How much coax did you add? The main idea of open wire line is it is
much less lossy than coax at high SWR's. You therefore want to keep the
coax portion is short as practical. The SWR on the feedline could be
100 to 1 or even higher.
Carl Moreschi N4PY
58 Hogwood Rd
Louisburg, NC 27549
www.n4py.com
On 11/9/2013 3:48 PM, Robert Mcgraw wrote:
That's good news.
The length of coax is some portion of an electrical wavelength. It
simply adds some value of reactance which then the tuner is able to
match.
Just for curiosity, have you tried to measure either the Z or the SWR
between the tuner and the LMR400. I bet the SWR is real high. But not
to worry, the LMR400 has low loss even with high SWR.
73
Bob, K4TAX
Bob, and the gang,
I added a random length of LMR400 coax between the output of the coupler
and the 1:1 balun.
I’am guessing I’m tuning the coax and not so much coupling energy into
the doublet. But now, the palstar and the Ten Tec 238 can find a tuning
solution at 1.8000 mhz. Without the extra length coax length, neither one
would. I have not tried other frequencies yet on either coupler.
Remember, I changed the length of the coax from the back of the tuner to
the 1: 1 balun. NOT the length of the 600 ohm feed line
mike, WB8VGE
Mike Bryce
prosolar@sssnet.com
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