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61. Re: [TenTec] OT: Indoor Antenna (score: 1): Author: Stuart Rohre <rohre@arlut.utexas.edu>; Date: Fri, 03 Dec 2010 16:10:16 -0600; Rick, any ground stake made of narrow rod is a poor RF ground. Look at "Antennas" by Kraus W8JK. Even in the earliest days of radio, they used ground screens or counterpoises to "complete" the antenn; /archives//html/TenTec/2010-12/msg00065.html (9,429 bytes)
62. Re: [TenTec] OT: Indoor Antenna (score: 1): Author: Stuart Rohre <rohre@arlut.utexas.edu>; Date: Fri, 03 Dec 2010 19:52:52 -0600; To put Steve's (G3TXQ) figures on a ground rod alone into a perspective hams can relate to, the target low impedance for 60 Hz AC ground rods in North America is 5 ohms. A 28 ohm ground rod at RF is; /archives//html/TenTec/2010-12/msg00074.html (9,897 bytes)
63. Re: [TenTec] OT: Indoor Antenna (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Fri, 03 Dec 2010 20:02:33 -0600; Target is 5 ohms but it often takes two three or more rods to achieve 5 ohms unless in a salt marsh swamp. Fresh water swamp land doesn't do as well. A 20 ohm ground is more typical. 73, Jerry, K0CQ; /archives//html/TenTec/2010-12/msg00075.html (11,034 bytes)
64. Re: [TenTec] OT: Indoor Antenna (score: 1): Author: kf6e@mail.com; Date: Sat, 04 Dec 2010 09:32:29 -0500; How did you measure the efficiency? Or was it from a model? Frank To illustrate Ken's point, here are some measurements I made on the feedpoint resistance of my 160m 40ft top-loaded vertical as I add; /archives//html/TenTec/2010-12/msg00081.html (12,303 bytes)
65. Re: [TenTec] OT: Indoor Antenna (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sat, 04 Dec 2010 15:12:40 +0000; Frank, Efficiency was calculated, knowing that Rrad should be 5 Ohms. So for example with just the ground rod, efficiency = 5/33 = 15.15% 73, Steve G3TXQ _____________________________________________; /archives//html/TenTec/2010-12/msg00084.html (10,170 bytes)

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