I was doing a set of measurements and realized I'd come up with
everything you need to understand about GPSDO in one ADEV plot. :-) I
thought I'd pass it along.
This shows a sawtooth-corrected GPS PPS and two GPSDOs -- one quite good
(Z3805), and the other quite awful (u-Blox M8F VCTCXO).
You can see that the quality of the crystal oscillator determines what
the control loop time constant should be -- the better the oscillator,
the longer the time constant. As different as their performance is,
both these units have their constants pretty well chosen.
John
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