OK, this is making me nuts. I have changed jumpers about 3 times
thinking I have a cable problem but I am convinced it is not the
cable. Here are the symptoms:
220 Hamtronics receiver (very old, no labeling on the board). Tunes
great on the bench (.15uv 12db sinad). Installed into rack still
tests great. Hookup to the duplexer and sensitivity goes to crap
(1.5uv).
However, if I back the PL connector (I know, not my repeater, just
helping) on the cable to the rx out of the T connector on the
duplexer, the sensitivity improves dramatically. As soon as the
ground on the connecter touches the duplexer the signal dies.
I have done this without the tx transmitting but connected and
disconnected with no difference. My service monitor is hooked up to
the t connector on the antenna port of the duplexer.
I could see if this happened with the antenna connected to the
duplexer. I would guess it is overload from other rf desensing the
receiver. But this is happening with the service monitor hooked to
the duplexer.
BTW, this is a 4 can tx/rx duplexer that was sent to tx/rx to be tuned
and it came back doing the same as when it left so I don't think it is
the duplexer.
I don't know enough about this but, could this be a problem with the
receiver and how it couples with the duplexer? I hate to order a new
receiver without being relatively sure that it is the problem.
Thanks for any guidance!
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