[Elecraft] Another feedline question

[Charles Greene]

Parker,

I had one of those, works pretty well.  I don't know for sure, but logic 
seem that it has the twice the loss as a single coax.

At 09:06 PM 12/17/2003, Parker Buckley wrote:
>I know this probably belongs on Antennex, but while you guys
>are all fired up over transmission lines, I'll ask my
>question.  When one makes parallel transmission line from
>two pieces of coax, say 50 ohm, shields connected, using the
>inner wire as the transmission line to get 100 ohm line,
>what is the theoretical loss of this line?  Is it twice the
>loss of a single piece of coax, half the loss, or something
>entirely different?  I've measured velocity factors of these
>lines and get exactly the same velocity factor for the pair
>that I do for a single piece of the same coax.  I have not
>attempted loss measurements, however.  Maybe loss is related
>to vf, and I've answered my own question and don't realize
>it.
>
>Parker WD8JOL  K2 #2636
>
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73, Chas,  W1CG
K2 462b, 3571