Hi,
given it is a 10MHz OCXO, your drift is just 4E-11/hour or 9.6E-10/day,
which isn't terribly bad, is it?
A good modern OCXO is specified at +/- 0.2ppb/day (2E-10) after 30 days
of continuous operation. Some ultra high performance stuff does
<1E-10/day, and may improve down into the E-11's after years of
undisturbed operation.
Keep in mind that your GPS reference frequency may vary by up to about
+/- 5E-11 during the day.
And, your OCXO is sensitive to temperature, power supply and air
pressure changes.
Regards,
Adrian
Am 04.09.2020 um 08:50 schrieb Matthias Welwarsky:
Hi,
I mentioned in a previous email that I seem to have picked a particularly bad
(broken?) OCXO for GPSDO testing. It drifts at a very high rate, from the DAC
graph I calculate it is around -4e-4 Hz/hour. It's been on for about 1 week
now and the drift doesn't seem to come down, or maybe just marginally.
Of course, this being a surplus OCXO with unknown history, odd startup
behavior is somewhat expected but so far I haven't seen anything this drastic.
Could this be OCXO retrace? How long can that phase last? I'm trying to decide
if I should give it another week or just scrap it and move on.
Regards,
Matthias
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