Is the shield still good? If the foil corrodes it becomes a lot less
conductive. You'd have to cut off a piece of cable and peel it apart to
see. The foil turns from shiny to dull, and if you check resistance
between shiny parts it's 0, but between the dull parts it'll be meg
ohms.
For ferrites look at fair-rite.com for one with high impedance near
149mhz. Clamp is easier to install. A ring you can loop through
multiple times. The impedance increases by the square of the number of
loops, so you could get a better result that way. It might end up
needing some trial and error to get it right.
------ Original Message ------
From: "Craig House" <[email protected]>
To: [email protected]
Sent: 6/7/2017 10:27:52 AM
Subject: Re: [AFMUG] Interference on a repeater at 149 MHz
They are Mylar shielded cat5 cables If you mean in conduit though no
they are not in conduit.
If someone thinks the ferrite solution is worth a try what ferrite do
you use. Clamps or rings? One end of the cable or both? If rings,
how many loops of cable through them?
Sent from my iPhone
On Jun 7, 2017, at 09:10, Bill Prince <[email protected]> wrote:
Are the cat5 runs shielded? We've seen 100 Mbps ethernet can radiate
in
the 140 MHz range. Shielding usually fixes it.
bp
<part15sbs{at}gmail{dot}com>
On 6/6/2017 1:17 PM, Craig House wrote:
We have equipment located on to Towers one is a water tower the
other is a guyed110 foot tower. In both locations there are two way
repeaters located on the towers that are receiving interference from
what appears to be our equipment. Nothing is substantially common
between the way the two towers are built out. The water tower had all
of the equipment on top of the tower at one point and we have since
moved all of our backhauls down to the catwalk railing on the
opposite side of the tower from the two-way repeater attempting to
put some distance between our equipment and the repeater but has not
solve the problem.
We have ePMP both 2.4 sectors and the 5 GHz Omni as well as some
ubiquity air fiber five and Power beam M5 radios on the water tower
all running off of net tonics 24 port switch and the microtik router.
The other Tower has only a few m5 radios and and M2 Omni. It also has
an air fiber 5X amount of lower on the Tower around 55 feet.
Everything on this Tower has ethernet cable's running to the base
where our equipment is running from an old CMM micro or their own
power supplies in the case of the air fiber. Everything at this Tower
is located inside of a metal communications cabinet at the base. In
both locations we have removed old 900 FSK radios which were a source
of interference but the problem seems to have come back. I'm looking
for ideas on what others have found may be the source of interference
or solution because I'm tired of throwing darts blindfolded and
hoping I find the right Target.
Sent from my iPhone
