If its drifting "up and down", I would suspect the PTO mechanism. It
might need rebuilding or relubrication. If drift is in one direction,
it is warmup drift. Each Corsair PTO was individually temperature
compensated at the factory but some are better than others. Under the
bottom PTO cover, on the foil side of the PTO board, there is a small
ceramic capacitor. It is an "N750" type (negative temperature
coefficient of 750 parts per million per degree). The value may be
around 5 or 10 pf. Try different velues of N750 caps. After changing
caps the PTO alignment will have to be adjusted slightly.
73,
Bob WB2VUF
Carl Hyde wrote:
>
> Well last night I conducted the first real QSO I have made with my newly
> acquired Corsair I. about ten minutes into the conversation I noticed that the
> frequency was drifting up and down by 200 to 800 Hz. The other party also
> stated my signal was drifting on transmit. I have the external VFO installed
> but I made sure it was not on and the main radio was TX/RX and AB listen was
> off. Anyone else experience this? Is it common or is it time for a trip to
> Tennessee? Thanks
>
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