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Re: [TowerTalk] Lightning protection - length of grounding rodsruns from

To: Mike Fahmie <wa6zty@yahoo.com>
Subject: Re: [TowerTalk] Lightning protection - length of grounding rodsruns from tower?
From: Ray Benny <rayn6vr@cableone.net>
Date: Fri, 30 Jan 2015 10:43:26 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Now that someone mentioned the equilateral triangle, things begin to fall
in place. Eight equilateral triangles fills the circle, following their
sides and offsetting the grounds 9 ft and 21 ft as show in Chad's drawing
seems to minimize overlap. I don't mind the overlap since my soil has very
poor conductivity anyway.

Like some old timer said, a picture is worth a thousand words.

Tnx all,

Ray,
N6VR

On Fri, Jan 30, 2015 at 10:02 AM, Mike Fahmie via TowerTalk <
towertalk@contesting.com> wrote:

> An equilateral triangle has equal sides so that means that the rods on
> adjacent radials will be spaced the same as the length of the radial, ie,
> at 16' from the center, adjacent rods will be 16' apart.
> -Mike-
>
>       From: Roger (K8RI) on TT <K8RI-on-TowerTalk@tm.net>
>  To: towertalk@contesting.com
>  Sent: Friday, January 30, 2015 6:00 AM
>  Subject: Re: [TowerTalk] Lightning protection - length of grounding
> rodsruns from tower?
>
> You are also limited on more shorter runs as the distance between runs
> will have the first rod or two on adjacent runs fairly close.  The
> first rods a couple of feet out will by necessity be close.
>
> Refresh your math skills and try to do it with trig <:-))  They come
> from a common point (center of the tower.  6 radials would be 360/6, or
> 60 degrees forming the vertex of an equilateral triangle and that about
> exhausts my math abilities. So that's where my refreshing would start.
> Refreshing?  What am I saying?  I never had Trig in the first place!  I
> have a math minor without ever having taken trig and I graduated in 90.
> I never had to use a bit of it since then. So the sum of my knowledge is
> the same as before I took all those classes.  It looks good on a resume,
> but I never claimed to be any good at it.
>
> 73
>
> Roger (K8RI)
>
>
> On 1/30/2015 1:24 AM, Ray Benny wrote:
> > Thanks to all who made comments.
> >
> > My take away is to use more shorter ground rod runs from the tower, say
> 30
> > - 40 ft, than a smaller number of longer runs.
> >
> > I will see how many 30 ft radial runs I can make using 8 ft ground rods
> > while keeping 16 ft separation between the rods. Guess I could pull out a
> > drawing compass and scale the radials lengths, then measure between the
> 16
> > ft points. Boy, this make me old! Haven't done this in ages, especially
> on
> > paper...
> >
> > Ray,
> > N6VR
> >
> >
> >
> > On Thu, Jan 29, 2015 at 11:36 AM, john@kk9a.com <john@kk9a.com> wrote:
> >
> >> Less effective than what?  Two 8' ground rods 8' apart are less
> effective
> >> than a single 8' rod?
> >>
> >> John KK9A
> >>
> >>
> >> To:    "Jim Lux" <jimlux@earthlink.net>
> >> Subject:        Re: [TowerTalk] Lightning protection - length of
> grounding
> >> rodsruns from tower?
> >> From:  charlie@thegallos.com
> >> Date:  Thu, 29 Jan 2015 11:37:40 -0500
> >>
> >>
> >> I can't think of a good way to word it - except may to say a pair of
> rods
> >> closer than 2x is less effective -
> >>
> >> _______________________________________________
> >>
> >>
> >>
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>
> --
>
> 73
>
> Roger (K8RI)
>
>
> ---
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