PROTECTED]> To: "Discussion of AM Radio" Sent: Wednesday, October 26, 2005 8:47 PM Subject: Re: [AMRadio] BC-610 down=up Just curious, here. Someone mentioned that the BC-610 has a 50 ohm output. Well, I don't remember ever having seen a BC-610, but I do have an HT4-B (the civilian version of the BC-610, made in 1938), which does not (in stock form, at least) have a 50 ohm output, it has a balanced output. So, I may be talking about, and giving advice about, something else. 73, Barrie, W7ALW __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami
Re: [AMRadio] BC-610 down=up
The BC-610 has an un-balanced output. Generally, had it been 'push-pull', it would have been with a balanced output. In essence, it only utilizes half the coil on the jack bar. I just had this very same conversation not too long ago. Mike(y) W3SLK - Original Message - From: "Barrie Smith" <[EMAIL PROTECTED]> To: "Discussion of AM Radio" Sent: Wednesday, October 26, 2005 8:47 PM Subject: Re: [AMRadio] BC-610 down=up Just curious, here. Someone mentioned that the BC-610 has a 50 ohm output. Well, I don't remember ever having seen a BC-610, but I do have an HT4-B (the civilian version of the BC-610, made in 1938), which does not (in stock form, at least) have a 50 ohm output, it has a balanced output. So, I may be talking about, and giving advice about, something else. 73, Barrie, W7ALW __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami
Re: [AMRadio] BC-610 down=up
Just curious, here. Someone mentioned that the BC-610 has a 50 ohm output. Well, I don't remember ever having seen a BC-610, but I do have an HT4-B (the civilian version of the BC-610, made in 1938), which does not (in stock form, at least) have a 50 ohm output, it has a balanced output. So, I may be talking about, and giving advice about, something else. 73, Barrie, W7ALW
RE: [AMRadio] BC-610 down=up and burnt't finals
That would be class AB1 6146s in the speech amplifier. Yep I guess I do know it pretty well. The final was built in a push pull configuration complete except for the extra tube and the extra neutralizing capacitor. Otis said, "I never put the other tube in because, I didn't want to be accused of running illegal power". I operated that station more than any other visitor to Otis's place and many times when he was away on trips to San Antonio and other places with his mobile rig in the old black Cadillac. The rig ran 3000 volts on the plates of final and modulators and the final current was about 300 ma. The antenna was about 70 ft. high and pretty near flat top. The RF current meter that was in the RG8 coax line read 4 amps, until he went to the folded dipole with 300 OHM feed line. So for anybody that thinks Otis was ever illegal (OVER 1KW DC input) HE WAS NOT John, WA5BXO -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of W5OMR/Geoff Sent: Wednesday, October 26, 2005 5:43 PM To: Discussion of AM Radio Subject: Re: [AMRadio] BC-610 down=up and burnt't finals His homebrew speech-amp uses a pair of 6146's in Class B, to drive the push-pull 833's. 73 = Best Regards, -Geoff/W5OMR __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami
Re: [AMRadio] BC-610 down=up and burnt't finals
John E. Coleman (ARS WA5BXO) wrote: <>Not disputing any of what you said Bob. I just remembered a funny situation where Otis, K5SWK, had some one else at his rig controls. The rig was and is single 833 modulated by a pair and this story was of many years ago. The person at the controls is now a silent key but I still won't mention his name. The story goes that Otis was down the street buying cigarettes, beer or something, and this person was visiting from out of town. Not realizing the rig had had a arc over on the tuning capacitor, that is never experiencing anything of that size before, the operator continued to talk while the big pole pegs melted the plate of the 833 in the final. The 833 had a hole burnt through the plate the size of a half dollar after the circuit breaker on the house when pop. The funny part of this story is that that tube was a very good tube and continued to work perfectly with out even a drop in grid current at full output. I ask Otis if the tube showed any color and he said that he could not see the other side but that on the side facing him there was no place for the tube to show color. He did change the tube later because he said that it was just too weird to look at the grid and heater through the hole and not see the normal little red glow that was supposed to be there on the plate. John, WA5BXO Otis's rig, is the only rig I know, that could be operated with only 1 of the pair of 833's in the modulator lit up, and no one could tell the difference. His homebrew exciter was supposed to use a 4-65, but the only 4-65 he had got damaged, or something, so he hastily lashed up an adapter plate for a pair of 6146's. Those are probably the same tubes that are in the exciter. His homebrew speech-amp uses a pair of 6146's in Class B, to drive the push-pull 833's. Everything in that station was homebrew. Oh, I don't mean he wound his own resistors, or blew glass to make tubes out of, but you know what I mean.. gather up a bunch of parts, assemble 'em in such a way as to cooerce a butt-load of electrons out of the wall, into thin air, and have 'em reappear at the other end intact, again. Ah, the magic of Radio and homebrewing! I know you know all about the station there, John... but not everyone knows Otis' rig (or Otis, for that matter!) like you do. Sure miss hearing that signal on the air. Sure will be good to get him back on, soon. -- 73 = Best Regards, -Geoff/W5OMR
