W0UN wrote:
>Actually I think optimizing them with modern NEC-based tools is worth
the effort, especially if you really want to achieve the promise of the
dual-driven elements. While you won't get a lot more gain, what you
can get is more bandwidth, especially for the VSWR and the F/B specs.
~0.9 dB gain, ~8 dB F/R and better SWR bandwidth (stock
dimensions vs optimized). The main reason I optimized mine was
for performance in a stack. Performance is much different when
two antennas are stacked versus a single antenna. I kept my
dual-driven elements in exactly their original position but let
YO7 vary everything else.
Before and after results below:
http://users.vnet.net/btippett/yagi_optimizer_7_0.htm
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and ask for Sherman, W2FLA.
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