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221. Re: [TowerTalk] Porcupines and other wives tales (score: 1)
Author: "Keith Dutson" <kdutson@sbcglobal.net>
Date: Wed, 5 Jul 2006 10:46:16 -0500
I think the timing and dynamics of a strike are not that well understood. Little of what has been published is based on actual strike measurements but rather on "triggered" strikes using rockets and
/archives//html/Towertalk/2006-07/msg00119.html (9,716 bytes)

222. Re: [TowerTalk] Porcupines and other wives tales (score: 1)
Author: "Keith Dutson" <kdutson@sbcglobal.net>
Date: Wed, 5 Jul 2006 13:21:55 -0500
Isn't there a problem getting accurate measurements of natural strikes without damaging the equipment? there's a lot of "untriggered" stroke data from places like the Empire State Bldg, Lake Lugano,
/archives//html/Towertalk/2006-07/msg00129.html (9,094 bytes)

223. Re: [TowerTalk] Porcupines and other wives tales (score: 1)
Author: "Keith Dutson" <kdutson@sbcglobal.net>
Date: Wed, 5 Jul 2006 16:49:17 -0500
To each his own theory. Yours sounds as plausible as the rest. 73, Keith NM5G KeithYour statement below the excerpt from Jim, (below) is NOT true. It is not a matter of bleeding off the entire charge
/archives//html/Towertalk/2006-07/msg00134.html (9,503 bytes)

224. Re: [TowerTalk] Soldering Ground Connections (score: 1)
Author: "Keith Dutson" <kdutson@sbcglobal.net>
Date: Thu, 6 Jul 2006 11:25:01 -0500
Why would the heat at the connection be any more than at any other point in the ground system. Or are you assuming the impedance of the connection would cause more heat at the joint? Reason I ask is
/archives//html/Towertalk/2006-07/msg00167.html (8,315 bytes)

225. Re: [TowerTalk] Porcupines and other wives tales (score: 1)
Author: "Keith Dutson" <kdutson@sbcglobal.net>
Date: Thu, 6 Jul 2006 19:06:06 -0500
Judge for yourself the effect of cosmic rays on strikes: http://www.scienceforpeople.com/Essays/electrifying.htm 73, Keith NM5G Actually if you read some of the old literature about radioactive tips,
/archives//html/Towertalk/2006-07/msg00186.html (15,629 bytes)

226. Re: [TowerTalk] Rabbits Foot (score: 1)
Author: "Keith Dutson" <kdutson@sbcglobal.net>
Date: Fri, 7 Jul 2006 08:57:09 -0500
Nick, You have waaaaaaay too much time on your hands. I have several projects associated with my new tower/antenna farm that you could work on. <grin> 73, Keith NM5G Gary, Your claims about your rabb
/archives//html/Towertalk/2006-07/msg00199.html (9,302 bytes)

227. [TowerTalk] Yet Another Lightning Strike (score: 1)
Author: "Keith Dutson" <kdutson@sbcglobal.net>
Date: Sat, 8 Jul 2006 17:01:32 -0500
This morning I was with the NARS (Northwest Amateur Radio Society) breakfast group that meets at Denny's in northwest Houston every Saturday. George Edwards K5VUU showed up a bit later than usual. He
/archives//html/Towertalk/2006-07/msg00246.html (9,144 bytes)

228. Re: [TowerTalk] Yet Another Lightning Strike (score: 1)
Author: "Keith Dutson" <kdutson@sbcglobal.net>
Date: Sat, 8 Jul 2006 17:43:54 -0500
Slight correction. This happened Wednesday, not Thursday. BTW, if anyone is wondering why I posted at this time while the IARU is in full swing, it's because I currently have a large thunderstorm par
/archives//html/Towertalk/2006-07/msg00247.html (10,084 bytes)

229. Re: [TowerTalk] generators/transfer switches etc Re:YetAnotherLightning Strike (score: 1)
Author: "Keith Dutson" <kdutson@sbcglobal.net>
Date: Sun, 9 Jul 2006 11:58:17 -0500
I had a local electrical contractor come out to estimate the cost of backup power for the house, shack and barn. Each has a 200 amp breaker panel. I have one 500 gal propane tank for the house and an
/archives//html/Towertalk/2006-07/msg00273.html (13,275 bytes)

230. Re: [TowerTalk] Grounding (score: 1)
Author: "Keith Dutson" <kdutson@sbcglobal.net>
Date: Mon, 10 Jul 2006 15:07:33 -0500
Replace that braid a soon as possible. Your next tower strike will be less likely to cause damage. I am also using braid on my tower and have a similar "to-do" list backlog. I have obtained a roll of
/archives//html/Towertalk/2006-07/msg00309.html (9,098 bytes)

