TT:
I found it - how I (painlessly) ordered the MIL HDBK on grounding. The
Naval Pubs and Forms Center that Art Boyars mentioned is closed. The doc.,
MIL-HDBK-419A, "Grounding, Bonding and Shielding, etc...", can still be
ordered by fax on company letterhead from 215-697-1462. (It works, or at
least a fax machine answers the phone.) They want your name and mailing
address to be included (duh!)
73 de
Gene Smar AD3F
-----Original Message-----
From: Jimmy Weierich <kg2au@stny.rr.com>
To: towertalk@contesting.com <towertalk@contesting.com>
To: <towertalk@contesting.com>
Date: Monday, October 11, 1999 10:29 PM
Subject: [TowerTalk] Military Grounding Handbook
>
>This manual is also available online as an Adobe PDF file. Go to
>http://astimage.daps.dla.mil/quicksearch/ and search for
>MIL-HDBK-419A in the "Document ID" field.
>
>Beware, it is a 9.8 MB file. It took about two minutes to download
>with a cable modem, slower connections will take considerably longer!
>(The internet is the only place I run high power.)
>
>It includes both Volume 1, Basic Theory, and Volume 2, Applications.
>However, Volume 2 appears first in the PDF file.
>
>Jimmy
>
>>Brian (and TT):
>>
>> The address and phone number for the Mil Hdbk are:
>>
>>Commanding Officer
>>Naval Publications and Forms Center
>>5801 Tabor Ave.
>>Phila., PA 19120
>>
>> The phone number in the HDBK, 215-697-3321, rings with no answer. So
>>you might have to call around via Directory Assistance for another listing
>>in the Pubs and Forms Center before you can get a human to fill the order
>>over the phone (as I did earlier this year but I didn't save the number
that
>>worked).
>>
>>
>>73 de
>>Gene Smar AD3F
>>-----Original Message-----
>>From: Eric Gustafson <n7cl@mmsi.com>
>>To: towertalk@contesting.com <towertalk@contesting.com>;
>>brian_smithson@vds.com <brian_smithson@vds.com>
To: <towertalk@contesting.com>
>>Date: Monday, October 11, 1999 11:59 AM
>>Subject: Re: [TowerTalk] newbie, Installing a 80' crank up
>>
>>
>> >
>> >
>> >Hi Brian,
>> >
>> >I don't think you are asking for trouble per se. But you are
>> >asking for a requirement that you exercise somewhat more care in
>> >the design of the ground system.
>> >
>> >Only you know what the value and vulnerability of the stuff in
>> >and around the barn is likely to be. If it is an abandoned
>> >facility which is unlikely to have animals or personnel in or
>> >near it during a storm, that is one set of circumstances. If it
>> >is an active dairy operation which is likely to have people and
>> >livestock working in the vicinity and valuable production
>> >equipment in operation, that is another.
>> >
>> >The "rule of thumb is ok if no lightning protection effort can be
>> >tolerated. But it doesn't mean that a tower cannot be safely
>> >located adjacent to a tall conductive antenna structure.
>> >
>> >Buildings located next to towers are routinely lightning
>> >protected to the degree that the radio station inside the
>> >building can and does operate right through a direct hit on the
>> >antenna structure without any damage to the building, equipment,
>> >or personnel in the vicinity or even any interruption in service.
>> >There is an FM transmitter south of town here (Tucson, AZ) that
>> >gets hit an average of twice a day during our monsoon season.
>> >Probably, the safest possible place in the entire valley for a
>> >person to be during a summer thunderstorm here is inside that
>> >transmitter building. It is all a matter of how much attention
>> >is paid to the lightning protection system requirements.
>> >
>> >Start with the PolyPhaser book "Grounds for Lightning and EMP
>> >Protection". And get a (free) copy of MIL-HDBK-419A Vols. I and
>> >II. This is by far the best reference on this subject I have
>> >ever seen. It has both the theoretical basis and practical
>> >instruction relating to lightning protection. Do some reading.
>> >Don't stop until you understand the concept of "step potential"
>> >and how to control its magnitude. Then decide on where you want
>> >your tower based on the ground system effort required for your
>> >situation and what you are willing or financially able to do.
>> >
>> >73, Eric N7CL
>
>Jimmy, KG2AU <kg2au@stny.rr.com>
>
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