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41. Topband: Ground parameter measurements (score: 1): Author: "Rudy Severns" <rudys@ordata.com>; Date: Thu, 17 Nov 2005 09:39:55 -0800; For those who would like to have some estimate of their local ground parameters at HF there are ways to make reasonable measurements with simple test gear . You will find a discussion of one approach; /archives//html/Topband/2005-11/msg00210.html (7,054 bytes)
42. Topband: ground parameters (score: 1): Author: "Rudy Severns" <rudys@ordata.com>; Date: Fri, 18 Nov 2005 13:51:50 -0800; Antenna modeling has become an important part of the antenna game. Knowledge of the ground parameters is assumed as part of the modeling process. Unfortunately, few of us have any real knowledge of o; /archives//html/Topband/2005-11/msg00231.html (8,772 bytes)
43. Re: Topband: Ground parameter measurements (score: 1): Author: "Rudy Severns" <rudys@ordata.com>; Date: Fri, 18 Nov 2005 14:07:10 -0800; Just a comment on the attenuation slope method. When the ground characteristics are dominated by conductivity, as they usually are at BC frequencies, the slope method is pretty reasonable. It gives g; /archives//html/Topband/2005-11/msg00232.html (8,480 bytes)
44. Topband: 4W3ZZ (score: 1): Author: "Rudy Severns" <rudys@ordata.com>; Date: Sat, 26 Nov 2005 11:22:57 -0800; 4W3ZZ was light but workable at west coast sunrise in OR, about 1500Z. Unfortunately everybody seemed to be down the band in the JA sub-band and he went unnoticed. At least I didn't have to fight a m; /archives//html/Topband/2005-11/msg00329.html (6,642 bytes)
45. Topband: Irrigation verticals (score: 1): Author: "Rudy Severns" <rudys@ordata.com>; Date: Thu, 5 Jan 2006 16:06:29 -0800; A couple of comments on Larry's irrigation pipe vertical. The clamp he shows on his web site is a standard item at places that sell the pipe. The clamps are iron but heavily galvanized and I have nev; /archives//html/Topband/2006-01/msg00082.html (7,048 bytes)
46. Topband: Irrigation pipe (score: 1): Author: "Rudy Severns" <rudys@ordata.com>; Date: Fri, 6 Jan 2006 09:22:01 -0800; Hi Eddy, I live at the southern end of the Willamette valley which is largely a farming area. Irrigation is widely used so we have specialty business' which stock the pipe and a wide range of fitting; /archives//html/Topband/2006-01/msg00091.html (6,897 bytes)
47. Topband: Loop discussion (score: 1): Author: "Rudy Severns" <rudys@ordata.com>; Date: Thu, 18 May 2006 12:08:46 -0700; This current loop antenna discussion has been replayed continuously since the 1920's in both professional and amateur circles, usually with more smoke than light. If you want to know how a loop works; /archives//html/Topband/2006-05/msg00047.html (6,616 bytes)
48. Topband: Loop antennas (score: 1): Author: "Rudy Severns" <rudys@ordata.com>; Date: Thu, 18 May 2006 21:11:46 -0700; The explanation given by Tom is taken directly from: Page 234-235, King, Mimno and Young, Transmission Lines, Antennas and Wave Guides. McGraw-Hill 1945. 73, Rudy N6LF _______________________________; /archives//html/Topband/2006-05/msg00050.html (6,205 bytes)
49. Topband: Loops (score: 1): Author: "Rudy Severns" <rudys@ordata.com>; Date: Fri, 19 May 2006 10:23:43 -0700; We should remember that historically, loops were developed for direction finding. In that application sharp, deep nulls were important. In addition symmetrical patterns were desired that did not chan; /archives//html/Topband/2006-05/msg00052.html (7,540 bytes)
50. Topband: radial systems (score: 1): Author: "Rudy Severns" <rudys@ordata.com>; Date: Sun, 6 Aug 2006 11:04:45 -0700; In regard to Tom's comment that measurements of base impedance are not all that indicative of ground loss or efficiency. It turns out that that effect has been well known in theory as well as practic; /archives//html/Topband/2006-08/msg00045.html (8,660 bytes)
51. Topband: metal roof ground plane (score: 1): Author: "Rudy Severns" <rudys@ordata.com>; Date: Thu, 14 Sep 2006 11:57:48 -0700; I would like to point out a couple of important points to those of you who have been reading my QEX article. 2) All the metal sheets were bonded together. 3) Even for that much roof area, I still had; /archives//html/Topband/2006-09/msg00052.html (7,199 bytes)
52. Topband: 600 m operation (score: 1): Author: "Rudy Severns" <rudys@ordata.com>; Date: Fri, 22 Sep 2006 11:41:42 -0700; As many of you are aware, a group of us has begun experimental operation on 600 m (505-510) kHz. I am on the air at 506 kHz operating in the beacon mode. The message is: VVV VVV VVV VVV VVV DE WD2XSH; /archives//html/Topband/2006-09/msg00083.html (7,094 bytes)
53. Topband: 160 m ground system measurements (score: 1): Author: "Rudy Severns" <rudys@ordata.com>; Date: Sat, 23 Sep 2006 13:53:50 -0700; Recently we've had a good deal a talk about ground systems. Here is a example of some actual test data on a new 160 m ground system. Over the summer I laid down a new radial system for 160 m. During; /archives//html/Topband/2006-09/msg00088.html (6,627 bytes)
54. Topband: radial length (score: 1): Author: "Rudy Severns" <rudys@ordata.com>; Date: Mon, 2 Oct 2006 20:41:24 -0700; Tom and Jim's comments on radials are right on the mark. Some time back I scribbled a few notes on grid ground systems and the sizing of the grid. Although the subject is a grid system, the notes als; /archives//html/Topband/2006-10/msg00019.html (6,943 bytes)
55. Topband: radial systems (score: 1): Author: "Rudy Severns" <rudys@ordata.com>; Date: Sun, 19 Nov 2006 09:31:15 -0800; I wanted to remind everyone that the data I showed on signal strength versus radial number is for my particular location. If your soil is significantly better than mine, the difference between 4 and; /archives//html/Topband/2006-11/msg00118.html (6,941 bytes)
56. Topband: effect of trees (score: 1): Author: "Rudy Severns" <rudys@ordata.com>; Date: Mon, 4 Dec 2006 09:25:05 -0800; I noticed no one has mentioned Carl's (K9LA) March/April 2006 NCJ article on the effect of forest on low band operation. I got ahold of the two technical papers he references by Tamir which are the b; /archives//html/Topband/2006-12/msg00049.html (8,009 bytes)

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