[TowerTalk] Lightning protection - length of

[john at kk9a.com]

At what distance from the tower will ground rods be ineffective due to
wire inductance?

John KK9A


To:	Ray Benny <rayn6vr at cableone.net>
Subject:	Re: [TowerTalk] Lightning protection - length of grounding rods
runs from tower?
From:	Chad WE9V <chad.we9v at gmail.com>
Date:	Wed, 28 Jan 2015 22:27:40 -0600


On Wed, Jan 28, 2015 at 6:37 PM, Ray Benny <rayn6vr at cableone.net> wrote:

> My question, or request for your thoughts, is it better to run 3 grounding
> wires out 40, 50 or 60 ft (8 ft ground rods about every 16 ft connected
> with bare #4 wire) or to run say 6 ground wires out, perhaps 30 - 40 ft
> outwards? I have room in all but one direction to trench out a 100 ft if
> that would be even better yet.
>

More shorter wires, not less long wires.  The long wires are higher
impedance(inductance).  More wires lowers inductance.

See page number 11, start of Chapter 2, of this PDF:
http://www.radio2way.net/Polyphaser%20Guide.pdf
Polyphaser knows what they're talking about.  The entire book is good.

Chad WE9V