I am buiding a VHF repeater witha Motorola Quantar and am finding a
strange IM/Desense issue. Whn I attach an antenna to the system I see
a small carrier at +4.5khz from the carrier frequency. I have verified
duplexer tuning, tried several anenna and feedline combos, and
everything else I can think of to find/eliminate this issue to include
changing frequencies and retuning the whole mess. It works fine into
the service monitor with no spurious emmissions and no problem, only
on the anteanna system do I see this. There are no other emmitters
within several miles so it is not a local IM type thing. Has anyone
else setting up a VHF quantar seen this sort of issue? Could it be
related to the quantar itself with the 600k split? I am using a 6 can
BP/BR duplexer and measure over 130dBm of isolation TX-RX...
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