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

[Tisha Hayes]

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

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"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