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Re: [TowerTalk] sorry for multiple mails, but had another

To: "A TOWER TALK GROUP" <towertalk@contesting.com>
Subject: Re: [TowerTalk] sorry for multiple mails, but had another
From: "Its from Onion" <aredandgold@msn.com>
Date: Sun, 14 Dec 2008 22:26:46 -0600
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
When thinking about antenna design one should look at the people who have a 
working, COMMERCIAL, money making system that works.  Go look at a AM broadcast 
tower in your area.  Ask for a tour from an ENGINEER there.

Almost guarantee you will find a tower that is pin mounted.   Why, you ask?  
That is the way towers are made to be installed.  (IMHO of course) This is the 
only way a tower can twist and flex, and believe it or not a tower must move to 
be strong.  Climb a tower past the 500 foot mark and feel how much it moves in 
a bit of wind.

Granted, its EASIER to stob a section in the ground and climb, stand and hang 
your antenna creations on.  Yet know this, anything in the wind oscillates.  
From bridges to skyscrapers. It is measurable less stress on the tower when it 
can twist and move in the wind.

For ya'll that need some fancy words, try these: dynamic torque loading of the 
antenna, K-factor computations for overpowering horizontal load vector limits.

Also read Electronics Industry Association Structural Standards for Steel 
Antenna Tower and Antenna Supporting Structures - EIA/TIA-222-E.

ALL I'M SAYING IS don't disregard pin mounted tower because you don't or wont 
understand them.  Once you have it installed, it really is the best way.  Never 
have to worry about the legs filling with water and bursting again to boot.

de KE4VYN
Lee
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