[time-nuts] FTS 1200
EWKehren at aol.com
EWKehren at aol.com
Fri Aug 10 01:22:06 UTC 2012
John,
that did the trick I can tune it with a negative voltage, minus 13 gives
me plus 2 Hz but this unit came out of a FTS 5000 and it had a positive
tuning voltage.
Bert
In a message dated 8/9/2012 9:13:29 P.M. Eastern Daylight Time,
jmiles at pop.net writes:
> 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
normally
> 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
www.miles.io
_______________________________________________
time-nuts mailing list -- time-nuts at febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
More information about the time-nuts
mailing list