[R-390] Electro and it's sister Magnetic

[wb5uom at hughes.net]

Yes Yes... I think that inductive coupling is a huge part of the issue over
direct hits myself.
Power Lines, Telephone Lines, whether above or below ground all are little
helpers (or big helpers) in causing problems.

A direct hit to a Radio tower is something to see (as long as you are not on
it or in the equipment building) , but it is awesome to watch.

Ive seen the KTVT Tower at Cedar Hill Texas get a direct hit, I think it is
1200 foot tall. And Ive seen a 450 foot tower that I have equipment on here
in Tyler get hit too from a mile or so away.

David?WB5UOM

----- Original Message ----- 
From: "Tisha Hayes" <tisha.hayes at gmail.com>
To: <r-390 at mailman.qth.net>
Sent: Sunday, August 02, 2009 7:07 PM
Subject: [R-390] Electro and it's sister Magnetic


> We cannot forget that when a lightning strike dumps a tremendous amount of
> energy down our tower and into our grounding system it creates a terrific
> magnetic field too.
>
> Parallel conductors (like coax, equipment racks, even ground conductors
from
> the bulkhead entrance plate down to the ground plane) all get a big kick
> from magnetic coupling. This can become "secondary windings" on our
gigantic
> transformer with the antenna tower as the primary winding.
>
> Figure that a lightning strike managed to jump a distance of thousands of
> feet to the tower. That aluminum rain gutter on your shack can suddenly
> throw an arc to ground (or you or the electrical outlet behind the wall).
>
> If you have ever seen the "can crusher" experiments
> http://tesladownunder.com/CanCrushing.htm it is a great example of the
> physical damages that can be done to your equipment.
>
> -- 
> Ms. Tisha Hayes
>
> ----------------
> "I will not recant the truth. I am corn, not chaff; I will not be blown
away
> with the wind or burst by the flail. I will survive both."
> -Walter Milne, 1558
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