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Guy Line Tension

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Subject: Guy Line Tension
From: (Roger L. Elowitz)
Date: Sun, 15 Dec 1996 21:15:12 -0500
Hi Guys,

I know that this just might sound a bit silly with all you big guns and tall
towers but... who better to turn to for advice?

I just put up a 3-section (9-ft ea) push up mast on the top of my garage
with the lowest section bracketed to the side of the house for just about
it's full 9-foot length. The second and third sections are guyed in three
directions with 1/8th inch diamond braid dacron Kevlar core line that is
supposed to be rated at 450# tensile strength.

On the top of the mast is a Ham-M rotor, a Cushcraft A-144-11 2m beam, about
4 feet above that is a 23-el ATV beam and way above that (about 8-ft) is an
AEA isopole for two meters.

Now the question I have has to do with guy line tension. My friend, who is
an Industrial Arts teacher and who helped me install the set-up, says that
the guy lines which run down to the garage roof at a steeper angle than the
guys to the house roof- need a greater amount of tension to keep the mast
vertical. This he claims is because of the shallower angle naturally
requires more tension.

Well, I have a bad track record when it comes to doubting people, (BETTER
stainless IS NOT MAGNETIC) but, I had the opinion that the angle of the guy
to the tower should make NO DIFFERENCE when it comes to tensioning them and
that I should aim for equal tension in all the lines.

To be on the safe side..... I left the guys with the steeper angle much
tighter than the others. Of course, I don't have a tension gauge so I really
have no idea if I am anywhere near the maximum rating on this guy material.
I do know that the mast is as vertical as I can possibly make it.

Your thoughts on this subject- on the reflector, would be much appreciated
as perhaps this subject applies equally to guying any structure with any

Thanks all,

Roger, (easily snookered) K2JAS  


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