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

[Bob Camp]

Hi

And for major fun, you can get into altitude and humidity corrections on the exact number.
Since your altitude does not change day to day, humidity is often the thing that drives you
a bit nuts. 

Bob

> On Aug 19, 2015, at 1:30 AM, Bruce Griffiths <bruce.griffiths at xtra.co.nz> wrote:
> 
> 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.
> Bruce
> 
> 
> 
>     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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