[TowerTalk] 2 & 3 el 40m Booms

[Dave Johnson]

Hey Dan,

I don't know about the scrap pile but here's what I do.  A 3" boom made of 
12' pieces of 6061-T6 with .065 wall.  The splices are made from some scrap 
2 1/2" schedule 40 aluminum pipe that has a 2.85" OD so I split the pipe 
length ways then squeeze it together with hose clamps to get it in the 
tubing.  I make the splice pieces about 10" long.

The elements have 2 pieces of 2" .058 wall  spliced together for the middle. 
I made aluminum reducers that look like donuts 1" thick that will just fit 
inside the 2" tubing.  I have a 1" hole in the center of these donuts and 
slide 2 of them spaced 12" apart on a 12' piece of 1" .058 wall tubing. 
Slide these in the ends of the 2" tubing then drill and tap for a 10-32 
stainless bolt.  Next add a 12' piece of 7/8 .058 wall into the end of the 
1" tubing and adjust to the length you need.

To make the elements stronger, add a 11' long piece of 7/8" tubing inside 
the 1" making it double wall thick.  Add a 6' long piece of 3/4" inside the 
end pieces of 7/8".

I hope this will give you some ideas.

Dave - K4SSU


----- Original Message ----- 
From: "dan edwards" <w5xz at att.net>
To: <towertalk at contesting.com>
Sent: Friday, March 20, 2009 10:44 AM
Subject: [TowerTalk] 2 & 3 el 40m Booms


> what do people use for homebrew antennas with full-size elements?
> (besides tower sections!)
>
> digging in the scrap pile at W5WMU.
>
> thanks
>
> 73 from texas, W5XZ, dan
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk