On Tue, 18 Aug 2015 21:49:50 -0700
cdel...@juno.com wrote:
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
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.griffi...@xtra.co.nz
wrote:
The
On Tue, 18 Aug 2015 21:49:50 -0700
cdel...@juno.com wrote:
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
On 8/18/15 10:30 PM, Bruce Griffiths 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
I believe that there are systems that measure
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
73
KJ6UHN
Alex
On 8/18/2015 9:49 PM, cdel...@juno.com wrote:
Hi everyone!
I'm trying to figure out what change
kb...@n1k.org said:
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.
Is it altitude or air pressure (density)?
There is a semi-joke about good
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, cdel...@juno.com
cdel...@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
