[time-nuts] Ovenaire OCXOs

[Joseph Gray]

Bill and Magnus,

Thanks for the tips. At this point I was mostly curious to see if the
oscillator worked and if it was reasonably stable. To let it cook for
a while, I will definitely have to put everything in a box. I am
getting a battery and putting the pieces together to run it off
battery or AC. I have a nice portable enclosure that has been on the
shelf for months. This would be a good use for it.

Later, I want to replace the OCXO with a Rubidium. In the mean time,
I'll have the OCXO to play with. When I get the Rubidium, I'll replace
the OCXO and have a much better portable standard. I just happened to
have the OCXO and the enclosure lying around, so I thought I'd start
there.

Joe Gray
W5JG

On Tue, Apr 12, 2011 at 2:48 PM, Magnus Danielson
<magnus at rubidium.dyndns.org> wrote:
> 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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