"Hubert ROTH" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Hello I am putting on the air a Drake Cline. R-4C sn 25508 has following
problems. While tuned on a frequency frequency is juming a few hertz
erraticaly. Hardly noticable on SSB but awfull in CW.
I cleaned mechanism tryed to ground the yoke and ended up with a completely
dismantled PTO lying on y bench and still jittering. Power up by a lab
supply.
I changed the resistors the FET the buffer and several NP0 caps. Only if I
replace the Zener diode by a 7.5V it gets stable. I monitor on a receiver
tuned lets say on 5000Khz and with a hp8568 spectrum analyzer.
With the 7.5V zener output is not enough for driving the mixer so I put a
little amp at the output but I still low and 2 S points down against the T4X
PTO
So do you have any ideas or a spare PTO :)
Best 73,s Hubert F6DUK
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