[TowerTalk] Tram Line Material

[W3YY]

Jim -

I use 3/16" galvanized aircraft control cable for my antenna tram line, but
have never taken anything over 100 lbs up the tram.  I believe this cable
has a rating of around 4000 lbs.  Remember, however, that the tension in the
tram line is much more than the antenna weight.  Anyway, this cable has
worked fine for several projects over the last 25 years or so.

Bob - W3YY


----- Original Message ----- 
From: "Jim Idelson" <k1ir at designet.com>
To: "TowerTalk Post" <towertalk at contesting.com>
Sent: Monday, August 16, 2004 10:59 PM
Subject: [TowerTalk] Tram Line Material


> For years, I've been using a heavy low-stretch rope as the main tram line
for
> tramming antennas up and down the 80 foot tower. It's worked well, but
it's a
> borrowed rope, and it may not be available for an upcoming project. I'd
like to
> acquire the best possible tram line for this and other future projects.
The
> antenna will weigh about 170 lbs, and I'm thinking that the tram line
should be
> a piece of wire rope. The max length will need to be about 130-140 feet.
I'd
> plan to put a fixed loop on the tower end, and I want to secure the lower
end
> at any point on the rope [depends on the antenna and how high it needs to
be
> trammed on the tower]. I'd like to be able to manage and store this line
> easily, too.
>
> What materials and termination methods do you recommend?
>
> 73,
>
> Jim Idelson K1IR
> email    k1ir at designet.com
> web    http://www.designet.com/k1ir
>
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