Re: [time-nuts] Vectron GPSDO Oscillator stranges...

[Ed Breya]

Can you completely swap the Vectron crystal oscillator modules between 
the Datum units? Maybe the fault lies in the other part. If they are 
GPSDOs, each must have a DAC somewhere driving the tuning control line 
to the VCXO, The 10 kHz may be the DAC serial data rate, or a PWM rate 
for fine tuning. A fault in that area could cause the sidebands. Maybe 
you really did hear "data." If you can hang a fairly large (several uF 
or more) plastic capacitor on the tuning line without causing the whole 
thing to oscillate, you may be able to observe a decrease in the 
sideband amplitude - a sure indicator that the tuning signal carries the 
problem.

Ed
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