[TowerTalk] Adding tower height

[w2id at optonline.net]

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 at 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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