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@att.net>
To: <towertalk@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
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