What importance does inductance have in grounding a roof mounted antenna? I
would think impedance is the prime concern.
Keith NM5G
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Red
Sent: Wednesday, August 18, 2004 12:31 PM
To: David Giuliani; TowerTalk
Subject: Re: [TowerTalk] ground strap width: 3" vs 6"...
Hi, David and all;
3-5 parallel copper wires spaced 2" or more is as good as copper strap.
Compare the cost to decide. Greater separation and more wires will further
reduce the inductance, which is what you are accomplishing with a wide strap
instead of a cylindrical wire. I see no problem running under the roof as
long as you maintain ample distance from wiring, plumbing, or any other
conductor.
73 de WOØW
David Giuliani wrote:
>I am installing ground straps between a garage roof mounted tower (at h=30'
>above ground), and a grounding system consisting of a perimeter loop of
>#2 ground wire, multiple ground rods, and several Ufer connections to
>the rebar in the concrete pads surrounding the garage, and a 50'
>section of copper strap buried horizontally at 1-2' below the surface.
>Copper strap will be used in two places, each side of the garage, to
>run between the tower base and the grounding system, about 50' each
>run. We live in a low lightning strike region.
>
>My supplier carries only 6" wide 24 gauge copper strap. Not cheap, of
>course, but it's going to serve me a long time. I'm wondering about:
>
>- using the 6" as is, or slitting it into 3" sections. About half the
>inductance, of course, but I'm wondering if it's below the point of
>diminishing protection to go beyond 3". I've seen 1.5", 3", and 6"
>strap offered for lightning protection.
>
>- wisdom of placing the strapping inside the attic, and under ~ 6' of
>shingles on the way to the ground, to make it more eyeball friendly for
>the XYL. Most of the run will be inspectable, e.g. after a lightning
strike.
>
>Opinions?
>
>David, WA6PXX, Mercer Island, WA
>
>
>-----------------------------------------------------------------------
>-
>
>_______________________________________________
>
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>
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>
_______________________________________________
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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_______________________________________________
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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