I would first attempt to discover if it is the CAT5 or the radio itself.
Ask the 911 guys if they have a spectrum analyzer they can lend you to
puzzle this out.
Shielded CAT5 helps.
Putting in coils at the ends helps.
Ferrite chokes help.
Some run it in liquidtight or full metal conduit.
You can put fiber media converters on the ends of a CAT5 and perhaps fix it.
But every single ethernet device, every switch, hub, router, radio does
radiate noise. Just because they passed FCC
certification tests does not mean they are noise free. The 911 repeater
probably has a high gain omni and probably a super low noise pre amplifier
too. So it will naturally be more sensitive to noise than a normal 2 way
repeater.
Isolating it to a particular radio or cable is a good place to start.
-----Original Message-----
From: Craig House
Sent: Thursday, February 28, 2019 1:45 PM
To: [email protected]
Subject: [AFMUG] Interference with 911 repeaters
I think I’ve posted this question on here before but I want to try again.
We have multiple water towers where we have various types of equipment a
mix of Mimosa cambium and ubiquity products. It seems that on many of
these water towers our cat five power over ethernet creates RF
interference for the repeater. In one instance we were able to install
magnets that clamped around the cable which did help enough they stopped
complaining. In other cases we’ve attempted to move our equipment from the
top of the water tower down to the catwalk to create some distance and
installed the ferrite beads with little success at all. I’m tired of
playing with ideas that might or might not work. Can someone give me
advice that will solve this problem once and for all. I understand that
grounding the CAT5 might help I’ve also been told that putting our wires
inside of conduit might help or shortening the wires might help. I don’t
want anymore might help I would like someone who has actually done this to
be able to give me some advice
Sent from my iPhone
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