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

[Mike Fahmie via TowerTalk]

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 at tm.net>
 To: towertalk at 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 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 -
>>
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk at contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk


-- 

73

Roger (K8RI)


---
This email has been checked for viruses by Avast antivirus software.
http://www.avast.com




_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk at contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk