[TowerTalk] Adding tower height

w2id at optonline.net w2id at optonline.net
Mon Oct 30 13:17:00 EST 2006


Correction in formula:
(h2^2 + r^2) ^ 0.5   - (h1^2 + r^2) ^ 0.5

( had extra close paren after h1^2  )


----- Original Message -----
From: w2id at optonline.net
Date: Monday, October 30, 2006 1:13 pm
Subject: Re: [TowerTalk] Adding tower height
To: Bryan Bydal 
Cc: towertalk at contesting.com

> 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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> > 
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> 
> 
> 
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