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Re: [TowerTalk] DX Engineering 66-Foot Vertical?

To: "Roger (K8RI)" <K8RI-on-TowerTalk@tm.net>
Subject: Re: [TowerTalk] DX Engineering 66-Foot Vertical?
From: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Tue, 17 Mar 2009 05:50:00 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
> What I worry about in that case is oscillation under the right wind 
> conditions.

> Roger (K8RI)

After much experimenting, I have learned something about the oscillation
problem:

1.  The worst design is a uniform diameter vertical guyed at equal
intervals.  This is somewhat obvious from physics.

2.  Tapering the diameters is very helpful.

3.  For really flimsy verticals, I guy every 15 feet

4.  Oscillation may not cause immediate failures, but instead
the cumulative effects of fatigue will eventually reach the breaking
point.

Rick N6RK
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