RE: [AMRadio] BC-610 down=up and burnt't finals
Not disputing any of what you said Bob. I just remembered a funny situation where Otis, K5SWK, had some one else at his rig controls. The rig was and is single 833 modulated by a pair and this story was of many years ago. The person at the controls is now a silent key but I still won't mention his name. The story goes that Otis was down the street buying cigarettes, beer or something, and this person was visiting from out of town. Not realizing the rig had had a arc over on the tuning capacitor, that is never experiencing anything of that size before, the operator continued to talk while the big pole pegs melted the plate of the 833 in the final. The 833 had a hole burnt through the plate the size of a half dollar after the circuit breaker on the house when pop. The funny part of this story is that that tube was a very good tube and continued to work perfectly with out even a drop in grid current at full output. I ask Otis if the tube showed any color and he said that he could not see the other side but that on the side facing him there was no place for the tube to show color. He did change the tube later because he said that it was just too weird to look at the grid and heater through the hole and not see the normal little red glow that was supposed to be there on the plate. John, WA5BXO -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Wednesday, October 26, 2005 3:58 PM To: Discussion of AM Radio; Discussion of AM Radio Subject: Re: [AMRadio] BC-610 down=up As to folks ideas as to what constitutes a "long" wire, THE manual AND the tuning cards for the BC-610 are VERY specific about the 44 ft for 80, 40, & 20 mtr bands, AND is very specific about the 77ft for 160 mtrs The BC-939 is used EITHER for a 25ft vertical whip, or the above mentioned wire lengths. When using the wire lengths as stated in the manual and tuning cards, you MUST place the switch on the fron to the "Long Wire" position. Seems interesting to me that this old radio was used in WWII, Korea, AND Viet Nam with all of this working JUST FINE. If you don't like the BC-939 and its settings, you just erect dipoles for each band desired. Just DON'T use a trap dipole. You WIL NOT get a proper tune and load! Of course if you want to stock up on a BUNCH of 250THs, you CAN have it you way. I've got one that someone sent me when they insisted on THEIR way. There is very definitive light all the way through opposing sides in the middle of the plate. YMMV Bob - N0DGN My 250THs are just fine! > On 10/26/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > > > > In a message dated 10/25/05 8:18:51 PM, [EMAIL PROTECTED] writes: > > > > > Actually, > > > The BC-939 (*) handles an end fed long wire, the recommended length for > > > 2 - 18 Mhz is 44 feet. That number changes to 77 feet for 160 meters and > > > works quite well. > > > > > Actually, a 44 (or 77) ft antenna is not a very "long" wire even at 18 MHz. > > The term is usually used to describe wires measured in wavelengths as > > opposed to feet and inches, see various ARRL and other antenna books. > > Apparently Hallicrafters and/or the military considered it long enough > to qualify since the 3 position switch on front of the tuner has 'long > wire' specifically listed in the center position. My guess is that > they considered any random length beyond what would qualify as a > 'whip' to be a long wire, perhaps in the spirit of the original term. > > The odd thing about my A model is that the lower vacuum cap has been > removed and replaced with an air capacitor, screwed to the base with > heavy wire soldered to each of the two clips. It resembles a moderate > sized air variable but with only 5-6 stationary plates. Looks to > either be factory installed or later upgraded. Haven't had time yet to > investigate the value or rating. > > Very well-built piece of equipment, even if it has limited utility. > > ~ Todd/'Boomer' KA1KAQ > __ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami
Re: [AMRadio] BC-610 down=up
As to folks ideas as to what constitutes a "long" wire, THE manual AND the tuning cards for the BC-610 are VERY specific about the 44 ft for 80, 40, & 20 mtr bands, AND is very specific about the 77ft for 160 mtrs The BC-939 is used EITHER for a 25ft vertical whip, or the above mentioned wire lengths. When using the wire lengths as stated in the manual and tuning cards, you MUST place the switch on the fron to the "Long Wire" position. Seems interesting to me that this old radio was used in WWII, Korea, AND Viet Nam with all of this working JUST FINE. If you don't like the BC-939 and its settings, you just erect dipoles for each band desired. Just DON'T use a trap dipole. You WIL NOT get a proper tune and load! Of course if you want to stock up on a BUNCH of 250THs, you CAN have it