[BULK] - RE: [TowerTalk] ground strap width: 3" vs 6"...

[Keith Dutson]

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 at jmr.com] 
Sent: Wednesday, August 18, 2004 12:37 PM
To: 'keith at 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 at 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 at contesting.com 
> [mailto:towertalk-bounces at 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.
> >
> >_______________________________________________
> >TowerTalk mailing list
> >TowerTalk at 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.
> 
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at 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.
> 
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk