[time-nuts] OCXO pressure sensitivity before TCXO

[Bob kb8tq]

Hi

You can run a controlled experiment where you simply change the pressure. Crystals
are indeed pressure sensitive. It’s one of the reasons welded packages became more
popular for OCXO’s ( welded crystal package inside a welded OCXO package means
less pressure change onto the crystal package).

The source of the problem is flexing of the crystal package as pressure changes. That
translates (even with an SC) into a frequency change. 

Bob

> On Aug 3, 2019, at 12:56 PM, Richard (Rick) Karlquist <richard at karlquist.com> wrote:
> 
> How do we know the change is not due to humidity that happens to track pressure?
> 
> Rick
> 
> On 8/3/2019 7:22 AM, ew via time-nuts wrote:
>> Are wee missing something. Reading Bill Slade post and old NASA attachments the attached plot to me was an eye opener. Our work has always been focused on Rb pressure compensation. Are we overlooking something. Has any one done some work on this subject
>> Thanks    Bert Kehren
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