Richard wrote:
Just wondering: If you had a 33 foot horizontal wire, fed at one end with a
ladder line, which was connected to an atu, it would work on 20 metres, but
would it work on 40, 80 and 160metres? TIA.

On 40m, 80m, and 160m, it would act more like an inverted-L
with lots of feedline radiation. On those bands, you might
as well put up an inverted-L.

On 20m, it would have a very high feedpoint impedance in the
neighborhood of thousands of ohms. The feedpoint current is
pretty low so the current unbalance has a limit. For 100w, the
feedpoint current would be about 0.15a. Of course, the feedpoint
current in the other wire is zero since it is floating at the
antenna feedpoint.

On 40m, it would have a very low feedpoint impedance in the
neighborhood of 40 ohms. For 100w, the feedpoint current
would be about 1.5a, a magnitude more current unbalance
than the 20m case.
--
73, Cecil http://www.qsl.net/w5dxp


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