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[TowerTalk] Torque bars for Create CR-45 Tower

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Subject: [TowerTalk] Torque bars for Create CR-45 Tower
From: WBH3@chrysler.com (WBH3@chrysler.com)
Date: Wed, 5 Aug 1998 15:17:24 -0400
Greetings all:
Actually, I have a whole bunch of questions related to the Create tower
installation I am doing on the 2nd. story of my house.  This particular
tower is almost 15 feet tall  with a base section one meter on a side.  The
tower necks down to about  7 inches square at the top.  I have no problems
getting the thing mounted securely on my roof, but I am worried about a
couple of things:

     1.I plan to put up my KLM KT34-XA.  I'm buying a 15 foot mast ,  0.12
" wall and  87000 psi., from Texas Towers.  Now the rotator mounting plate
is at the 10 foot level of the tower, so I will have 9  feet sticking out
of the top of the tower.  I plan to put the KT34 5 feet above the tower
(and thrust bearing) and the boom support bracket will be about 3 feet
above that.  So, question 1, am I being a little bit over optimistsic
putting the  beam that far above the tower?  I really don't want to put it
just a foot above the tower,.  I do plan to put a piece of reinforcing
metal on the very top of the tower for structural support.  I alsio plan to
put some bracing between the sides of the the tower at 2 different levels
also.

2.Since the KT34 has a 30 foot boom, I want to provide some torque bars to
help things along.  The tower is square  and will be guyed 5 feet up and 15
feet upl  The guys will obviously be at 45 degrees to the sides of the
tower.  I had thought about  putting steel angle iron along each edge of
the tower and about 18 inches out and then guying to that.  See
below...hope it comes out ok.
o
X
X
X
X
X
X
  X   XXXXXXXXXXXXXXXXXXXXXXXXo
X |                       |X
X |                       |X                       (note:  tower not drawn
square)
X |__________|X
                                           o XXXXXXXXXXX XXXXXXXXXXX X
X = steel angle iron
X
X           o = guy point on angle iron
X
X
X
o

Another idea is to put a plate on top of the tower,  bend the corners down
about 60 degrees and secure a strong hasp to the corners and the other end
of the hasp to an aluminum bar about 18 inches long and guy to that.  (this
seems to be a better idea in my mind).  Any other ideas or comments??
I'll be using Phillystran at 1200 lbs strength.

I'm putting 8 inch feet on each leg, each made out of 2 inch angle aluminum
a quarter inch thick.  The legs will be anchored through the roof with two
lengths of 1/2 inch threaded rod to a 2 by 6 attached to the roof joists.
The guying points will be half inch threaded rod with a welded 1 inch eye
also going through the roof  into a 2 by 6 nailed between the roof joists
(which are on 2 foot centers).  The roof is only one half inch chip board
and seems to be the weakest link here.

I realize the KT34 is a pretty big antenna but it has been a super
performer for me and I sure hate to downsize!  On the other hand, with the
expertise on this reflector,  I am sure I'll find out if I am being too
aggressive.

Thanks and 73,

Bill  WX8S



























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