----- Original Message -----
From: "Jim Jarvis" <jimjarvis@verizon.net>
To: <jim@audiosystemsgroup.com>; <towertalk@contesting.com>
Sent: Wednesday, May 31, 2006 8:01 PM
Subject: [TowerTalk] phillystran for wire dipoles in trees
>
> Jim,
>
> I've run 160 and 80m carolina windoms in trees varying from 80 to
> 140' high, in Vermont and Maryland. I have them made from #12
> PE insulated superflex wire, which has a breaking strength above
> 175 lbs, and is easy to handle.
>
> I hold them up with olive drab dacron rope...variously 1/4" or 1/8".
> The latter has 700 lbs tensile strength, the former something like
> 2200lbs.
>
> Routinely ran a kw.
>
> All I do is shoot gametracker string over the top of the trees, pull up
> the
> 1/8" and pull up the antenna. Forget the pulleys. Had ONE antenna come
> down,
> in 10 years, and put it back up in under an hour. Never lost a rope. DID
> break the wire, that one time.
>
> Phillystran isn't particularly resistive to abrasion. Not well suited for
> being in trees.
That is the opposit of my experience. I've found the stuff nigh onto
imporrible to cut with a knife or box cutter and resorted to using either
cable cutters (same as the ones used for EHS) or bolt cutters but they leave
a few strands of the Kevlar that still need to be cut.
When working on Phillystran installation I normally use high quality, sharp,
cable cutters.
Just don't forget to cap the ends to keep moisture out.
Roger Halstead (K8RI and ARRL 40 year Life Member)
N833R - World's oldest Debonair CD-2
www.rogerhalstead.com
>
> n2ea
> jimjarvis@ieee.org
>
>
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