On Thu, 25 Jul 2002 Pete Smith <email@example.com> writes:
> At 09:32 AM 7/25/02 -0400, Joe Mitchell wrote:
> >Hi Pete,
> >If your C3 is between the EF-240S and the guy wires, was the C3 not
> >Sounds like it was cleared of potential interference with the 240S
> but I am wondering how you did that.
When I modeled a 2L Yagi, I played with the reflector dimensions
to see where it would become 'invisible'.
Basically, any conductor Less Than 0.25 WL at the frequency of
interest is nearly invisible to a dipole driven element at 0.15 WL
spacing. Therefore ANY element tuned for 20M and above will
be nearly invisible to a 40M beam.
Note that 20M elements attached to a 24 ft boom end load that boom
to a resonant frequency around 7.5 MHz so the BOOM may couple to
40M elements IF the boom is parallel to the 40M elements.
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