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1. [TowerTalk] Ground resistance (score: 1): Author: "Stone, Gary R." <Gary.Stone@va.gov>; Date: Wed, 7 Jun 2006 13:09:25 -0500; Greetings, I imagine I have missed the obvious but my question is how do you measure ground resistance? Does it take a special meter (I suspect it does). I am writing this in reference to ground rods; /archives//html/Towertalk/2006-06/msg00113.html (6,518 bytes)
2. [TowerTalk] Ground resistance (score: 1): Author: John E.Cleeve <g3jvc@jcleeve.idps.co.uk>; Date: Thu, 08 Jun 2006 14:27:23 +0100; Hello Gary, I asked the same question. The answer was that the measurement device cost around 1400 pounds sterling, so I decided to ask a company that specialised in installing lightning protection f; /archives//html/Towertalk/2006-06/msg00114.html (9,142 bytes)
3. Re: [TowerTalk] Ground resistance (score: 1): Author: "Jay Schwisow" <jay@kt5e.us>; Date: Thu, 8 Jun 2006 08:08:26 -0600; Gary, Yes, this is a special piece of equipment. A friend of mine that works for Sprint has one and has used it at my place. You can buy one at www.tessco.com. Tessco is also a great source for climb; /archives//html/Towertalk/2006-06/msg00116.html (8,521 bytes)
4. Re: [TowerTalk] Ground resistance (score: 1): Author: "Stone, Gary R." <Gary.Stone@va.gov>; Date: Thu, 8 Jun 2006 09:15:12 -0500; TT and John, Thanks John - that is very interesting. I have 9 (nine) 8 foot ground rods around the base of the tower. I do NOT have them connected with a large outer circle but may do that. I do have; /archives//html/Towertalk/2006-06/msg00118.html (11,806 bytes)
5. Re: [TowerTalk] Ground resistance (score: 1): Author: "jgroover6@concast.net" <jgroover6@comcast.net>; Date: Thu, 8 Jun 2006 11:44:47 -0400; The gold standard that power companies us is a device called a Megger. I think a company called Bindel or something close to that makes them. However, I bought an Extech 382152 ground tester kit. I t; /archives//html/Towertalk/2006-06/msg00120.html (9,598 bytes)
6. Re: [TowerTalk] Ground resistance (score: 1): Author: Roger D Johnson <n1rj@adelphia.net>; Date: Thu, 08 Jun 2006 12:36:45 -0400; This is one of these questions that comes up periodically for which there is no simple answer. First, what do you mean by "ground resistance"? Electricians and power companies are mainly interested i; /archives//html/Towertalk/2006-06/msg00121.html (8,137 bytes)
7. Re: [TowerTalk] Ground resistance (score: 1): Author: Roger D Johnson <n1rj@adelphia.net>; Date: Thu, 08 Jun 2006 13:33:51 -0400; A good site for info is: http://www.polyphaser.com/ppc_ptd_home.aspx As you will discover, the subject of lightning protection is not as simple as it first seems. There is a lot of bad info on the we; /archives//html/Towertalk/2006-06/msg00123.html (8,451 bytes)
8. Re: [TowerTalk] Ground resistance (score: 1): Author: "Stone, Gary R." <Gary.Stone@va.gov>; Date: Thu, 8 Jun 2006 11:44:59 -0500; I am speaking about this in terms of lightning protection. Gary, N5PHT This is one of these questions that comes up periodically for which there is no simple answer. First, what do you mean by "groun; /archives//html/Towertalk/2006-06/msg00124.html (9,047 bytes)
9. Re: [TowerTalk] Ground resistance (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 08 Jun 2006 10:37:25 -0700; WRONG! Earth grounding for power systems is solely for protection against lightning and other potentially destructive on the power line. Earth ground should NEVER carry current (except under a light; /archives//html/Towertalk/2006-06/msg00125.html (9,530 bytes)
10. Re: [TowerTalk] Ground resistance (score: 1): Author: Roger D Johnson <n1rj@adelphia.net>; Date: Thu, 08 Jun 2006 14:06:27 -0400; I think you are reading too much into my statements, Jim. I'm trying to keep it relatively simple for Gary until he comes up to speed. It's my understanding that most ground measurement devices use a; /archives//html/Towertalk/2006-06/msg00127.html (10,348 bytes)
