We had a similar problem several years ago. We were getting a beat
frequency between two high power transmitters. The thing that fixed it
for us was the snap-on torroids at each end. Depending on power levels,
you might want the conduit as well. It helps to know what frequency you
need to attenuate; the torroids match specific frequencies.
We got the torroids from Fair Rite: https://www.fair-rite.com/
bp
<part15sbs{at}gmail{dot}com>
On 7/20/2018 9:31 AM, Nate Burke wrote:
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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