Don's comments on the fact that a J-pole is merely a Zepp where the
1/2 wave radiator is vertical is something I discovered a few years
ago. I have a dual-band J-pole on 10m/6m which works well.
Note that the bottom end of the 1/4 wave matching stub is
shorted. By attaching coax to the stub one can find 50-ohm match
just by sliding up from the ground end. It was about six inches for
the 10m J-pole.
I do not have my construction page back on my website as yet. I used
aluminum tubing about 25-foot long for the 10m version. You might
want to use a common-mode choke at the coax feed to prevent coax radiation.
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
[email protected]
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