Just a follow up point. If the cloud and the comb of points at the top
is able to source 300 Amps via something like corona, it _might_ need
the support of a low impedance to ground in the ground system....depends
on the "equivelant circuit" of cloud, air, corona, ground, etc.
jeff millar wrote:
While visiting Chuck, WA1EKV and looking at his 100 Ft tower on a hill
with a comb of sharp points on top and 3 large ground leads at the
bottom, he told me that he once heard hissing from the top of the
tower during a time of dark clouds. He then measured the current in
one of the ground lines with a clip-on DC ammeter and found 100
Amps....implying a sustained 300 Amps total bleeding from the cloud to
ground.
I don't know if thats enough to bleed off the charge and prevent a
strike. It's just an anecdotal data point.
jeff, wa1hco
Keith Dutson wrote:
My "gradually and constantly bleeding off the charge" scenario takes
place
before that, before the storm arrives.
I don't get it. Exactly what is bleeding off before the storm arrives?
Keith
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Jerry Keller
Sent: Tuesday, July 06, 2004 10:25 PM
To: Tom Rauch
Cc: (Reflector) TowerTalk; ke3q@msn.com
Subject: Re: [TowerTalk] Lighting
OK, one more try! Your example describes the cloud as already over the
tower. My "gradually and constantly bleeding off the charge" scenario
takes
place before that, before the storm arrives. In my scenario, the
tower area
rarely gets enough charge built up to be attractive. When the stormcloud
arrives, the area around the tower is already "discharged", maybe
even to a
greater degree than other surrounding areas, so it looks less
attractive to
the charge in the cloud. That's what I call a sort of "prevention",
but it's
really just making the tower a less likely target. <snip>
_______________________________________________
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_______________________________________________
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any questions and ask for Sherman, W2FLA.
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_______________________________________________
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