Doug,
I agree with all of the advice quoted below. My two towers both have
the bottom section in the concrete pour, and were plumbed simply using a
standard bubble level, with the bottom section temporarily guyed during
the pour. Once built, guys were tensioned using a Loos gauge, and are
periodically (every few years) using that Loos gauge. During the initial
build, tensions were adjusted so that there was no visible wiggle. The
tallest of my towers is 120 ft of Rohn 25, with guys at 30, 60, 90, and
120 ft. The shorter one is 45 ft of "Rohn 35" (really a private-labeled
wider-gauge tower that's between 25 and 45 in spacing and construction,
specified by Motorola for 2-way installations). The shorter tower is
unguyed, and sits on a LOT of concrete.
73, Jim K9YC
On Fri,2/12/2016 4:19 AM, Stan Stockton wrote:
Doug,
What Ed and Ron said is ABSOLUTELY the best advice... but you had already
gotten that advice and decided you wanted perfect.
None of us have seen your tower so we don't know what it looks like. We do
have your measurement from your plumb bob and several of us believe you simply
do not have a problem.
If a knowledgable person can walk up, take a look at your tower and quickly
tell you that it is not vertical, I might fix it. If it is clearly and
visually so out of plumb that you are embarrassed by it, I would fix it. If
you have to use levels and plumb bobs and spend ten minutes evaluating whether
your tower is vertical, you don't have a problem. You may have other problems
but your tower not being straight enough isn't on the list.
73... Stan, K5GO
On Feb 12, 2016, at 5:20 AM, Ed Sawyer <sawyered@earthlink.net> wrote:
"His tower is only out 1.5 inches at 20 feet which would be 3.0 inches at 40
feet his final height. I think he should put guy lines on it, go to 40 feet,
make sure the tower is straight (even at an 3" angle) then put an antenna on
top, go inside and work a contest."
Ron W8RJL
I agree with Ron. Define straight. I looked into this back when my first
tower went up here and I saw that the tower was out of plumb about 3 inches
at its 70ft total height. (my second one here is about 1 - 1.5 inch at 70
ft). I found in research that perfectly plumb was neither easily achievable
nor necessary for a guyed tower. It seemed that a few inches (maybe up to 5
inch for a 100 foot tower) was considered "acceptable". So I decided to
just tension the 2 guys pulling in the favorable direction to compensate the
slight lean heavier than the 3rd one. With a couple of beers - it sure
looks straight to me..
That tower is rock solid with a 4 el 20M monobander stacked over a 15M
monobander (36 and 45 ft booms). Up for 10 years now and the more I look at
it the straighter it gets.
73 Ed N1UR
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