I've lost track now of who it was, but someone asked if there was a
better strategy than a GPS disciplined quartz oscillator or a GPS
disciplined rubidium. My best standard uses an SRS PRS10 rubidium
disciplined by GPS PPS at tau = VERY long (> ~12 hours), using the
PRS10's internal PPS locking. The rubidium, in turn, disciplines my
best OCXO at tau >300 seconds. So, for tau less than ~300 seconds
the stability is determined by the OCXO; for tau greater than ~300
seconds and less than ~12 hours, the stability is determined by the
rubidium; and for tau > ~12 hours, the stability is determined by
GPS. I have found that this works very well.
Note that the PRS10's digital PPS PLL has a bewildering array of
adjustable parameters. One can easily get lost exploring different
combinations. My advice is to keep it as simple as possible.
Best regards,
Charles
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