This might be slightly off-topic, but probably there is a time-nut who
knows the answer.
I am trying to adjust the 10 MHz OCXO in a Cushman 5110 service
monitor. I am using a frequency counter driven by a GPSDO. Perhaps
someone can educate me about a couple problems I am encountering.
I tried making small incremental adjustments but after I am done, the
frequency drifts several Hz and then re-stabilizes at a new value. When
I make further adjustments, I notice strange behavior. For example, if I
initially turned the adjustment clockwise to increase the frequency, it
will now decrease if I turn it clockwise and increase if I turn it
counter-clockwise. On the next adjustment, it will reverse again.
Is there some correct procedure to adjust an OCXO?
Many thanks for any suggestions.
Fred Bray
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