[TowerTalk] tower & antenna project questions

[Jan Wise]

	Thanks for clearing that up. By the way, that is not old! I'm old!
(Ha Ha )

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Bill Aycock
Sent: Thursday, March 11, 2010 9:50 PM
To: wisecrafter at suddenlink.net
Cc: Towertalk at contesting.com
Subject: Re: [TowerTalk] tower & antenna project questions

Thank you Jan--
I thought it was at least that old. That opinion has been disproved many 
times, which is why the ARRL took the reference out.
I have seen concrete explode, and it took a LOT of local heat to do it. On 
the occasion when I saw it, it was Rocket fuel.  The ground system described

is, essentially, an "Ufer" ground, where there is connection between the 
rebar cage and the ground system. The Army uses this system to protect 
explosive storage facilities. Successfully. I worked in one, designing 
Rockets, for 38 years.  Go to the Wikipedia and look up Ufer.
The Lightning caused steam explosion is a myth. What IS bad, and can cause 
concrete cracking, is having rebar in contact with both the ground and the 
cement at a boundary. In this case, the steel rusts, admits water, and 
cracks appear on freezing. They use Copper at the transition to stop that.
I have not seen a documented case of a Lightning-caused concrete explosion.
----- Original Message ----- 
From: "Jan Wise" <Wisecrafter at suddenlink.net>
To: "'Bill Aycock'" <billaycock at centurytel.net>
Sent: Thursday, March 11, 2010 7:31 PM
Subject: RE: [TowerTalk] tower & antenna project questions


> That came out of the ARRL Antenna Book 16th edition Copyright 1991.
> It is under bases for towers in the index.  Pp 22-9 TOWER BASES
>
> -----Original Message-----
> From: Bill Aycock [mailto:billaycock at centurytel.net]
> Sent: Thursday, March 11, 2010 5:20 PM
> To: wisecrafter at suddenlink.net; Tower and HF antenna construction topics.
> Subject: Re: [TowerTalk] tower & antenna project questions
>
> That must be an OLD handbook. Can you give me the year, chapter and page
> where this old wives tale is?  I'd like to find it in print, jut once.
> Bill--W4BSG
>
> ----- Original Message ----- 
> From: "Jan Wise" <Wisecrafter at suddenlink.net>
> To: "'Tower and HF antenna construction topics.'" 
> <towertalk at contesting.com>
> Sent: Thursday, March 11, 2010 4:22 PM
> Subject: Re: [TowerTalk] tower & antenna project questions
>
>
>>I am not sure, but I think if you look at the Hand Book It will state that
>>you do not want the tower or anything else to be grounded that goes 
>>through
>
>>concrete. The reason being that a hit from lightning
>> Will cause the concrete to explode. If I am wrong someone please let me
>> know !
>>
>
>
>
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