Try taking a big fat toroid from somewhere and looping your coax
through that about 15 times at the antenna end and see how that works
for you. Alternately, put a bunch of clip-on beads on the coax at the
antenna end and try that. Alternately, try lengthening the antenna on
the 'hot' side as the coax braid may be acting as the ground side. Not
saying I know, just saying, Try. 73 de Alex NS6Y.
On Apr 30, 2006, at 5:49 PM, Don Wilhelm wrote:
Paul,
A balun may or may not help. and in any case, a balun or no balun is
not the
answer to your situation - the 20 ft of coax is acting like an
impedance
transformer, and without a thorough analysis of your antenna and
feedline
system, it is difficult to say what would help. Perhaps some
experimentation is in order - add a 4:1 balun and see what happens,
simlarly
try a 1:1 balun, try changing the length of the parallel feedline, and
try
changing the length of the coax. All these things will influence the
results, as will changing the length of the antenna wires. If you do
not
have adequate instrumentation to analyze the system, then a bit of old
fashioned 'cut and try' may be the way to properly answer your
questions -
in any case, keep notes of what happens so you will know which way to
go
when making future changes. When you find something that works,
rejoice and
let us know, perhaps some of us can give you some info relating to why
it
works.
73,
Don W3FPR
-----Original Message-----
I have been playing with my KX1 in the back yard the last week or so
and
found that about 26ft of wire in the hot side of the bnc
connector and about
the same to the cold side gets me a good match with the built in ATU
on
40,30,20m
Now if I use the same wires but add 20ft of coax between the
radio and these
wires I find it very hard to get a match on any band, do I need to
use a
balun at the end of the coax?
Any thoughts
Paul
M0BMN
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