Hi Bryan, the only change to 55G sections over the past 30 years or so (in
my recollection) is the Z brace bending radius has increased. This is most
likely a change to make the Z bracing more resistant to work hardening and
subsequent fracture failure.
This is absolute guess work on my part and may have no merit at all. I have
used 55G with both types of Z braces and the older version does seem more
resistant to torque forces. This is noticeable mainly on rotating towers
where there is no method of using guy assemblies to reduce tower torque
caused by large antennas mounted directly to the tower sections.
I am not suggesting this is a problem; merely an observation.
In your case, does the guy assembly fit the bottom of the next section? If
so, that might be a good location and gets some torque forces off of the
leg bolts/joints at that location. Not that it is a problem, but every little
bit helps.
73,
Gerald K5GW
In a message dated 1/19/2012 6:59:06 A.M. Central Standard Time,
bryanr@bometals.com writes:
Has anyone ever noticed that the Rohn GA55GD guy bracket assembly cannot
be
mounted on the uppermost tower brace on a given section of 55G? The
profile
(vertical dimension) of the bracket interferes with the leg-joining sleeves
on the section just above.
I wonder if this was just an "unfortunate feature" resulting from the 222-D
engineering revisions or were they intentionally trying to inhibit the
bracket from being mounted on the top brace?
-73 de W4WMT (Bryan)
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