Have you considered adding a CTCSS decoder to your repeater? It
won't hide the problem ... but you hopefully won't go insane in
the process.
Neil - WA6KLA
Mark Ramsey wrote:
>
> Whew after nearly a year of interference to my uhf amateur radio
> repeater I found the problem. Turned out to be a Uniden scanner more
> than a mile away from repeater site! The local oscillator for
> channel 7 in the scanner was right on frequency for the repeaters
> input and was tripping the repeaters squelch every time it scanned by
> about once a second. The interference could not be heard from a
> mobile radio tuned to the repeaters input but could be heard well
> from a hand held hooked to the repeater antenna (db420). Many
> attempts had been made to find the trouble by driving around
> listening for the clicking sound generated by the scanner with no
> luck. By this time I had figured out it was a scanner causing the
> trouble because the problem would go away when there was activity on
> virtually any of the local police or fire channels, the scanner
> would stop scanning by channel 7 and the repeater would quit
> kirchunking. Completely fed up (can't take no more) I decided to
> take a different approach. I found by transmitting on one of the
> public service channels the scanner could be made to stop on that
> frequency, Yes I realize this not exactly legal but remember I can't
> take no more. Anyway after a few short transmissions away from the
> repeater site I found the general area. Now in that area I am able
> to switch on my service monitor and transmit a weak signal and
> attenuate it as I get closer the whole time listening to the repeater
> kirchunk. Finally I must be close I can hear the interference on my
> ht tuned to the repeaters input. Bad news it is an apartment complex
> with about 100 units crammed in a small area. Time to walk around
> complex with ht and listen. Wow now I have narrowed it down to 4
> apartments! Let's talk to some of the neighbors standing outside.
> One person said "it's got to be that mean old lady across the street
> she's got a scanner but you don't want to knock on her door she is
> just plain mean". Walked over there with ht, no problem not there
> thank goodness. Talked to someone else she said "I know everyone
> here except apartment 4 and I can tell you no one has a scanner". I
> thanked her and knocked on apartment 4 door not knowing what to
> expect would they be nice would they be mean would they be
> understanding would they be home? The door opened one glance into the
> living room revealed a Uniden scanner. I explained the situation to
> the gentleman at the door who turned out to be one of the nicest
> people I have ever met. He allowed me access to his scanner and the
> channel causing interference to my repeater was one he doesn't even
> listen to nothing even in the area on that frequency. We programmed
> another frequency into channel 7 he's happy I'm ecstatic and the
> problem is cured. Thank you I said and drove home. Can you believe
> this? It's true.
>
>
> Yahoo! Groups Links
>
>
>
>
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