[Elecraft] Another feedline question

Thu Dec 18 10:42:00 2003

It is the same. If 100' of matched 50 ohm coax has a loss of 1 dB, then =
100 feet of 100 ohm balanced line has 1 dB loss.

  Dave

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Parker Buckley
Sent: Wednesday, December 17, 2003 7:06 PM
To: [email protected]
Subject: [Elecraft] Another feedline question

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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