It does seem that LMR-400 may be an overkill for 40 meters. RG213 is very
durable and certainly suitable for this application. Good luck.
----- Original Message -----
From: "Tower (K8RI)" <firstname.lastname@example.org>
To: "Alan C. Zack" <email@example.com>
Cc: <firstname.lastname@example.org>; <email@example.com>
Sent: Tuesday, October 12, 2004 11:18 AM
Subject: Re: [TowerTalk] Replacing coax question
> 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.
> > firstname.lastname@example.org 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" <email@example.com>
> >> To: <firstname.lastname@example.org>
> >> 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?
> >> 73,
> >> Tom W8JWN
> See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
> TowerTalk mailing list
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
TowerTalk mailing list