[Elecraft] [K1] VFO Drift Problem

[Matt Scholz]

Hi -

I am trying to reduce my K1's VFO drift to an acceptable level. The VFO
frequency drifts up at a rate of about 30Hz/minute (after a 5 minute warm
up). Even after one hour, the drift is still about 15Hz/minute. This is
too much, obviously.

I have been trouble shooting this with the help of Gary, AB7MY. So far I
have done the following:

* Removed C2 to isolate D3 from the rest of the VFO circuit. No change.
* Replaced all three VFO poly caps (one at a time). See above.

I was wondering if anybody had any ideas on how to further trouble-shoot
and resolve this issue...

Thanks in advance and 73,

-Matt / W6ZBA

K1 #2978