[TowerTalk] Coax Losses on 160 and 75?

[Steve Hunt]

With a short circuit termination, the line needs to be an even number of 
quarter-waves long; with an open termination the line needs to be an odd 
number of quarter-waves long.

For the short-circuit termination case, measure the input resistance Rin 
at a frequency where the line is an even number of quarter-waves long; 
then a close approximation to the loss is:

Loss (dB) = 8.69 x Rin / Zo

Take a look at measurements made using that method compared to 
predictions in the final chart here:
http://www.karinya.net/g3txq/wet_ll/

Steve G3TXQ

On 12/08/2016 19:53, TexasRF--- via TowerTalk wrote:
> And the results are intuitively obvious for even the most casual observer,
> right?
>   
> The pdf mentions 1/4 and 1/8 wavelength multiples. Can we take it that
> random lengths do not work for the concept?
>   
> 73,
> Gerald K5GW
>   
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>   
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