To: | "reflector -tower" <towertalk@contesting.com> |
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Subject: | RE: [TowerTalk] Static, Lightening, and protection |
From: | "David Robbins K1TTT" <k1ttt@arrl.net> |
Date: | Tue, 23 Mar 2004 23:46:59 -0000 |
List-post: | <mailto:towertalk@contesting.com> |
> > The "rules" seem to be like this: > If you want to create "umbrella lightning repellent" protection situation, > the tower should be as high as possible. Roughly it will protect > hemisphere with > radius of the tower. The more common 'rule' is that a tower will protect a circle roughly equal to its height by attracting lightning to itself from the area. Larger or smaller distances are claimed by some authors. The effect is dependent on total height and the peak stroke current among other variables. Low current strokes are known to 'sneak' in the sides and actually hit the sides of buildings and towers instead of the top. This is because the streamers from the ground structures are shorter and the attraction of the opposite charges on the structure pulls the leader closer as it comes down. High current strokes are less affected by the structures and the streamers are much longer going up to meet the leader. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.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. _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk |
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