Is the 1987 version the latest issue available for free? ______________________ Clay Autery, KY5G MONTAC Enterprises (318) 518-1389
On 8/6/2016 8:46 AM, Glenn Little WB4UIV wrote: > Cone of protection is addressed. > Volume 1 is theory, volume 2 is application. > The military requires 1/0 cable exterior to the building, commercial > practice is #2AWG. > Ground rod spacing is address. > > Overall a very good reference based on practical experience and backed > with theory. > > 73 > Glenn > WB4UIV > > > On 8/6/2016 1:19 AM, Bill Hawkins wrote: >> Hi Glenn, >> >> Your advice is excellent. >> >> Seems like every time we have a lightning discussion there is no >> distinction between an EMP and a direct hit. >> >> I started work in 1960 at a blasting cap plant in upstate New York. The >> powder magazines were protected by tall masts according to the "cone of >> protection" theory. The angle of the cone varied between 45 and 60 >> degrees. The earth ground resistance of the mast was measured by a >> hand-cranked device that looked like a megger but read earth resistance >> to less than a tenth of an ohm. Had the lightning but never lost a >> magazine. >> >> You say MIL-HDBK-419 covers EMP. Does it also cover cone of protection >> for direct hits? >> >> I was fascinated by the idea that a simple capacitor discharge into an >> inductor could be greatly enhanced by reducing the diameter of the >> inductor with a conventional explosive, described in one of Stephen >> Coonts' books, if my failing memory recalls correctly. And so I learned >> what I could about EMP. Never built anything, just interesting behavior. >> >> Best regards, >> Bill Hawkins >> >> >> -----Original Message----- >> From: time-nuts [mailto:[email protected]] On Behalf Of Glenn >> Little WB4UIV >> Sent: Friday, August 05, 2016 9:47 PM >> To: Discussion of precise time and frequency measurement >> Subject: Re: [time-nuts]GPS antenna selection - lightning >> >> A very good reference for EMP protection is MIL-HDBK-419. >> This is downloadable for a number of web sources. >> It is about 600 pages and is in two volumes. >> This discusses a number of different sources of EMP such as nuclear and >> lightning. >> A lot is for protection of military industrial complexes, but, there is >> a lot that pertains to us. >> >> I worked for a military complex that assembled nuclear missiles. >> The site was built to this handbook specs. >> We had no EMP related damage at the site. >> >> Number one rule, bond all grounds together. If something on your >> property takes a hit, you want everything on your property to elevate to >> the same level and the same rate. >> If you have multiple, non bonded grounds, there is a different reference >> for each ground. This is a major source for disaster. >> >> I spent seven years in lightning mitigation. I was told by professionals >> that I was wrong. The third time that their tower was struck, destroying >> all of the lights and attached equipment, they followed my >> recommendations. That was ten years ago. The three hits were within four >> months of each other. The site has been free of destructive hits since >> then. >> >> 73 >> Glenn >> WB4UIV >> >> >> >> > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
