|To:||Frank Donovan <email@example.com>|
|Subject:||Re: [TowerTalk] Station Ground|
|From:||Gary Schafer <firstname.lastname@example.org>|
|Date:||Fri, 14 Jan 2005 22:25:33 -0500|
Frank Donovan wrote:
The modern design practice is to bond all RF cables, rotator cables and control cables to a common grounding "window" at the entry point into the home. All other cables (AC power, telephone, cable TV, satellite, etc) penetrating the wall of the building should be bonded to the grounding window. While a heavy ground wire could be run from the grounding window to the station equipment bus bar and then to each station equipment, it is likely to have such high impedance that it is highly unlikely to perform any useful function.
With a proper "grounding window" using a buss bar to connect equipment to can actually be a detriment. It is best to run individual ground lines from each piece of equipment separately to the ground window.
With a common buss bar you have ground loops between pieces of equipment. If a surge, lightning etc. should get through to one piece of equipment it will hopefully exit via the ground to the ground window.
If there is a common buss bar the surge can enter another piece of equipment and go through it via the ground connection on it's way to ground. The ground lead from the buss bar will always have some impedance so it will be somewhat above ground with a surge.
With individual ground leads to the ground window there is no loop through other equipment. Not always doable but it is the proper way.
73 Gary K4FMX
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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