[TowerTalk] Lightning protection - length of grounding rodsruns from tower?

[Roger (K8RI) on TT]

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 at kk9a.com <john at 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 at earthlink.net>
>> Subject:        Re: [TowerTalk] Lightning protection - length of grounding
>> rodsruns from tower?
>> From:   charlie at 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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