[time-nuts] Quartz oscillator slow drift/aging

[Bob kb8tq]

Hi

Yikes !!!!

That should read “expected on an OCXO” !!!

Sorry !!!

Bob

> On Dec 5, 2019, at 8:05 AM, Bob kb8tq <kb8tq at n1k.org> wrote:
> 
> 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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>