Jim
If you are referring to the Rohn TA45 then that is exactly what I have done
using angle sections only I have placed the torque triangle at the location
of the rotor since that is where the twisting moment of the rotor/antenna
system is felt by the tower. BTW I mispoke when I said that the arms were
bolted to two of the legs each. They are bolted to one leg each as with the
TA45. Guess I must be gettining into my dottage.
73
Bill
W7VP
----- Original Message -----
From: "jim Jarvis" <jimjarvis@optonline.net>
To: <towertalk@contesting.com>
Sent: Saturday, November 08, 2008 5:54 AM
Subject: Re: [TowerTalk] guying self supporting towers
>
> Like so many threads, this one took on an extended life, sweeping up
> a lot
> of related topics. Bill, W7VP provided an extended analysis of the
> tower
> structure, which was quite thorough.
>
> One area, though, (below) raised a question in my mind:
>
>> One thing I have done with my own tower is to build a triangular
>> bracket
>> which is attached at the base plate of the rotator. The bracket is
>> attached
>> to the tower legs so that each leg of the bracket is attached to
>> two legs of
>> the tower. This give a longer moment arm for the guys to pick up the
>> rotational moments of the antenna system. Even better would be to
>> create a
>> "Y" in the guys near the top so that the moment from the rotator is
>> picked
>> up at an angle on the base thus increasing the effectiveness of the
>> guys in
>> resisting rotational moments.
>>
>> 73
>> Bill
>> W7VP
>>
>
> For those of us with Rohn towers, wouldn't use of their torque arm
> guy brackets
> make sense? Amateurs tend to simply drop preform loops over tower
> legs, as we go up,
> but the torque bar assemblies make for a much more rigid system.
> And the
> reason they were designed is precisely that described by Bill.
>
> N2EA
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