you way. I've got one that someone sent me when they insisted on THEIR way. There is very definitive light all the way through opposing sides in the middle of the plate. YMMV Bob - N0DGN My 250THs are just fine! > On 10/26/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > > > > In a message dated 10/25/05 8:18:51 PM, [EMAIL PROTECTED] writes: > > > > > Actually, > > > The BC-939 (*) handles an end fed long wire, the recommended length for > > > 2 - 18 Mhz is 44 feet. That number changes to 77 feet for 160 meters and > > > works quite well. > > > > > Actually, a 44 (or 77) ft antenna is not a very "long" wire even at 18 > > MHz. > > The term is usually used to describe wires measured in wavelengths as > > opposed to feet and inches, see various ARRL and other antenna books. > > Apparently Hallicrafters and/or the military considered it long enough > to qualify since the 3 position switch on front of the tuner has 'long > wire' specifically listed in the center position. My guess is that > they considered any random length beyond what would qualify as a > 'whip' to be a long wire, perhaps in the spirit of the original term. > > The odd thing about my A model is that the lower vacuum cap has been > removed and replaced with an air capacitor, screwed to the base with > heavy wire soldered to each of the two clips. It resembles a moderate > sized air variable but with only 5-6 stationary plates. Looks to > either be factory installed or later upgraded. Haven't had time yet to > investigate the value or rating. > > Very well-built piece of equipment, even if it has limited utility. > > ~ Todd/'Boomer' KA1KAQ > __ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami
Re: [AMRadio] 300-G RF exiter
Eric, WB4VVI(SK), told me that the 6000 tube was essentially a 6L6 with the pins moved around and filament voltage raised. I guess you can use a 25AV5 as a drop in replacement for it with a little less drive. I have an exciter deck and got the more common 6AV5. The reason is that the tube's wires for the filament are on a separate line. Therefore, you could hook-up whatever flavor filament transformer that will meet your needs. Mike(y) W3SLK - Original Message - From: "VJB" <[EMAIL PROTECTED]> To: Sent: Wednesday, October 26, 2005 8:09 AM Subject: [AMRadio] 300-G RF exiter Todd, The T368 exciter deck that I'm using retains the 10 watt Type 6000 tube in there, and drives the 807s instead of the 6L6 buffer that was in there. It would be too hot to drive the oscillator module, plus, I needed the space to park the exciter deck. The feedline needs to be kept short, I presume you know, or the coax capacitance gets out of hand. OK on your timetable, here's hoping you'll be up in time for one of the big AM events. Maybe you'll even become a cover boy -- as seen here with No. 147 : http://www.netohio.com/wa3vjb/ER_189_Cover.jpg __ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami
Re: [AMRadio] BC-610 down=up
The way I understand is that the BC-939 was a helluva TVI generator. What is neat is that they used the exact same thing for the BC-610's younger brother, the T-368. Only difference is they put it in a battleship grey box. Mike(y) W3SLK - Original Message - From: "Todd, KA1KAQ" <[EMAIL PROTECTED]> To: "Discussion of AM Radio" Sent: Wednesday, October 26, 2005 9:23 AM Subject: Re: [AMRadio] BC-610 down=up On 10/26/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > > In a message dated 10/25/05 8:18:51 PM, [EMAIL PROTECTED] writes: > > > Actually, > > The BC-939 (*) handles an end fed long wire, the recommended length for > > 2 - 18 Mhz is 44 feet. That number changes to 77 feet for 160 meters and > > works quite well. > > > Actually, a 44 (or 77) ft antenna is not a very "long" wire even at 18 > MHz. > The term is usually used to describe wires measured in wavelengths as > opposed to feet and inches, see various ARRL and other antenna books. Apparently Hallicrafters and/or the military considered it long enough to qualify since the 3 position switch on front of the tuner has 'long wire' specifically listed in the center position. My guess is that they considered any random length beyond what would qualify as a 'whip' to be a long wire, perhaps in the spirit of the original term. The odd thing about my A model is that the lower vacuum cap has been removed and replaced with an air capacitor, screwed to the base with heavy wire soldered to each of the two clips. It resembles a moderate sized air variable but with only 5-6 stationary plates. Looks to either be factory installed or later upgraded. Haven't had time yet to investigate the value or rating. Very well-built piece of equipment, even if it has limited utility. ~ Todd/'Boomer' KA1KAQ __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami
[AMRadio] Hammarlund HQ170s FS
Have an HQ-170 and HQ-170C. Both work OK but probably could use tube check and alignment. Haven't had time to work with them . No dents, rust,etc but a couple of spots w/ paint rub off. Font panel gud. Gud shape otherwise. 170C has an original manual & other has schematic & alignment docs. Picture at http://www.qsl.net/wa0ahq/hq170.jpg Asking $200+shipping for HQ170 and $225+shipping for the 170C. Dick WA0AHQ I will insure.
