Great approach--simple things can work well. I'd like to suggest an
enhancement that would improve it, particularly on the higher bands:
feeding it with balanced line (preferably open wire feedline, but
ladder line is almost as good, and even TV twinlead isn't bad). The
trouble with coax feeding a non-resonant antenna (which results in
high SWR on the feedline) is loss in the coax. The loss increases
rapidly as you go up in frequency and in SWR, and when you get to 10
meters, usually most of the signal is heating the coax. In contrast,
balanced line is nearly lossless, regardless of SWR. Plus, in
comparison to balanced line, coax is heavy, expensive, hard to fit
connectors on, deteriorates with age, and impossible to splice. If
the tuner doesn't have a balanced output, you do need a balun, like
the Elecraft current balun, at the tuner.
73
Dick, K0KK
On Jan 20, 2006, at 1:19 PM, Paul Webb wrote:
Hi all
I have just been playing with a nice and simple antenna that seems
to work
very well on all the band I have tried it on so far.
Nothing to out of the ordinary but im pleased with it. Basically a
non-resonate dipole, each leg is about 26ft and it needs a ATU to
get a
match on any band but my
Little K1 with its ATU gets a good match on all four of its bands
(40/20/30/18m) .
Just coax fed and up at about 20ft for testing and if I can hear
them they
seem to be able to hear me.
Cheap and simple to make and works!
All the best
Paul
M0BMN
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