That is a great idea! Thanks.
Keith NM5G
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Eric Scace K3NA
Sent: Tuesday, August 17, 2004 3:57 PM
To: Tower (K8RI); Jim Idelson; TowerTalk Post
Subject: RE: [TowerTalk] Tramming
This reminds me...
One can relieve a lot of sideways forces on the top of the mast when
tramming up a large, heavy antenna. The trick is for the tram line run from
the ground up to the attachment point at the top of the tower, and then
continue down the opposite side of the tower to an anchoring point on the
ground. The continuation acts as a back-guy on the mast. The back guy can
be a separate piece of material... but best if attaches to the same point on
the mast. If you use two separate lines, try to tension them equally.
Keep the two anchor points and the mast in the same vertical plane so as to
limit the attempt by misaligned downward force to pull the mast out of
column.
-- Eric K3NA
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com]On Behalf Of Tower (K8RI)
Sent: 2004 August 17 16:32
To: Jim Idelson; TowerTalk Post
Subject: Re: [TowerTalk] Tramming
My preference would be one of the Kevlar based cables which is what I use
for guy lines.
Although much easier to handle and store, lighter weight, and though they
are much easier to damage then EHS. That means the tram needs to have good,
smooth pulleys, and no sharp edges. The ends also need to be sealed from
moisture. Due to their light weight and strength they have very little
catenary. This really shows when you run a tram up one carrying a heavy
weight as there will be a pronounced dip at the tram the size of which
depends on the weight and cable tension.
Even taking all that into consideration, I still prefer the Kevlar cables.
Roger Halstead (K8RI, EN73 & ARRL Life Member) N833R, World's Oldest
Debonair (S# CD-2) www.rogerhalstead.com
_______________________________________________
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.
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_______________________________________________
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.
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