July meeting

[Mike O'Dell]

the pole needs a good ground in any event,
but there are two distinct problems
one can chose to address

(1) is dissipating the ground charge before it flashes over
into a strike

and

(2) trying to moderate ground-bounce when a flash-over happens

the corona brush addresses the first (1)

the grounding system addresses the second (2)

If (1) is successful, you don't need to worry about (2)

Prof. Murphy, however, suggests that such trust might be misplaced.

	cheers,
	-mo

PS - the other argument is that if (2) works reliably,
you don't need to worry about prevention (1).
see last comment above.


On 6/23/11 8:27 PM, Chip Fetrow wrote:
> And, at MINIMUM, three 6-10 foot long ground rods, about five feet out
> from the pole, spaced 120 degrees apart. The pole should be connected to
> the ground rods by 00 copper (minimum). Cad Welding would be a good
> idea, but I believe I would bolt to the pole.
>
> People might disagree with this, but I would put a ring of 00 copper
> connecting those ground rods, then run 00 copper back to the house
> ground rod -- outside only. Of course, all the utilities should be
> connected to that common ground rod. The idea is that the entire
> facility should rise in Voltage together without the current through the
> ground causing large Voltage differences.
>
> --chip
>
>> Message: 1
>> Date: Wed, 22 Jun 2011 13:42:24 -0400
>> From: Mike O'Dell <mo at 131.ccr.org>
>> To: "Bob Rice, KG4RRN" <kg4rrn at yahoo.com>
>>
>> you might consider adding a corona brush to the top
>> of the flagpole - all the points really do help drain away the charge,
>> which is what lightning rods really do - help dissipate the
>> ground charge before it gets high enough to flash-up a leader.
>>
>> -mo
>
>>> Message: 5
>>> Date: Wed, 22 Jun 2011 02:24:10 -0700 (PDT)
>>> From: "Bob Rice, KG4RRN" <kg4rrn at yahoo.com>
>>> To: Paul L Rinaldo <prinaldo at cox.net>, tacos at amrad.org
>>> Subject: Re: July meeting
>>> [...]
>>> We also installed a new Lightning Arrestor for the house-its a 20
>>> foot aluminum flagpole.
>>> Thats the news, thanks for the memories....
>>>
>>> Bob Rice, KG4RRN
>>> kg4rrn at arrl.net
>
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