Ferrite beads/cores around the cat5 as well as choke coils of cat5 seemed to
help many with this problem.
-----Original Message-----
From: Nate Burke
Sent: Friday, July 20, 2018 10:31 AM
To: Animal Farm
Subject: [AFMUG] Ethernet problems next to FM Antenna
It looks like the old archives aren't back online yet, so I couldn't go
searching through there for ideas.
I have a site where we have been co-locating with a 800w FM Transmitter
for years. We've always had Ethernet problems at the site since the FM
went in. Everything is shielded cat5 (Belden 7919). It is at a grain
elevator, our equipment is on one corner of the platform, and the FM
Transmitter is on the other corner. We are horizontally separated by
about 10 feet. There is no way to get vertical separation. I used to
run all the cables down to the bottom of the leg, about 100'. In an
effort to make the Ethernet work better, I installed an Edgepoint fed
with Fiber at the top, so cable lengths between the radios and the
Edgepoint are now 5'-10'. With the FM Transmitter turned off, everything
runs perfectly. When the FM is turned on, most equipment drops to
100mb, and some goes down to 10mb. On the most problematic equipment, I
have installed the 4 pair FM Filters from Sandman
http://www.sandman.com/rf.html within 12" of both the switch and the
radio. It made no change.
What FM Elimination tricks have I forgotten to try? I was really
expecting the short cable lengths to solve the problem.
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