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Re: [TowerTalk] Replacing coax question

To: "Alan C. Zack" <>
Subject: Re: [TowerTalk] Replacing coax question
From: "Tower (K8RI)" <>
Date: Tue, 12 Oct 2004 14:18:59 -0400
List-post: <>
Why not use a single piece of LMR-400 flex? It'd have still less loss and I believe it's cheaper than 213.

As for splices, I use the flooded heat shrink and have not had any failures (leaks) so far.
OTOH at 40 meters the loss between old fashioned RG-8 and even Heliax is hardly worth mentioning./
Roger Halstead (K8RI ARRL Life Member)
Worlds Oldest Debonair (N833R S# CD-2)

Alan C. Zack wrote:

I agree. Please correct me if I am wrong but I believe RG-213 is flexible enough to use for the rotation loop at the beam as well as where it would loop on the side of the tower when you crank it up or down. You could have one continuos coax run and not have the concern of moisture getting into your splice points. wrote:

I would use a single piece of Belden 8267 RG-213 for this. It's durable,
there would be fewer connections and it would have less that 0.5 dB loss.

----- Original Message ----- From: "Tom Martin" <> To: <> Sent: Monday, October 11, 2004 18:36 Subject: [TowerTalk] Replacing coax question

I am replacing a 90' length of RG8 water damaged coax to my 40 meter beam.
I have LMR 400 for the main run up the tower but want to use a RG8 section
for the rotator loop. There are two ways to do this. First, a 14' section
of RG8 from the feed point of the beam with one PL259 and one barrel
connector to join the LMR. Secondly, a 10' section of LMR and PL259 to a
barrel connector and a 4' section of RG8 for the loop to join the LMR that
goes down 80' to the antenna relay box at the base of the tower. This
configuration would require 4 PL259's and two barrel connectors. I want to
avoid the many possible problem areas with the multiple connections. I
think that I have answered my own question but wasn't sure if adding that
much RG8 to the run would offset the benefit of the LMR 400. I suppose on
40 meters the loss would be negligible. Am I correct?




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