[Milsurplus] Question on distorting coax shape

[mac]

John,

Can't point you to the chart or publication you requested but the  
critical factor here would be the frequency/wavelength of the energy  
being passed through the coax vs. the dimensions of the distorted  
section.  For those cases where the distortion (i.e., kink, squeeze,  
etc. negating a short circuit of course) is a very, very small  
fraction of a wavelength, say  2 - 3 inches  at HF, the effect would  
be negligible.  By the same token a small dent in a waveguide  
operating up in gHZ range could be a big problem.

Dennis D.  W7QHO
Glendale, CA

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On Dec 19, 2012, at 3:58 PM, John Hensley wrote:

>
>
>
>
> I'm looking for some test data, preferably a chart or two, which  
> might show how the technical specifications of coax (impedance,  
> frequency efficiency, et al) are affected when the coax shape is  
> deformed, e.g. as the coax cross sectional shape is distorted or  
> changed.
> For example, imagine a worker dropping coax down from a tower and,  
> using a tie wrap gun, over tightens the tie wrap so that the coax is  
> squeezed out of shape.  Or, imagine the coax is flattened at a point  
> because of some other event.
> QSO via private or list email is okay.
> Thanks,
> John W5JV
> 		 	   		
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