For my homebrew antennas I fasten a small plate of aluminum to the mast with
a u-bolt. The plate has holes on each end and I connect a 3/8 EJ turnbuckle
to each side of the plate for the boom truss. For larger antennas I mount a
piece to angle stock to the mast, perpendicular to the boom and use two
turnbuckles on each half of the boom (four total) to create a V truss.
John KK9A
To: <towertalk@contesting.com>
Subject: [TowerTalk] Truss clamp for 2" mast ??
From: "Jim Thomson" <jim.thom@telus.net>
Date: Tue, 20 Jul 2010 18:50:35 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Ok... I'm not impressed with the F-12 method of securing the over head
truss
line to the 2" mast.
The F-12 method consist of looping the 1/8" SS truss cable through the
"U"
portion of a standard
U-clamp.. with the saddle on the back end of the mast. While this method
works, it's an absolute
bitch to get some tension on the truss line. IE: you have to push up on
the
U bolt.. and hold it there, then tighten
the U bolt.
Does anybody make a 2 x piece clamp that will clamp onto a 2" mast, such
that a SS /galvanized small
turnbuckle can be installed on either side of the 2" mast ??? That would
make life a LOT easier. Of course,
the one coninuous piece of stock truss line would have to be cut in the
middle, and either cable clamps or nicropress crimps
installed + a pair of thimbles, etc.
I can envision the proposed 2 x piece wrap around clamp assy in my head.
Plan
B is... since I use several HB mast steps
already, which use a single DX eng super mast clamp assy, I might be able
to
slide a thin piece of flat bar steel between
the 2 x clamp halves... and drill it for a 3/8" hole. Then the G-8 bolt
would pass through both halves of the mast clamps
plus the flat bar in the middle. Once tight, there is a small gap between
the
2 x halves of the DX eng clamps anyway.
The flat bar would pivot down on an angle, and the other end of the flat bar
could be used to terminate one
end of a turnbuckle.
What do other folks use to terminate an over head truss ?
later...... Jim VE7RF
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