Hi Bryan,
When you originally put up this tower, did you leave enough extra length in the
guys to raise them up the tower a few feet?
Pythagorus will tell you how much extra (currently unused) length you will need
when you raise each guy:
(h2^2 + r^2) ^ 0.5 - (h1^2) + r^2) ^ 0.5 feet of guy,
where h1 is the original (lower) height, h2 is the new (heigher) height for
that guy, and r is the horizontal distance to the anchor, assuming it is at the
same elevation as the tower base.
Have fun!
John
W2iD
----- Original Message -----
From: Bryan Bydal
Date: Monday, October 30, 2006 12:30 am
Subject: [TowerTalk] Adding tower height
To: towertalk@contesting.com
> I had asked questions earlier about this project and have a few more.
>
> I am adding 20 ft to a 100 ft existing 45g tower I built 7 years
> ago. All antennas are now off the top and I need to remove the
> flat-top top section.
>
> The plan is to loosen the top set of guys and move the bracket
> down about 3 ft to the top of the next straight section. Set
> "modest" guy tension.
> Then remove the top section and lower it down.
> Then move the middle set of guys up to the new height of 75ft.
> Set modest tension on those guys.
> Climb down and move the lowest set up to their new height of 35 ft.
> Set the guy tension of the middle and lower sets of guys to spec.
> Raise the 2 new straight sections and the top section into place.
>
> Move the top set of guys up to their new height of 111ft.
>
> The guys are connected to the rohn guy bracket assembly and I
> would like to disconnect the guy wires at the anchors and move
> them as an assembly up to the next guy point.
>
> Again, while doing the guy moving, I will keep only modest guy
> tension on the upper guys to reduce downward force while moving
> guy wires.
>
> Does that sound like the proper procedure for this project?
> Thanks,
> Bryan W5MX
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