Re: KX-1 antenna matching

Posted by stan levandowski on Jun 10, 2017; 12:59am
URL: http://elecraft.85.s1.nabble.com/KX-1-antenna-matching-tp7631522p7631529.html

Thank you to all who offered suggestions, all of which helped me solve
this nagging problem.


I bought a 33' tape measure from Harbor Freight.  I scrapped off the
paint at the end, drilled a 3/16" hole and put a bolt, a couple of
washers and a two nuts on it.  Then I cut a 5' piece of wire and
attached one end to the tape measure and the other end to the black BNC
terminal on the KX1.


I did not fiddle around with the 25 foot radiator.


I laid the tape measure right on the grass.


By adjusting the tape measure - now I knew exactly how much counterpoise
was being deployed and it was infinitely adjustable - I was able to get
1:1 SWRs on 40, 30 and 20 meters.


I found that 31 feet on the tape measure + the 5 foot connecting wire
worked best as a single compromise counterpoise length for all three
bands -- with this 36 foot length I got 1:1 on 40M, 1.3 on 30M and 1.2
on 20M.


73, Stan WB2LQF







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