At 4/26/2004 05:59 PM, you wrote:
>I have a repeater with an antenna up about 60 feet in the air,
>Frequency of 146.925/146.325 minus offset. Receiever sensitity
>is .25 micorovolt at 12DB, seems to be purring along just fine. IFR
>show the receive to be on frequency. Here's the problem, there is a
>repeater about 50 air miles away, on the pair of 146.910/146.31o
>minus offset. There repeater is getting into my receiver, causing
>the repeater to key up. There is no pl on my repeater at this
>time. They sound like they are on sideband when they come in. I
>can goto the 91 machine, hear them talking, when they quit, the
>interference quits. I took my IFR and inserted a tone on 146.310
>into my receiver, it took 15 microvolts to open the squelch of my
>receiver. Is it my receiver, which is a Regency receiver, or is it
>the person transmitting on the other machine. I could see if it was
>the 91 machine if all it was doing was killing my receive, but it's
>actually keying up the repeater. SO my guess would be it would have
>to be the person talking on the 91 repeater. I hope I explained
>this right. Any suggestions. Thanks.
If both repeaters are running the same offset, the problem is due to a user
of the 146.91 repeater being either too close to your repeater and/or
running excessive deviation. It is not directly due to the 146.91 (-)
repeater's TX.
The best solution would be to reverse the 146.925 (-) repeater to 146.325
(+). Our bandplan in SoCal inverts the pairs every 15 kHz in order to
prevent the situation you now have. So long as the repeaters are properly
spaced & maintained, it works great. Not easy to accomplish, but easier
than trying to get a user to move or turn down their deviation.
You can CTCSS-protect your input to prevent the unwanted keyups, but your
input will still be blocked by the interfering adjacent-channel signal.
Bob NO6B
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