Re: [AMRadio] Schematic Needed
BTW Jim, forgot to ask in previous e-mail...what is the problem with your G-50 Modulation?? Surely you dont want more than 90%?? 73 again. K0NG. Quoting Jim candela <[EMAIL PROTECTED]>: > > Hi Fellow AM'ers; > > I am restoring / modifying a Gonset G50 six meter transceiver. I have the > schematic, and documentation from the Bama ftp sight. The schematic there is > of poor quality, and reading component values is next to impossible. Does > anyone have a quality print of this schematic? A good print scanned would do > as would a 11 X 17 paper copy. > > I got the transmitter going pretty decent. The stock modulation really > stinks, so instead of fixing it Gonset made it a selling feature. With only > minor changes it is now approaching "decent". > > I am having problems with the receiver, and the squelch circuit. This is > where I really need a readable schematic. > > Anybody out there with G50 on the air experience? > > Regards, > Jim candela > WD5JKO > > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio > > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio >
Re: [AMRadio] Schematic Needed
Hello Jim: I cant scan a schematic for you but can copy mine and send it via post. Let me know if you have not received one yet. My modulation on the G-50 has been described as "excellent" using a D-104 microphone. The ones I have heard sound good too, but not many lows. The receiver sensitivity in mine is worse than I think it should be, even for its time. I think it was around 6 uV for only 6 dB S+N/N ratio. Have not worked on it lately. My dial drive slips also but hate to tear out the reduction drive (lazy). Good Luck es 73 DE Charlie, K0NG. Quoting Jim candela <[EMAIL PROTECTED]>: > > Hi Fellow AM'ers; > > I am restoring / modifying a Gonset G50 six meter transceiver. I have the > schematic, and documentation from the Bama ftp sight. The schematic there is > of poor quality, and reading component values is next to impossible. Does > anyone have a quality print of this schematic? A good print scanned would do > as would a 11 X 17 paper copy. > > I got the transmitter going pretty decent. The stock modulation really > stinks, so instead of fixing it Gonset made it a selling feature. With only > minor changes it is now approaching "decent". > > I am having problems with the receiver, and the squelch circuit. This is > where I really need a readable schematic. > > Anybody out there with G50 on the air experience? > > Regards, > Jim candela > WD5JKO > > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio > > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio >
Re: [AMRadio] plate transformer ID question
52CO46 that is the Stancor part # for the plate transformer for the BC-610E. The voltage figures are for the DC output voltage under full load, using a full wave ct rectifier circuit with choke input filter. The voltage selection is accomplished by selecting the appropriate tap on the 110v primary. I use one of these transformers for the modulator plate supply in my HF-300 transmitter. I originally had a pre WWII UTC plate transformer, but the insulation broke down and it bit the dust. The BC-610 unit made a nearly exact replacement. Don K4KYV _ The new MSN 8: smart spam protection and 2 months FREE* http://join.msn.com/?page=features/junkmail
[AMRadio] Schematic Needed
Hi Fellow AM'ers; I am restoring / modifying a Gonset G50 six meter transceiver. I have the schematic, and documentation from the Bama ftp sight. The schematic there is of poor quality, and reading component values is next to impossible. Does anyone have a quality print of this schematic? A good print scanned would do as would a 11 X 17 paper copy. I got the transmitter going pretty decent. The stock modulation really stinks, so instead of fixing it Gonset made it a selling feature. With only minor changes it is now approaching "decent". I am having problems with the receiver, and the squelch circuit. This is where I really need a readable schematic. Anybody out there with G50 on the air experience? Regards, Jim candela WD5JKO ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio
RE: [AMRadio] plate transformer ID question
Sounds like a BC-610 Plate XFMR to me as well. Choke input filtering and a pair of 866s or 3B28s and you got 2000 or 2500 VDC under load, depending on the primary selection. I was just looking at one this morning. It was lying on the floor of the shack because I'm too lazy to move it to a more permanent storage location. They don't consume all of the space in the bottom of a standard 19" rack cabinet but they don't leave a lot of room for anything else. I always bolt them to the bottom, so the 6 ft. cabinet won't tip over when you pull out the drawers of the other equipment up top. The chassis above is where the 866s go, in front of a viewing window with filament XFMRs, chokes, and oil filled caps behind. John, WA5BXO ---Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mike Dorworth K4XM Sent: Sunday, June 29, 2003 2:34 PM To: amradio@mailman.qth.net Subject: Re: [AMRadio] plate transformer ID question Sure