On 10/16/14, 6:27 PM, Chris Albertson wrote:
Lightening arrestors are an important part of a protection system but just
installing some in the antenna cable is not going to help so much. You
need a system approach. If you do it right you can take a direct hit
The big problem with grounding is Ohm's Law. That is if any current flows
in a conductor that has resistance there will be a voltage across the
conductor equal to the current times the resistance. But with lightening
you can have 100,000 amps of current in a ground wire. If that wires has
0.01 ohms of resistance you have 1,000 volts above true ground on your
"ground" connector on the lightening arrestor. Your ground is no longer at
ground.
For lightning transients 1 us kind of rise times...inductance is a MUCH
bigger deal than resistance, and inductance is very weakly dependent on
conductors size and shape.
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