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

Bruce Griffiths bruce.griffiths at xtra.co.nz
Wed Aug 19 01:30:04 EDT 2015

The ratio of the resonant frequency of the evacuated cavity to that of the air filled cavity increases by the square root of the relative permittivity of the ambient air or around 300ppm or so.

     On Wednesday, 19 August 2015 5:06 PM, "cdelect at juno.com" <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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