[time-nuts] Cavity frequency air filled vs vacuum?

Alex Pummer alex at pcscons.com
Wed Aug 19 09:22:33 EDT 2015

vacuum's dielectric constant is 1, air dielectric constant  is 1.00059 
at 1 atm, therefore the frequency with vacuum is higher, but with air it 
depend on pressure and humidity also
On 8/18/2015 9:49 PM, cdelect at juno.com wrote:
> Hi everyone!
> I'm trying to figure out what change if any to a cavities resonant
> frequency would be when measured with ambient air pressure and then with
> a vacuum inside. There will not be any pressure on the cavity when under
> vacuum as the outside of the cavity will also be at vacuum. The cavity
> frequency under vacuum will be 1420Mhz + (Maser frequency).
> Thanks,  Corby
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