At 01:34 PM 5/23/05, you wrote:
> Hey Guys,
> Well few of us played with the repeater today. We took the preamp
>out of line and then did the "desense test". We shut the transmitter
>of, opened the squelch and listened to a weak station on input of the
>repeater, when the transmitter was enabled I was the only one to
>notice any desense. It was a very minute amount. I think I am going to
>try the preamp route with an attenuator in line.
You need to put a test meter on the first limiter, and use that as
your desense detector. The second limiter is also interesting to
look at with weak signals. Hard numbers are always better than
guessing with an uncalibrated ear. An analog VOM plugged into
the test jack is all that is needed.
> Just thinking, what if we ran the setup like this: repeater, then
>band pass filter on the rx side, then preamp, then duplexer. Would
>that help alleviate some of the desense from the preamp?
you might try the sequence of
antenna-duplexer-cavity-preamp-attenuator-receiver.
Mike
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