[time-nuts] OCXO retrace, how long is reasonable?

[Bob kb8tq]

Hi

Best guess is that the oven circuit has “issues”.  If that’s the case, it will
go on pretty much forever and ever. Without a plot, it’s sort of hard to 
guess ….

Bob

> On Sep 4, 2020, at 2:50 AM, Matthias Welwarsky <time-nuts at welwarsky.de> wrote:
> 
> 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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