Re: [Drakelist] Drakelist Digest, SPOT FUNCTION TUNE UP
In a message dated 1/2/2012 10:41:28 A.M. Eastern Standard Time, drakelist-requ...@zerobeat.net writes: http://www.mail-archive.com/drakelist@zerobeat.net/msg01540.html Ron: That is exactly how I tune up my B line with the spot function and peak the plate and preselector I have been doing it that way for a few years and that is why I noticed the spot not working any longer. Still no out put other than idle current when in tune position or when PTT is pressed now Maybe a blown Diode or cap in Power supply??What do you think? 73 de Fred WD8ADG ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Drakelist Digest, SPOT FUNCTION TUNE UP
If you're still able to receive using the transmitter to control, then your supply is probably okay, since the low-level tubes use the same +250V supply (other than PA plate and bias). If you're still getting 70mA of idle current, that would make it likely that your PA plate and bias supplies are also okay. Loss of any of the low-level part of the chain will give you no output. Check all the oscillators for signal presence. 73, Steve Wedge, W1ES/4 Live free or die: Death is not the worst of evils. John Stark. All my computers have my signature with various pearls of wisdom appended thereto. From: fjmel...@aol.com Sent: Monday, January 02, 2012 10:57 AM To: drakelist@zerobeat.net Subject: Re: [Drakelist] Drakelist Digest, SPOT FUNCTION TUNE UP In a message dated 1/2/2012 10:41:28 A.M. Eastern Standard Time, drakelist-requ...@zerobeat.net writes: http://www.mail-archive.com/drakelist@zerobeat.net/msg01540.html Ron: That is exactly how I tune up my B line with the spot function and peak the plate and preselector I have been doing it that way for a few years and that is why I noticed the spot not working any longer. Still no out put other than idle current when in tune position or when PTT is pressed now Maybe a blown Diode or cap in Power supply??What do you think? 73 de Fred WD8ADG ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Drakelist Digest, SPOT FUNCTION TUNE UP
Fixed the R-4B problems: found a 200-ohm pot by the same manufacturer, but it didn't have the mounting tabs, so I disassembled the old one and the new one and transplanted the mount onto the new pot. 200 ohms seems to offer enough adjustment range for the S-meter. I then found that most of my problems were from [a] the reattached 150-ohm cathode resistor to V1 was shorting to the shielding around the bandswitch, and [b] the coax from the PTO filter board to V8 was shorted due to the centre conductor getting melted and touching the braid. Both wounds were self-inflicted. The rig is working on all bands now, but the PTO is mechanically unstable. If push comes to shove, I'll swap in the extra PTO I have, but I'm going to set the shaft tension as soon as I'm done with my email... Steve Wedge, W1ES/4 Live free or die: Death is not the worst of evils. John Stark. All my computers have my signature with various pearls of wisdom appended thereto. From: fjmel...@aol.com Sent: Monday, January 02, 2012 2:37 PM To: w1es1...@earthlink.net Subject: Re: [Drakelist] Drakelist Digest, SPOT FUNCTION TUNE UP John: I hope you find the trouble with your B line too. Good luck and don't let it push you over the edge. You words of wisdom are interesting. 73 de Fred WD8ADG___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Drakelist Digest,Spot function
Anyone know where to look to correct the spot function. My Drake B Line transmitter spot function position works some time and at other times nothing. Sometime a gentle slap will bring it back to life but I don't like to do that. Any ideas? Also Crystal calibrator not working at all. If it is the crystal where is it located? Thanks 73 de Fred WD8ADG ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Drakelist Digest,Spot function
Fred - Both sound like switching problems. DeoxIT (or your preferred potion) on the various switch contacts will almost certainly take care of the spot situation. If not, you may need to clean the relay contacts as well. More DeoxIT on a piece of good paper pulled through the contacts with pressure applied. The Calibrator could well be the low voltage supply. There is a diode / electrolytic off of the filament supply that is used to power the dividers used in the Calibrator, and you may need a new cap. The 100 kHz oscillator is driven off the same supply as the PTO and BAND oscillators, so you would still have 100 kHz points, possibly having to bring the receiver antenna lead close to the oscillator. The Calibrator is located at the rear center of the chassis, and has the large crystal can that is clipped to the chassis in a spring mount. NOT the crystal with the paint stripe on it! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com fjmel...@aol.com wrote: /Anyone know where to look to correct the spot function. My Drake B Line transmitter spot function position works some time and at other times nothing. Sometime a gentle slap will bring it back to life but I don't like to do that. Any ideas? / // /Also Crystal calibrator not working at all. If it is the crystal where is it located? / // /Thanks / // /73 de Fred WD8ADG / ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
