[time-nuts] 8663 Oscillator Tuning

Bob kb8tq kb8tq at n1k.org
Tue Jun 25 13:50:57 UTC 2019


Hi

If you want to use the OCXO stand alone, you can tune it closer. If it’s part of a GPSDO, your
only alternative is to rewrite the firmware in the unit. 1x10^-12 is about as good as it gets frequency
wise on a GPSDO so there isn’t a lot of “hope” if you do dive into the code.  

Bob

> On Jun 25, 2019, at 6:12 AM, Chris Burford <cburford1 at austin.rr.com> wrote:
> 
> I have an Oscilloquartz 8663-XS DOCXO in a generic eBay GPSDO. I would like to fine tune the output to get it a little closer to MHz.
> 
> At current it appears to be running at 9.93x10^-13 at t1000. I'm clocking it against a PRS10C RFS using a TICC and TimeLab. Specifically I'm looking for the procedure or what is involved in tuning the output frequency of my GPSDO.
> 
> I have at my disposal an oscilloscope, DMM, frequency counter and various other bench hardware. I'd be curious to hear how this is done whether it is specific to this oscillator type or not.
> 
> Any assistance is certainly appreciated.
> 
> Chris
> 
> 
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