Mathew,
No, you should not disturb any of the hookups between your duplexer and
antenna, transmitter, or receiver. What I meant by a "separate antenna"
is one connected to the output of your service monitor, and which
radiates a signal that is picked up by your repeater antenna.
This method will prove or disprove whether desense is caused by your own
transmitter. It will also enable you to determine if desense is being
caused by a nearby transmitter on a different frequency, if the SINAD
reading suddenly drops while your repeater transmitter is disabled. If
this happens, you can use a spectrum analyzer to sweep the band several
MHz each side of your receiver frequency and note what carriers are
present at the same time your SINAD drops. As I noted in a previous
posting, a bandpass filter may be needed to eliminate desense caused by
a nearby transmitter.
73, Eric Lemmon WB6FLY
Mathew Quaife wrote:
>
> Could I get by using a separate antenna to test for desense? Say leaving
> the antenna for the receiver through the duplexer and hooking the
> transmitter up to another antenna, would that work the same to test for
> desense. I tried to make an iso-tee, did not have real good luck with it,
> but then as far as a machinist, I have no luck at that, hihi....
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