We are co-lo'd with a 5K transmitter and similar run but we finally went
with Superior essex rigid copper shield cable
and used the faraday method of grounding. It was easy since the pmp450i
came along we just had to make sure the rj45
was just long enough to connect with the metal grommet have the outer
jacket inside it.
Did this a year or 2 ago and no problems since. We also have surge boxes
inline as well. where before we could not even think of adding them due
to the cable interference. The CMM5 has helped a bunch in keeping a
flawless connection.
On 07/20/2018 11:31 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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