don't know, sounds a lot like the plate transformer from a BC-610 except it would be for 2000 and 2500 volts DC not AC center tapped as you indicate. The size and weight are correct for the BC 610 however. Power wise this is your everyday 2000 watt all day unit or better. That's as wild as I can go! 73, Mike K4XM - Original Message - From: "Patrick Jankowiak" <[EMAIL PROTECTED]> To: Sent: Sunday, June 29, 2003 5:08 PM Subject: [AMRadio] plate transformer ID question > List, > > Here is a transformer identification challenge.. > > I have a decent size plate transformer I'd like to identify. Maybe > someone can tell me what big iron it is from. I was told it was from > an old AM transmitter of the 1940's. (unknown tubes, power, etc). I am > trying to determine the power rating. > > input: for nominal 110VAC 60 Hz. > output: 2000 or 2500VCT. > > secondary resistance is 125 ohms. > > The input is on one end of the transformer and has three studs with > nuts, one being common and your choice of the remaining two > determining the output voltage. > > The output is on the other end of the transformer and has three > ceramic insulators, of which one is the center tap. It looks like from > the leads that remain, to have been a full wave center tap scheme. > > The core is unremarkable, but the end bells are thick black iron > castings and have phenolic board in them, to mount the studs and > insulators. If the phenolic boards are unscrewed to peek inside, the > unit is found to be potted with black pitch or tar. > > The end bell for the input has the number (drum roll.) "52C046" > printed on it. > > The unit weighs 120 lbs and is about 12x11' square overall and 11" > tall. > > Please speculate wildly.. > SGT PJ > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio > --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.491 / Virus Database: 290 - Release Date: 6/18/03 ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio
Re: [AMRadio] plate transformer ID question
Sure don't know, sounds a lot like the plate transformer from a BC-610 except it would be for 2000 and 2500 volts DC not AC center tapped as you indicate. The size and weight are correct for the BC 610 however. Power wise this is your everyday 2000 watt all day unit or better. That's as wild as I can go! 73, Mike K4XM - Original Message - From: "Patrick Jankowiak" <[EMAIL PROTECTED]> To: Sent: Sunday, June 29, 2003 5:08 PM Subject: [AMRadio] plate transformer ID question > List, > > Here is a transformer identification challenge.. > > I have a decent size plate transformer I'd like to identify. Maybe > someone can tell me what big iron it is from. I was told it was from > an old AM transmitter of the 1940's. (unknown tubes, power, etc). I am > trying to determine the power rating. > > input: for nominal 110VAC 60 Hz. > output: 2000 or 2500VCT. > > secondary resistance is 125 ohms. > > The input is on one end of the transformer and has three studs with > nuts, one being common and your choice of the remaining two > determining the output voltage. > > The output is on the other end of the transformer and has three > ceramic insulators, of which one is the center tap. It looks like from > the leads that remain, to have been a full wave center tap scheme. > > The core is unremarkable, but the end bells are thick black iron > castings and have phenolic board in them, to mount the studs and > insulators. If the phenolic boards are unscrewed to peek inside, the > unit is found to be potted with black pitch or tar. > > The end bell for the input has the number (drum roll.) "52C046" > printed on it. > > The unit weighs 120 lbs and is about 12x11' square overall and 11" > tall. > > Please speculate wildly.. > SGT PJ > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio > --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.491 / Virus Database: 290 - Release Date: 6/18/03
[AMRadio] plate transformer ID question
List, Here is a transformer identification challenge.. I have a decent size plate transformer I'd like to identify. Maybe someone can tell me what big iron it is from. I was told it was from an old AM transmitter of the 1940's. (unknown tubes, power, etc). I am trying to determine the power rating. input: for nominal 110VAC 60 Hz. output: 2000 or 2500VCT. secondary resistance is 125 ohms. The input is on one end of the transformer and has three studs with nuts, one being common and your choice of the remaining two determining the output voltage. The output is on the other end of the transformer and has three ceramic insulators, of which one is the center tap. It looks like from the leads that remain, to have been a full wave center tap scheme. The core is unremarkable, but the end bells are thick black iron castings and have phenolic board in them, to mount the studs and insulators. If the phenolic boards are unscrewed to peek inside, the unit is found to be potted with black pitch or tar. The end bell for the input has the number (drum roll.) "52C046" printed on it. The unit weighs 120 lbs and is about 12x11' square overall and 11" tall. Please speculate wildly.. SGT PJ
