Jeff,
>I'd bet a box of isolators that the problems at the 165 site, NOT at the 33
>site.
I think you would win.
>Just add the mobile frequencies to the mix and you'll get the hits.
>Sure sounds like this is the problem. Without knowing anything else, my
bet
>is that the 165 repeater doesn't have enough Tx to Rx isolation resulting
in
>the preamp being driven into nonlinearity, thereby producing the mix you're
>seeing. Adding pads to the input of the preamp would be the easy way to
>confirm this is the case (while keeping all other variables, including the
>signal strength of the 33 user, constant).
Some one heard the owner of 165 talk about having to keep the power down
because of desense.
>That would be ideal, but you're talking about a 165 kHz difference there.
>That's not to say that it can't be done, but it's getting kinda tight.
>Before trying to notch out 147.93, I think the other repeater owner needs
to
>take a closer look at their isolation. Any idea what kind of preamp it is?
What about a band pass on 147.765? It may take a crystal filter or just
padding the input a little. I don't know what kind of preamp it is.
>For kicks and giggles, have someone within a mile or two of the 165 site
>transmit on 147.600 while both repeaters' transmitters (147.33 and 147.165)
>are up. That would produce the same IM product (147.600 + 147.330 -
147.165
>= 147.765) If you can get the 765 receiver to open up with this trick,
>that's one more finger pointing toward the 147.765 receiver/preamp as being
>the culprit.
We tried this, you are right. Thanks.
Fred
--- Jeff
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