Nate,
Yeah, I remember the day... We are still on a tower from 10yrs ago and
had crazy issues. What finally fixed it is
the Superior Essex cable with rigid copper jacket. Anything else that
doesnt meet those specs with rigid shield is going to
have issues. The Belden has only a single jacket and aluminum shield and
I would bet that shield has broken down internally due to heat and
constant microwave effect. I found this after replacing our Best-tronics
shielded cable.
The foil was powder.
hope this helps
Dave
On 09/18/2018 10:21 AM, Nate Burke wrote:
Sorry for digging up the old thread, hopefully it will help someone in
the future looking through the archives
We put on a Far-Rite #2643626002
https://www.fair-rite.com/product/round-cable-emi-suppression-cores-2643626002/
core on every Ethernet cable. Just looped the Belden 7919a cable,
jacket and all, through as many times as we could (~8-10) Haven't had
any Ethernet issues for a month. We have them on the cable ends
closer to the radios, usually within about 2' of the radio. Rockets
have stayed at 100mb and EPMP at 1G.
On 7/23/2018 10:29 AM, Dave wrote:
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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