Re: [Drakelist] R4B T4XB Tuning up
I use the spot position on the Transmitter and tune for max on the receiver s meter. Preselectors first and main tuning knob on Transmitter second. Plate next and load control at 3.5 for 80 meters and 4.5 on 40 meters and higher freq. I noticed that I get an additional 20 to 30 watts output when I check the watt meter if I tweek the preselector on the receiver again. Is this normal? If so why? Thanks Fred WD8ADG ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] R4B T4XB Tuning up
Fred - This only occurs when transceiving with receiver control, and is a result of the loading of the cable used for the INJ connection. The lower the capacitance of this cable, the less variation in peaking the Preselector. The effect can also be minimized by doing the INJ alignment with the pair coupled together with the cable you plan to use for INJ. ALWAYS be sure and dip the Final PLATE control LAST. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com fjmel...@aol.com wrote: I use the spot position on the Transmitter and tune for max on the receiver s meter. Preselectors first and main tuning knob on Transmitter second. Plate next and load control at 3.5 for 80 meters and 4.5 on 40 meters and higher freq. I noticed that I get an additional 20 to 30 watts output when I check the watt meter if I tweek the preselector on the receiver again. Is this normal? If so why? Thanks Fred WD8ADG ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] L-7 amp soft start?
Anyone know where to find a soft start for the L-7? Jeff at Harbach told me his L-4B soft start does not work on the L-7, and his universal soft start does not work on either the L-7 or the L-4B. 73, Bill NZ5N ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] 2-C loud buzz
Perhaps the transformer screws are loose and when you turn it upside down the chassis no longer vibrates in sympathy with the transformer. Dennis AE6C On Wed, Apr 14, 2010 at 3:49 PM, Garey Barrell k4...@mindspring.com wrote: Probably a bad solder joint on the filter cap. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com Charles Ring wrote: My 2-C, which I bought new in 1968, suddenly developed a very loud buzz which is there, unchanging, no matter what position any controls are in. Suspecting the main filter cap, I took the bottom cover off and turned the receiver upside down, turned it on and the buzz was gone. I could not provoke it to come back. So I reassembled it and it worked fine for a few days, but now the loud buzz is back. I'd expect a bad electrolytic to stay bad. Is there a known cause for this behaviour? I have the manual with schematic. 73 de W3NU ___ 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] L-7 amp soft start?
On Thu, 15 Apr 2010 19:23:25 -0700 (PDT), Bill Dzurilla wrote: Anyone know where to find a soft start for the L-7? Jeff at Harbach told me his L-4B soft start does not work on the L-7 I don't know why not, the L-7 and the L-4B are, for most practical purposes, virtually identical. Is it a physical size issue? Soft start circuits aren't rocket science, there is plenty of info on the web to roll your own. You could even use series light bulbs with a manual bypass switch. Seems to me I looked at some pics on the Heathkit shop web site one time, and you could almost trace out the circuit from the pics. In the meantime, always power up with the amp in CW mode. That reduces the turn-on surge by a bit. 73 -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://radiojim.exofire.net http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
