'Doc wrote:
Mark,
On 40meters, adding an 80 meter dipole to the 40 meter
loop won't 'mess' things up much. It'll change the radiation
pattern, make it sort of directional, kinda. No big deal.
But, on 80 meters, the 40 meter loop acts like a 1/2 wave
'short' between the two halves of the dipole. SWR goes up
close to around 500:1, the transmitter is looking at something
on the order of '300R - 2500J'. Not too good, and as for the
lower radiation angle, it really doesn't make a lot of
difference at that point.

Doc, ask yourself - why would the 80m signal rather flow into an
impedance of 300-j2500 than into an impedance of 70+j0? Answer:
it wouldn't. An 80m 1/2wl dipole in parallel with a 40m 1wl loop
is a perfectly acceptable configuration as far as feedpoint
impedances go.
--
73, Cecil http://www.qsl.net/w5dxp



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