I am planning for a second tower to go up this summer, similar to your
situation. The current is 150 foot 45. I used a 3 foot level to set the
base section vertical during the foundation pour. After the entire tower
was erected, it was visually aligned vertically by adjusting guy turnbuckles
from bottom up. A slight error shows up big time at each of the 4 guy
points for a 150 footer. I dropped a plumb bob down the center from the
second guy point (75 feet) one day when the wind was calm. Came out within
an inch of center at foundation.
My second tower will be located about 200 feet away and will be a 120 foot
55. I plan to use the same alignment method. It will be interesting to see
if they appear the same from a distance.
73, Keith NM5G
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Steve
K7AWB
Sent: Thursday, March 21, 2013 3:00 PM
To: towertalk@contesting.com
Subject: [TowerTalk] misaligned vertical towers
I have two towers up. A 90 foot Rohn 45 with a 6-el 20 meter beam on it and
a 102 foot Rohn 25 without anything on it yet. Both are guyed. In putting
them up, a group of us used a Loos tension meter and our eyesight at the
bottom of each tower to make them vertical.
But when I look and align the two towers next to each other by walking
around until they are "next" to each other, one or both are off vertically
with respect to each other.
How do I figure which is straight and which is off or maybe both are slight
off?
I really don't want to climb them now in the bad weather and drop a plumb
bob and do not have a survey level. They are really 135 feet apart.
73
Steve Sala
K7AWB
DN17es
Nine Mile Falls, WA
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