> -----Original Message-----
> From: Ken Arck
>
> <---What bothers me here about using a circulator is that you say it only
> occurs when your TX is active. This doesn't sound like IM to me, as that
> would occur regardless of whether the tx was active or not (IM is produced
> when external RF comes down the TX line and mixes in the PA stages. This
> does NOT require that the PA actually be making power).
Good point. Yes, it only occurs when the 2m repeaters tx is on. Basically,
what I see on the spectrum analyzer (connected to the rx port of the
duplexer) is several signals coming and going within the passband of the rx
cavity (+/- 300kHz approx). I can tune the analyzer to a specific carrier
and hear either voice traffic or control channel. All of these signals are
around -90dBm at the rx port. As soon as the 2m transmitter is turned off
the carriers on the rx port disappear.
>
> It sounds more like a classic case of mixing. Have you run all the freqs
> involved to see where the possibles might be?
At this point no. However, I'm in the process of obtaining all of the 800
freqs to do a calc.
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