Hello all,
I am considering running split antennas at my 220 MHz site in
Philadelphia as a test to increase sensitivity and troubleshoot a
duplex noise issue. The machine is currently a modifed Motorola
Micor using a TX/RX 4 can duplexer, DCI bandpass filter in the RX
leg, and a Comet Super 22 (220) base antenna.
I am considering running separate Super 22 antennas 12 feet apart
horizontally. One feedline run will go from the transmitter direct
to the TX antenna. The other feedline run will run from the receiver
to RX port of duplexer, common port of duplexer to 220 bandpass
filter and then to the RX antenna. The TX port of the duplexer will
remain unconnected.
I expect the duplexer to act as a 2 can deep notch, eliminating the
transmitter from the receiver with the TX port open. I assume the TX
rejection in the receiver line should improve and the resulting RX
sensitivity should improve since the transmitter has been reduced to
a strong near field instead of RF on the same line. Is this the
correct theory of using a duplexer in a split antenna site and if so,
should the TX port be left unconnected or capped with a 50 ohm load?
Thanks in advance,
Steve
K3PHL
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