If I have a choice, I always prefer to make the truss support an
integral part of the antenna - not the mast. Since I home build most
of my antennas I can do that, but I have modified several commercial
beams as well to allow this.
But if you have to deal with it, you can make it a bit easier. Let
gravity tension the truss - put the beam up a bit higher on the mast,
tighten the truss and then let the beam slide down to tighten the
truss. Or rig a pulley on the mast and use a comealaong (or the
ground crew) to pull up the truss.
I've made several clamps to support the truss and turnbuckles as you
describe from "stuff" in the junk bin - form and drill some flat bar
around a 2" mast in a vice - and I have seen Sinclair clamp pieces
that would do exactly what you want.
GL with your project...
On Wed, Jul 21, 2010 at 1:50 AM, Jim Thomson <firstname.lastname@example.org> wrote:
> 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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