Re: [AMRadio] BC-610 down=up
On 10/26/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > > In a message dated 10/25/05 8:18:51 PM, [EMAIL PROTECTED] writes: > > > Actually, > > The BC-939 (*) handles an end fed long wire, the recommended length for > > 2 - 18 Mhz is 44 feet. That number changes to 77 feet for 160 meters and > > works quite well. > > > Actually, a 44 (or 77) ft antenna is not a very "long" wire even at 18 MHz. > The term is usually used to describe wires measured in wavelengths as > opposed to feet and inches, see various ARRL and other antenna books. Apparently Hallicrafters and/or the military considered it long enough to qualify since the 3 position switch on front of the tuner has 'long wire' specifically listed in the center position. My guess is that they considered any random length beyond what would qualify as a 'whip' to be a long wire, perhaps in the spirit of the original term. The odd thing about my A model is that the lower vacuum cap has been removed and replaced with an air capacitor, screwed to the base with heavy wire soldered to each of the two clips. It resembles a moderate sized air variable but with only 5-6 stationary plates. Looks to either be factory installed or later upgraded. Haven't had time yet to investigate the value or rating. Very well-built piece of equipment, even if it has limited utility. ~ Todd/'Boomer' KA1KAQ
Re: [AMRadio] 300-G RF exiter
VJB wrote: Todd, The T368 exciter deck that I'm using retains the 10 watt Type 6000 tube in there, and drives the 807s instead of the 6L6 buffer that was in there. It would be too hot to drive the oscillator module, plus, I needed the space to park the exciter deck. The feedline needs to be kept short, I presume you know, or the coax capacitance gets out of hand. OK on your timetable, here's hoping you'll be up in time for one of the big AM events. Maybe you'll even become a cover boy -- as seen here with No. 147 : http://www.netohio.com/wa3vjb/ER_189_Cover.jpg Ain't that 3HUZ/Butch on the cover? Dave/QCU was wondering why you weren't on 75m this morning. Had a nice short chat with Dave. Since they've now gone to 4 10hr days at work, he doesn't have as much time in the mornings. Maybe catch ya in the morning? -- 73 = Best Regards, -Geoff/W5OMR
[AMRadio] 300-G RF exiter
Todd, The T368 exciter deck that I'm using retains the 10 watt Type 6000 tube in there, and drives the 807s instead of the 6L6 buffer that was in there. It would be too hot to drive the oscillator module, plus, I needed the space to park the exciter deck. The feedline needs to be kept short, I presume you know, or the coax capacitance gets out of hand. OK on your timetable, here's hoping you'll be up in time for one of the big AM events. Maybe you'll even become a cover boy -- as seen here with No. 147 : http://www.netohio.com/wa3vjb/ER_189_Cover.jpg __ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com
[AMRadio] DX60B
David- Back in the Fall of 1967, I was first licensed as a Novice as WN2CXS in my hometown of Passaic, New Jersey. My first transmitter was a Heathkit DX-60B. My father and I constructed it from kit form in his basement tool shed. I believe we purchased it at the Heathkit store in NYC. I used crystals and never purchased the HG-10 VFO. It worked quite faithfully until I got my General in 1968 (WA2CXS), sold it (drat!!!) and put an E.F. Johnson Viking II transmitter with matching external VFO and a National NC-300 receiver on the air. Fond memories. I never thought to save my original Novice station. Good Luck on it's restoration. Best 73's, Bob K5SEP
Re: [AMRadio] BC-610 down=up
In a message dated 10/25/05 8:18:51 PM, [EMAIL PROTECTED] writes: > Actually, > The BC-939 (*) handles an end fed long wire, the recommended length for > 2 - 18 Mhz is 44 feet. That number changes to 77 feet for 160 meters and > works quite well. > Actually, a 44 (or 77) ft antenna is not a very "long" wire even at 18 MHz. The term is usually used to describe wires measured in wavelengths as opposed to feet and inches, see various ARRL and other antenna books. Agree the BC-939 works well when used with the short antennas for which it was designed. Dennis D. W7QHO Glendale, CA
