[TowerTalk] Boom Truss Clamp (Collar, Sleeve?)

[Richard Thorne]

I installed several JK Antennas last year.

Ken uses two milled aluminum halves that are attached to the boom with 
two bolts.  One of the bolts is what the truss cable attaches to and is 
centered over the boom.

The advantage is that they can be installed anywhere on the boom after 
the elements have been installed.

See https://jkantennas.com/whyjk.html to get an idea of that the clamps 
look like.  For the truss mount clamps, they have a space between the 
halves so the bolt can capture the truss cable over the center of the boom.

Not sure if Ken would sell them separately or not.

Rich - N5ZC



On 2/28/2018 7:07 AM, Jim Thomson wrote:
> DX engineering makes em in both 2 inch  and also 3 inch.     These are both just cast aluminum irrigation pipe clamps, but both using SS carriage bolt and mating SS hardware....+  SS nylock.
> They both work superb.   I have been  using both the  2 inch and 3 inch  versions  since 1980.    I live close to the ocean.
>
> The SS carriage bolt is slick, as is has a square under the domed head... which fits the square hole in the clamp.    IE:  only one wrench required to tighten.
> There is no way in hell these will ever slip on the boom, cant.   They are aprx 3/16  to  1/4  thick al.   Just use a thimble, and also some never seize goop on the SS threads.
>
> https://www.dxengineering.com/search/part-type/antenna-boom-support-brackets?tw=boom&sw=Antenna%20Boom%20Support%20Brackets       Shows  both versions,  2 inch  +  3 inch.
>
> https://www.dxengineering.com/search/part-type/antenna-boom-support-brackets/product-line/dx-engineering-atbb-2-boom-brackets?autoview=SKU&sortby=Default&sortorder=Ascending    2 inch
>
> https://www.dxengineering.com/search/part-type/antenna-boom-support-brackets/product-line/dx-engineering-atbb-3-boom-brackets?autoview=SKU&sortby=Default&sortorder=Ascending    3 inch
>
> ONLY trick to using either sized clamp is that it HAS to be slid over that part of the boom ..1st !      It can not be added..after the fact... like say a 2 piece clamp assy.
>
> Jim   VE7RF
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