[Antennaware] studying legacy KLM 20m big stick with eznec5
btippett at alum.mit.edu
Tue Mar 17 13:32:06 PDT 2009
>curiously, though, by tweaking the single driven element length, i
get a pretty
swr / freq bandwidth with it fed DIRECTLY with 50 ohms. was thinking of
applying the 'owa' approach with an additional director, closely spaced to
the driven element, but it does not seem necessary.
You didn't really say what you're doing. Are you replacing
the dual driven log cell with a single element (i.e. 5 total) or are
you driving one and leaving the other in place (i.e. 6 total). There
is probably little difference in the OWA approach vs log cell (i.e.
both using 6 total elements with the OWA having a close-spaced director
to match 50 ohms).
YO7 has models of KLM antennas including the log cells, and
it's fairly easy to optimize the original KLM designs with YO7.
73, Bill W4ZV
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