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Old November 4th 03, 07:03 AM
KS7J
 
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"Tarmo Tammaru" wrote in message ...
Casey,

What kind of directional antenna do you have, that you need to feed it with
450 Ohm line?

Tam/WB2TT


Well, I don't *need* to feed it with ladder line, I *want* to feed it
with it so that I can use it multi-band. It is armchair fantasy at the
moment, no antenna yet exists, but it would be essentially a 40/30 2
el. yagi (it's a bit more complicated than that, but I'm still
designing). My very preliminary modeling indicates that at resonance
you get the typical yagi directional pattern. Driving it on other
bands, even with high SWR, will yield anything from normal dipole to
meaningful gain in one direction depending on band. So, at the least I
could have a rotatable dipole on the non-resonant bands and a bit of
F/B on one or two with some luck.

73,

Casey