It's all down to effective weatherproofing.
At work, my area of responsibility has around 800 microwave links, all
using runs of Belden 9913 for the IF cables. Each link will have
between 2 and 8 runs of 9913, each run between 20 & 300m long.That's a
lot of cable and connectors!
Rarely see any water ingress problems and Scotland is a very wet
place. For connectors we just use self amalgamating tape, 3-4 layers
then a UV resistant electrical tape on top.
9913 is great, just pay attention to weatherproofing. But that goes
for all coax...
73 Gavin
GM0GAV
----- Original Message -----
From: "Paul Christensen" <w9ac@arrl.net>
To: "xppq" <xppq@pyramid.net>; <Towertalk@contesting.com>
Sent: Saturday, October 05, 2002 12:37 PM
Subject: Re: [Towertalk] coax for new tower
>I have opportunity to use
Belden 9913 plenum( 89913) 50 ohm
coax on new tower - any known problems
with this Product???
Yes. Under certain climatic conditions, 9913 has been known to draw
outside
water vapor into the line. This will typically occur on a hot day
when the
jacket is exposed to the sun, and suddenly, a burst of rain cools the
jacket, allowing moisture to contaminate the area around the
connectors.
I have had 9913 completely ruined by such events here in Florida. No
amount
of dry air evaporation would help once the line became contaminated.
Unless
you are absolutely certain that moisture ingress will not occur and
your
connectors will remain well-sealed for many years, DO NOT use 9913 in
an
outdoor environment.
-Paul, W9AC
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