On 6/12/22 6:30 PM, Bob kb8tq via time-nuts wrote:
Hi
Tear into some of your SC cut based OCXO’s. Take a look at the crystal package.
For
bonus points, open up the crystal package. If you have the gear to test it,
take a look
at what the gas *is* inside the package. ( Good luck with that :) :) :) )
If you had the gear and the willingness to scrap out OCXO’s you would find that
a number
of fast warmup OCXO’s have a *tiny* amount of He in the package. Measuring this
would
be tough ( it’s that small). Go through the thermal modeling and it’s *way*
more conductive
(thermal wise) than a *perfect* vacuum ……
Bob
And the worst thing is that if your vacuum sealed widget is in an
atmosphere with more He around (like waiting for a launch, in a place
that does more He leak tests, etc.), the He will diffuse into your
package and it doesn't work like expected.
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