I've encountered a new issue with my TR-7. On 20 meters only, as I turn the
PTO and reach 14.250, the vco seems to unlock as the DR-7 display stops
increasing in frequency and reverses or drifts down 20 or 30 kHz. Below 14.250
all works normally. I pulled the vco board and reseated it and thought I had
it, until the radio warmed up 10 minutes and then the same thing happened. I
had the radio parked on 14.350 and it started to drift again after a short warm
up period. Could be a soft bit in a counter perhaps due to one of the ECL
chips. I have had trouble with these in the past. Any suggestions would be
helpful; PS where exactly is the test point on the vco board?
Thanks,
Mike W4DL
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