On Fri, 14 Jan 2005 14:37:52 -0800 (PST), N6KJ wrote:
>Why do you need "beefy" connections from bus-bar
>to ground when you use much smaller wire
>connecting the equipment to the bus-bar?
It's all part of fooling ourselves about the basic physics. The
impedance of a conductor at RF is FAR more dependent on its
INDUCTANCE than upon its resistance. So the only value of that
"beefy" wire is that it might take a microsecond longer to melt in
the case of a direct lightning hit. The smart money is on wide
copper strap, not braid, for lower inductance and longer life.
There's a discussion of some of this in a power and grounding white
paper on my business's website.
Jim Brown K9YC
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.
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