[time-nuts] Vectron GPSDO Oscillator stranges...
Ed Breya
eb at telight.com
Thu Jan 10 18:48:38 UTC 2013
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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