231. Re: [TowerTalk] Grounding (score: 1)
Author: "Keith Dutson" <kdutson@sbcglobal.net>
Date: Mon, 10 Jul 2006 15:39:20 -0500
Can copper strap be connected to a ground rod using Cadweld? 73, Keith NM5G [snip] Where possible, use copper strap. It offers lower inductance than wire and due to skin effect is much more likley to
/archives//html/Towertalk/2006-07/msg00311.html (7,669 bytes)

232. Re: [TowerTalk] CATV & Phone grounds (score: 1)
Author: "Keith Dutson" <kdutson@sbcglobal.net>
Date: Tue, 11 Jul 2006 14:29:33 -0500
Rather than thinking of lightning as an electrical current flowing from ground to cloud or vice versa, I find it more interesting to think about what it is composed of: plasma. The free electrons and
/archives//html/Towertalk/2006-07/msg00347.html (10,357 bytes)

233. Re: [TowerTalk] CATV & Phone grounds (score: 1)
Author: "Keith Dutson" <kdutson@sbcglobal.net>
Date: Tue, 11 Jul 2006 16:32:50 -0500
Excellent explanation Roger. Thanks. BTW, the surface of the sun is something like 10,000 deg K. I think the air next to lightning plasma is about 30,000 deg K. 73, Keith NM5G Plasma can be created w
/archives//html/Towertalk/2006-07/msg00363.html (14,327 bytes)

234. Re: [TowerTalk] [Amps] transformers (score: 1)
Author: "Keith Dutson" <kdutson@sbcglobal.net>
Date: Mon, 17 Jul 2006 16:27:21 -0500
I had an L4B that put out 1700W PEP as measured by an Alpha 4510 wattmeter using 150 watts drive as read on the exciter meter. The anode voltage was about 2500 as read on the L4B meter. Also, the gri
/archives//html/Towertalk/2006-07/msg00609.html (7,466 bytes)

235. Re: [TowerTalk] Fw: Towers and Sea Birds (score: 1)
Author: "Keith Dutson" <kdutson@sbcglobal.net>
Date: Mon, 24 Jul 2006 20:56:02 -0500
I have heard of rubber bullets. 73, Keith NM5G BAD IDEA. Thinking about it, the acceleration will likely cause the rubber to expand and "jam" in the barrel just like it was plugged with mud or some o
/archives//html/Towertalk/2006-07/msg00746.html (10,856 bytes)

236. Re: [TowerTalk]Cadwelding = "alominot&eacute;rmica" (score: 1)
Author: "Keith Dutson" <kdutson@sbcglobal.net>
Date: Thu, 27 Jul 2006 14:41:06 -0500
the resistance of braided cable. I believe it's impedance that is increased. 73, Keith NM5G Stranded wire or cable is acceptable. Braided cable is not acceptable. As skin effect forces current to co
/archives//html/Towertalk/2006-07/msg00820.html (9,754 bytes)

237. Re: [TowerTalk] concrete forms (score: 1)
Author: "Keith Dutson" <kdutson@sbcglobal.net>
Date: Mon, 31 Jul 2006 14:34:26 -0500
I would try to avoid mixing on site. That is a BIG job and will be difficult to manage. You should pour one entire base within about an hour or two to ensure a monolithic cure. In my part of the worl
/archives//html/Towertalk/2006-07/msg00934.html (11,099 bytes)

238. Re: [TowerTalk] New stuff (score: 1)
Author: "Keith Dutson" <kdutson@sbcglobal.net>
Date: Tue, 1 Aug 2006 08:05:11 -0500
Do you know the shipping weight? 73, Keith NM5G rotators. They had a couple of those set up in Dayton. They make the TIC rotators look like little toys! They look like they could rotate a house. 73,
/archives//html/Towertalk/2006-08/msg00007.html (7,206 bytes)

239. Re: [TowerTalk] RFI Radius vs Ant Height (score: 1)
Author: "Keith Dutson" <kdutson@sbcglobal.net>
Date: Thu, 3 Aug 2006 10:03:10 -0500
I am wondering if it is the height or the more efficient antenna(s), or both. 73, Keith NM5G --Original Message-- From: towertalk-bounces@contesting.com [mailto:towertalk-bounces@contesting.com] On B
/archives//html/Towertalk/2006-08/msg00083.html (12,999 bytes)

240. Re: [TowerTalk] 30m Dipole (score: 1)
Author: "Keith Dutson" <kdutson@sbcglobal.net>
Date: Thu, 3 Aug 2006 15:49:52 -0500
Essentially identical. -- Are you making some assumptions here? What is I have a perfectly resonant coax fed dipole at 3850 KHz at 140 feet and run 200 watts CW. Now compare this to a 30 foot long p
/archives//html/Towertalk/2006-08/msg00095.html (8,074 bytes)


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