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21. Re: [TowerTalk] Ground resistance (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Thu, 8 Jun 2006 23:05:52 -0500; Connecting ground rods in a circle does no good. Lightning will tend to flow in a straight line. If it is coming down a leg of the tower to a ground rod it will follow that line out away from the tow; /archives//html/Towertalk/2006-06/msg00146.html (10,536 bytes)
22. Re: [TowerTalk] Ground resistance (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 08 Jun 2006 22:49:48 -0700; Huh? I suggest you study Ott's discussion on the nature of the field inside a circular shield. Huh? For any coax that your or I would use on a transmitting antenna, this happens BELOW a few kHz. Abov; /archives//html/Towertalk/2006-06/msg00148.html (10,224 bytes)
23. [TowerTalk] Ground Resistance (score: 1): Author: John Cowan <w0tmm@yahoo.com>; Date: Tue, 8 Aug 2006 15:08:18 -0700 (PDT); I have followed the posts on radials and ground resistance for some time. Is there any simple way to measure the impedance of the ground radial system as you install them to know when you have enough; /archives//html/Towertalk/2006-08/msg00210.html (7,326 bytes)
24. Re: [TowerTalk] Ground Resistance (score: 1): Author: "David Robbins K1TTT" <k1ttt@arrl.net>; Date: Tue, 8 Aug 2006 22:25:38 -0000; Way, yes... simple, not really. There are meters made for measuring ground system resistance, but they rely on either a very good reference ground nearby, or a couple of rods spaced the right distanc; /archives//html/Towertalk/2006-08/msg00211.html (9,248 bytes)
25. Re: [TowerTalk] Ground Resistance (score: 1): Author: "Travis W. Pederson" <n5tp@verizon.net>; Date: Tue, 08 Aug 2006 17:43:36 -0500; The instrument is called a Megger, and there is a writeup here on ground resistance measurements: ftp://bama.sbc.edu/downloads/megger/biddle/biddle%20-%20ground%20resistance% 20testing%20-%20Megger.p; /archives//html/Towertalk/2006-08/msg00212.html (9,800 bytes)
26. Re: [TowerTalk] Ground Resistance (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 08 Aug 2006 22:40:03 -0700; Yes. These testers are attempting to measure the resistance of the path to "earth" at frequencies near DC. This may be repeatable, but it is of limited value for quantifying the effectiveness of a gr; /archives//html/Towertalk/2006-08/msg00227.html (8,508 bytes)
27. Re: [TowerTalk] Ground resistance (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Wed, 09 Aug 2006 07:29:37 -0400; John asked: "Is there any simple way to measure the impedance of the ground radial system as you install them to know when you have enough of them in the ground?" Others suggested using a Megger or H; /archives//html/Towertalk/2006-08/msg00232.html (9,559 bytes)
28. [TowerTalk] Ground Resistance (score: 1): Author: kb9cry@comcast.net (Phil Camera); Date: Wed, 09 Aug 2006 13:19:14 +0000; Both Biddle and Fluke make the meters used to test earth resistance. The best way is to use the Fall of Potential method. Both of these manufacturers' websites have info on their meters and the testi; /archives//html/Towertalk/2006-08/msg00233.html (7,690 bytes)
29. Re: [TowerTalk] Ground resistance (score: 1): Author: "Keith Dutson" <kdutson@sbcglobal.net>; Date: Wed, 9 Aug 2006 08:50:16 -0500; It seems to be well known that planting an antenna over salty water will greatly enhance radiation. Is this advantage in the near or far field, or both. Would installing radials under a tower with ho; /archives//html/Towertalk/2006-08/msg00238.html (10,579 bytes)
30. Re: [TowerTalk] Ground Resistance (score: 1): Author: "hasan schiers" <schiers@netins.net>; Date: Wed, 9 Aug 2006 09:20:27 -0500; Yes, it can be quite easy...not for precision but for "effectiveness". Forget the megger...other than an intellectual exercise, it will tell you nothing about the effectiveness of your radial field f; /archives//html/Towertalk/2006-08/msg00239.html (14,687 bytes)
31. Re: [TowerTalk] Ground resistance (score: 1): Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>; Date: Wed, 9 Aug 2006 10:34:09 -0400; With regard to perfect ground/saltwater verticals are affected much more than horizontals. The pattern of a horizontal dipole over usual soil and over saltwater isn't very different. Once you're up o; /archives//html/Towertalk/2006-08/msg00240.html (9,178 bytes)
32. Re: [TowerTalk] Ground Resistance (score: 1): Author: Bill Turner <dezrat@copper.net>; Date: Wed, 09 Aug 2006 09:49:37 -0700; ORIGINAL MESSAGE: -- REPLY SEPARATOR -- Here's the method I use with an SWR analyzer such as the MFJ-259 or similar: Understand that a 1/4 wave vertical over a "perfect" ground will measure a feedpoi; /archives//html/Towertalk/2006-08/msg00251.html (9,297 bytes)
33. Re: [TowerTalk] Ground Resistance (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Sun, 13 Aug 2006 21:19:48 -0700; And, of course, such a meter would measure at some frequency OTHER than the HF frequency you're actually interested in. I suppose one could do something like measure the received signal strength from; /archives//html/Towertalk/2006-08/msg00382.html (9,328 bytes)
34. Re: [TowerTalk] Ground Resistance (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Mon, 14 Aug 2006 10:44:22 -0400; Rather than looking just at resistance, why not try to more fully characterize ground parameters? I fuzzily recall that a VE2 working at the Canadian government's antenna lab suggested years ago that; /archives//html/Towertalk/2006-08/msg00384.html (10,158 bytes)
35. Re: [TowerTalk] Ground Resistance (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 14 Aug 2006 10:59:47 -0400; Some years ago Polyphaser was working to develop a "dynamic ground impedance tester". He tried using a large ball several feet in diameter as a reference. It worked somewhat but the problem was too m; /archives//html/Towertalk/2006-08/msg00385.html (12,046 bytes)
36. Re: [TowerTalk] Ground Resistance (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Mon, 14 Aug 2006 09:57:25 -0700; That was the approach that George Hagn started with. Turns out that it has sensitivities to the wrong things.. small changes in distance from the soil have a much larger effect than changes in soil p; /archives//html/Towertalk/2006-08/msg00390.html (11,338 bytes)

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