Re: [TowerTalk] 40 Meter Vertical Construction

[Joe Reisert <W1JR@arrl.net>]

Gordon,

One of the "rules-of-thumb" used with tubing is to overlap 2-3 times the 
diameter of the element. Therefore, 5" is great on 1.625" tubing while only 
about 2-1/2" is needed on the .875" diameter tubing. Of course, more is OK 
but from an economy and weight perspective, less is better!

73,

Joe, W1JR


At 05:17 PM 11/7/2003, Macie, Gordon wrote:
> I am building a 40 meter 4-square. I have decided to build it with aluminum
> from Texas Towers. The bottom section will be 1.625 and reduce 1/8 per
> section above that with the top peice being .875. How much do I need to
> overlap or telescope into each section for mechanical strength ??.. I am
> thinking 6 to 12 inches.
>
> Blurb below from Texas Towers web site.
> 6063-T832 Drawn Aluminum Tubing
> Typical yield strength of 40,000 psi. The chart shows all available
> telescoping sizes which are specifically designed to fit together precisely,
> making antenna construction easy, while offering professional results.
>
>
> Gordon N4LR
> n4lr@arrl.net
>
> _______________________________________________
>
> See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless 
> Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with 
> any questions and ask for Sherman, W2FLA.
>
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_______________________________________________

See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.

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