[time-nuts] FTS 1200

EWKehren at aol.com EWKehren at aol.com
Thu Aug 9 21:22:06 EDT 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



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