[time-nuts] Ovenaire OCXOs

Magnus Danielson magnus at rubidium.dyndns.org
Tue Apr 12 20:48:09 UTC 2011


On 04/12/2011 10:05 PM, WB6BNQ wrote:
> Hi Joe,
>
> You should have left the frequency adjustment alone for at least 30 days and more
> like 90 days.  On a high quality oscillator it takes at least 30 days minimum for
> the package to stabilize.  Otherwise you will just be chasing all the mechanical
> stresses, including the crystal itself, that take that long to settle out.
> Changing the adjustment causes additional stresses that need time to settle.  It
> does not have to be "spot on" frequency to determine the drift and the Adev.
> Unless the thing is so far off as to be outside the range of your measurement
> process, it would have been better to leave it alone.

It soo depends on the quality. For lesser OCXOs the daily shifts have 
the frequency walk around sufficiently anyway. Still, you want the 
oscillator run for quite some time for the normal termal related drift 
(many sources) to settle down.

Cheers,
Magnus



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