[time-nuts] FTS 1200

John Miles jmiles at pop.net
Fri Aug 10 01:12:34 UTC 2012

> John
> Oven did reduce in current and I can not imagine that it would be that
> close with an overheated oven. At 0 V it is within .5 Hz of what they
> are. Ground has no effect but even 0.8 V on pin 2 stops oscillation

That's a suspicious-sounding voltage.  Are you sure you're not
forward-biasing the varicap?  Maybe some of these OCXOs were specified for
use with negative EFC voltage. 

If so, then driving the diode with a negative voltage should raise the
operating frequency (which is what you want.)

-- john, KE5FX

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