Topband: electrical wavelength

[Wes Attaway (N5WA)]

Tom .... I think everything is real quiet while a bunch of folks are busy
looking at manuals and crunching numbers with their analyzers.  Someone
wants to find a mistake in your opinion.

Stand by.


----------------- Wes Attaway (N5WA) ------------------- 
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-----Original Message-----
From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Tom W8JI
Sent: Monday, September 10, 2012 8:29 PM
To: topband at contesting.com
Subject: Re: Topband: electrical wavelength

> Run the numbers and for RG-6 we see that sq root of L/C is good above a
> couple hundred kHz.
>
> Dave WX7G

I just ran it in MathCAD and it showed a Zo and Vf slope starting down 
around 150 kHz, but I assumed the conductors were solid copper. Conductors 
have to be in the thousands of a inch range thick to cause an HF slope, 
because skin depth is .00256 inches on 1 MHz for copper.

I cannot understand the HF and higher numbers at all, where it is all pretty

much set by the dielectric constant slowing the TEM wave.

I don't even think it would be a practical concern down to 100 kHz or so 
where copper skin depth is .0081 inches and we might be getting into the 
steel core, or am I missing something here?  :-)

73 Tom


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UR RST IS ... ... ..9 QSB QSB - hw? BK