Cecil --

I think your right, 1:1 should work fine, with 1/2 wavelength, low loss
line.

I was matching to a long line with charestic impedance of 450. But, I think
the length of the line must be long (or have loss) before the charestic
impedance of the line shows up to really matter. I used to have a program
that showed this effect. I installed a 450MHz 500 foot line in Saudi, and
measurements had to be careful, because we had a lot of line loss. (we were
heating up the Heliax, more than radiating power out the antenna)

But on a short run, lower frequency, there is not enough of the line to make
a large effect. (I think it has to be more than about 2-3 dB line loss...),
so the Tx output is seeing primarily the load(antenna). And then the 1/2
wavelength will causing a "null" at the Tx output. When I run across the
program/formula I post it. It is probably in the same book, same section,
too.
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"Cecil Moore" wrote in message
...
John Smith wrote:
Agreed that adding a 9:1 balun (impedance match) will have little
mismatch
loss at x and all the Tx power will be "presented" to the antenna port.

Oh Boy, I really screwed up. Replace that 9:1 balun with a 1:1 balun.
I was very stupid to have said 9:1. A 9:1 balun would reduce that 50
ohm Z0-match to 5.56 ohms thus creating a mismatch.
--
73, Cecil, W5DXP