What frequency? I have always looked at lightning as a low/no frequency
flow of electrons, i.e. like a DC current.
Keith NM5G
-----Original Message-----
From: Steve Katz [mailto:stevek@jmr.com]
Sent: Wednesday, August 18, 2004 12:37 PM
To: 'keith@dutson.net'; TowerTalk
Subject: RE: [BULK] - RE: [TowerTalk] ground strap width: 3" vs 6"...
Isn't most impedance in a length of copper inductance? The resistive
component should be very, very small.....-WB2WIK/6
> -----Original Message-----
> From: Keith Dutson [SMTP:kjdutson@earthlink.net]
> Sent: Wednesday, August 18, 2004 10:42 AM
> To: TowerTalk
> Subject: [BULK] - RE: [TowerTalk] ground strap width: 3" vs 6"...
>
> 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
> >
> >
> >---------------------------------------------------------------------
> >--
> >-
> >
> >_______________________________________________
> >
> >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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> >http://lists.contesting.com/mailman/listinfo/towertalk
> >
> >
> _______________________________________________
>
> 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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> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
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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