[time-nuts] OCXO pressure sensitivity before TCXO
jimlux
jimlux at earthlink.net
Mon Aug 5 22:31:06 UTC 2019
On 8/5/19 2:21 PM, Poul-Henning Kamp wrote:
> --------
> In message <d4c46442-c783-fde9-d8da-2b32cb11f201 at earthlink.net>, jimlux writes:
>
>> One other thing to know about those USOs - they start about 1000 quartz
>> blanks that are mounted in holders, and wind up with a couple dozen
>> oscillators in dewars, and then run them all for a long time (many
>> months) and watch them. 2 or 3 out of a batch will be the ones selected
>> for use - based on their observed stability -
>
> Do you know where their trash bin is located, and if it is locked ? :-)
>
> I would love to get my hands on a unit from, say, the 10-25 tier of that process.
>
I think they do get reused - the aging process is just the oscillator
without all the rest of the electronics. And there's always a need for
engineering models and qual units for environmental testing.
I'll bet that's why they developed the USO with a built in DDS - so that
one that turned out to be 22.12345 MHz can be "reprogrammed" for
10.000000 MHz
More information about the Time-nuts_lists.febo.com
mailing list