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[TowerTalk] Lightning 'porcupines' & rods

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Subject: [TowerTalk] Lightning 'porcupines' & rods
From: (Merv Schweigert)
Date: Thu, 19 Aug 1999 18:47:48 -0500
Cannot comment from experience, but noticed when on trips to
China that al parts of the country use very large porcupines there,
they have them on all towers, high rise buildings have huge ones
and smaller building and electrical plants have them on towers
or pipes extending far above the surrounding structures, when ask
about them , the comment was that they work or else they
would not be everywhere..  Dont see that use in the states so
dunno.  FYI  Merv K9FD

>Three broadcast towers I deal with - two are 300' and one is 500' - are set
>up with commercially sold "porcupines" "drained" by a heavy copper cable,
>which leads to a 3" copper pipe (perforated) that's sunk a good 12' into
>earth. NaCl nuggets fill the pipe, and the leach is supposed to enhance
>ground conductivity.
> The  2.5 ft. dia. spherical broom of some 100 stainless steel, pointed
>bicycle spokes is cadwelded into a cup on top of a 5/8" stainless rod
>clamped so as  to extend above the top beacon assembly.
>Larry Kozal  K8PUJ
>Because of the abscence of verifiable strikes on the tower, ie, no antenna,
>feed, or active device damage for years, we like to think the concept is
>-----Original Message-----
>From: Brian Smithson <>
>To: <>
To: <>
>Date: Wednesday, August 18, 1999 8:21 AM
>Subject: [TowerTalk] Lightning 'porcupines' & rods
>>I've seen several posts in the past praising the virtues
>>of 'porcupines' to 'drain off charge' before a strike can
>>occur. I've also seen at least as many claim it is all
>>bunk. I must admit it seems reasonable, but not if a
>>lightning rod 'attracts' strikes. I have no background
>>here - just a software guy! Does anyone know where
>>I can find out about any studies, etc. to what the
>>scoop is?
>>-Brian n8wrl
>>FAQ on WWW:     
>>Administrative requests:
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>Administrative requests:

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