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Hi All----I've got an installation here where I have three 2 meter antennas
and a 2 meter repeater that will only operate on one of them without serious
desense. The antennas are a simple J pole, a Hustler G7 ---144 and a small
triband vertical. I know that none of these have much to offer and I am now
in the market for a proper commercial repeater antenna but just the same,
what is my problem?-----only the J pole works acceptably. VSWR on all
antennas using the repeater signal reads unity or very close to it between
duplexer and antenna feed line, distant transmitt signal strength
measurement sees the Hustler a bit stronger and they all receive a distant
weak signal (repeater transmitter off) about the same (maybe the Hustler is
a bit better). What I'm saying here is that all three antennas seem to work
about right for what they are except that I get serious desense on two of
them---30 watt transmitter, a two stage isolator in place, 6 can P-D
duplexer and about 20 watts into the antennas ---- no duplexer tuning
between antenna changes. Thanks!
Scott, N6NXI
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