11. Re: [TowerTalk] Ground resistance (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 08 Jun 2006 12:28:59 -0700; Simplicity is good only if it is CORRECT. Simplicity that is wrong leads to (or reinforces) the myriad of misconceptions about the purpose of earth connections. We've all seen posts here and elsewher; /archives//html/Towertalk/2006-06/msg00131.html (10,013 bytes)
12. Re: [TowerTalk] Ground resistance (score: 1): Author: "John E. Cleeve" <g3jvc@jcleeve.idps.co.uk>; Date: Thu, 8 Jun 2006 20:11:46 +0100; Hello Gary, Thanks for the response and information. Like you, I have been reading various mail regarding lightning protection and effective grounding....I came to the conclusion that the answer was; /archives//html/Towertalk/2006-06/msg00132.html (16,117 bytes)
13. Re: [TowerTalk] Ground resistance (score: 1): Author: Roger D Johnson <n1rj@adelphia.net>; Date: Thu, 08 Jun 2006 16:09:16 -0400; One of the problems is that "ground" means different things to different people. It's rather like using Ohms to describe resistance, reactance and impedance! Proper lightning protection involves more; /archives//html/Towertalk/2006-06/msg00133.html (9,848 bytes)
14. Re: [TowerTalk] Ground resistance (score: 1): Author: "Stone, Gary R." <Gary.Stone@va.gov>; Date: Thu, 8 Jun 2006 15:17:49 -0500; Here is the info I sent to Roger (with a drawing - but I don't think I can include attachments to TT?) Gary, N5PHT I have two LMR-400 lines coming into the shack from the tower. I also have 2 control; /archives//html/Towertalk/2006-06/msg00134.html (12,115 bytes)
15. Re: [TowerTalk] Ground resistance (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 08 Jun 2006 13:21:23 -0700; different people. Yes. Our use of the same symbol for earth and signal common has led to many serious misunderstandings. In our work on international standards with the Audio Engineering Society (AES; /archives//html/Towertalk/2006-06/msg00135.html (9,282 bytes)
16. Re: [TowerTalk] Ground resistance (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 08 Jun 2006 13:43:19 -0700; Every piece of wire connecting things together is an inductor that stands in the way of effective lightning discharge. The longer the wire, the greater the inductance. When lightning hits, is is quit; /archives//html/Towertalk/2006-06/msg00136.html (10,103 bytes)
17. Re: [TowerTalk] Ground resistance (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Thu, 08 Jun 2006 16:55:22 -0400; This is a very interesting point. My grounding situation is so imperfect - 2nd floor shack, 150-year-old house - that I have opted to disconnect every conductor at the entry panel in the second floor; /archives//html/Towertalk/2006-06/msg00137.html (9,802 bytes)
18. Re: [TowerTalk] Ground resistance (score: 1): Author: "Keith Dutson" <kdutson@sbcglobal.net>; Date: Thu, 8 Jun 2006 16:02:38 -0500; copper plates solve nothing except acting as a place to bond all the antenna ground connections together, and those connections are only effective if they are very short. These should always be used; /archives//html/Towertalk/2006-06/msg00138.html (8,843 bytes)
19. Re: [TowerTalk] Ground resistance (score: 1): Author: Roger D Johnson <n1rj@adelphia.net>; Date: Thu, 08 Jun 2006 17:09:11 -0400; That reminds me of when NY1E and I were touring KC1XX's contest station. Dick asked Matt what he did about lightning protection. Matt's response, "State Farm"! 73, Roger -- Remember the USS Liberty (; /archives//html/Towertalk/2006-06/msg00139.html (9,083 bytes)
20. Re: [TowerTalk] Ground resistance (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Thu, 8 Jun 2006 22:58:04 -0500; The purpose of the copper plate is to give a low impedance connection between all lines connected to it. (short low inductance) Unfortunately the center conductor is not at or near shield potential; /archives//html/Towertalk/2006-06/msg00145.html (11,050 bytes)

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