Very Interesting Mark , I know that in the past I recall vaugely that I
have came accross some sort of oscillation that can be picked up on a
particular frequency but the distance you mentioned is something that
each of us can probably came across this some time or another.
Meanwhile back 2 the auctions.
Mark AB8RU
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.
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>Yahoo! Groups Links
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Yahoo! Groups Links
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