[TowerTalk] Fastening sections of 3" boom material

[Bill Winkis]

Yes...
You take a piece of the same tubing cut a length about 20% of the 
entire boon, (6' for a 30 ' boom). now cut a 1/4 inch wide slit out 
of the length of the insert...now take hose clamps-compress 
it...slide it into the two half's, center it ..remove ther hose 
clamps...now sheet metal screw the assembly together.....redesign 
your boom to mast bracket so it grabs at least 10 inches of the boom 
on each side of center.....use a strong back  that is 15% in on each 
boom end..and your all set...

I've done this on all my W2PV (3" boom) monobanders, out to 44 and 56 
feet. used two strong back on this length of boom..and never had a problem...

-Bill

At 12:36 AM 11/21/2006, you wrote:
>I'm considering building a long yagi for 20 meters and I see the ARRL
>antenna book recommends using 3" aluminum tubing for the boom. One
>thing I don't find is how to connect the sections together. There
>doesn't appear to be a standard tubing size which would slip either
>inside or outside the 3" tubing to allow clamping or riveting. Or
>maybe I just missed it.
>
>Any suggestions?
>
>Bill, W6WRT
>_______________________________________________
>
>
>
>_______________________________________________
>TowerTalk mailing list
>TowerTalk at contesting.com
>http://lists.contesting.com/mailman/listinfo/towertalk