[time-nuts] Lady Heather Makes a Discovery

Peter Putnam ni6e at sbcglobal.net
Thu Dec 28 01:37:21 EST 2017


Greetings,

I've been tuning up a new Trimble/Nortel NTGS50AA GPSDO and discovered 
an interesting phenomenon:

Barometric pressure has a larger effect on the device than day-to-day 
temperature variations.

In the attached plot, DAC scaling is 500 uV and TEMP scaling is 5000 
milli-degC per division. A plot of local barometric pressure, stretched 
to match the time frame, was photoshopped over the Lady Heather display. 
The OXCO is marked 34310-T2.

A Trimble/Nortel NTBW50AA (with oscillator "O") running nearby doesn't 
show any significant sensitivity to temperature or pressure.

Regards,
Peter



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