From: "Mike Williams" 
Subject: [drakelist] TR7 frequency hopping solved


"Mike Williams"  made an utterence to
the drakelist gang
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Thanks for all the replies to the problem I had with a TR7 jumping 50 or =
100 cycles while listening to the calibrator or a cw signal.  I went =
through the usual pulling and cleaning of the VCO, and the pass band =
tuning  card since these two handle the oscillators for the radio.  I =
cleaned the PTO thoroughly as well.  The problem persisted and finally I =
noticed a blip on the receive 10 volt bus;  pulled the power supply =
board and cleaned all contacts, readjusted the 10 volt supply and we're =
back in business. The minor change in the 10 volt rail was shifting the =
VCO, VCXO or the BFO, hence the frequency shift.

Thanks again,

Mike W4DL
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Thanks for all the replies to the problem I had =
with a TR7=20
jumping 50 or 100 cycles while listening to the calibrator or a cw =
signal. =20
I went through the usual pulling and cleaning of the VCO, and the pass =
band=20
tuning  card since these two handle the oscillators for the =
radio.  I=20
cleaned the PTO thoroughly as well.  The problem persisted and =
finally I=20
noticed a blip on the receive 10 volt bus;  pulled the power supply =
board=20
and cleaned all contacts, readjusted the 10 volt supply and we're back =
in=20
business. The minor change in the 10 volt rail was shifting the =
VCO, VCXO=20
or the BFO, hence the frequency shift.
 
Thanks again,
 
Mike
W4DL

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