[amsat-bb] Minimizing de-sense on Arrow and other closely spaced antennas

["Bill Acito" <w1pa@xxxxxxxxxxx>]

Considering a set-up like many of you have used for portable work on the
LEO's (an Arrow antenna, and a dual band HT), what causes the de-sense
on the 70cm side during transmit: the 2m power in close proximity, or
the third harmonic, 3 MHz away (using UO-14 as an example)?

Would a 1/4 stub coax notch, "T"'d into the 440 side, cut for the
offending frequency, help? Or since it's also effective on multiples of
the cut frequency, it's a moot point (since it may also be close enough
to null out the downlink frequency)?

Just an idea I had rolling around in my head.

Bill
W1PA

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