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tone on radio when 911 keys up

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Dec 25, 2005
not on my radio (MTX-8000 B7), but one of our captains (MTX 8250), when Comm Center keys up, there is a sort of electrical buzz just for a second. we are a SmartNet sys, and County Fire is Type I. Does anyone know what this noise is, or what it is caused by? our chief has the same radio, and it does it on his too.



Feb 24, 2001
You need to be a little more descriptive than saying "electrical buzz". This could sound like multiple things.

I'm going to assume you mean a humming noise. Sounds like a ground-loop issue. Have your county/municipality radio/electronics shop/contractor check into it if it's affecting system performance or the ability to hear comm's.
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