[time-nuts] Quartz oscillator slow drift/aging

[Bob kb8tq]

Hi

That’s unexpected on an OCXO that may have been power off for a 
decade or more. Let it run for a month and see how it’s doing then.

Bob

> On Dec 2, 2019, at 2:30 PM, AC0XU (Jim) <James.Schatzman at ac0xu.com> wrote:
> 
> Time Gurus-
> 
> I have a FPS 1150A quartz oscillator with the 1 PPS disciplining option. With the frequency control set to "manual" I can use the digital thumbwheel control to set 10 MHz correctly. However, for two weeks there has been a steady drift upwards of about 2E-10 per day. I have not seen this behavior in other similar oscillators - the magnitude of the drift seems greater than expected. Any ideas what could be happening?  I have no idea how long the unit was unpowered before I got it - it needed repairs - it may have been years. Is this normal? Should I  expect the drift to decrease over time? Etc?
> 
> Thanks!
> 
> Jim
> 
> 
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