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41. Re: [TowerTalk] New N6LF Ground Probe Designs (score: 1): Author: Brian Beezley <k6sti@att.net>; Date: Sat, 2 Mar 2024 15:07:01 -0800; Thanks for the reference, Paul. I located it here: https://nvlpubs.nist.gov/nistpubs/Legacy/TN/nbstechnicalnote139.pdf Brian _______________________________________________ _________________________; /archives//html/Towertalk/2024-03/msg00011.html (8,649 bytes)
42. Re: [TowerTalk] New N6LF Ground Probe Designs (score: 1): Author: Brian Beezley <k6sti@att.net>; Date: Sun, 3 Mar 2024 11:53:37 -0800; Good guess, Jim. N6LF just sent me an old IRE article from 1954 that explains the derivation of the map. It's intended to predict propagation for AM broadcast signals over broad areas, not accurately; /archives//html/Towertalk/2024-03/msg00014.html (8,943 bytes)
43. Re: [TowerTalk] New N6LF Ground Probe Designs (score: 1): Author: Brian Beezley <k6sti@att.net>; Date: Sun, 3 Mar 2024 16:43:48 -0800; https://www.antennasbyn6lf.com/ The reference I gave to his original soil parameter article was actually to a preliminary version. Here's the final article: https://rudys.typepad.com/files/qex-nov-de; /archives//html/Towertalk/2024-03/msg00016.html (8,943 bytes)
44. [TowerTalk] HF Ground Parameters (score: 1): Author: Brian Beezley <k6sti@att.net>; Date: Thu, 28 Mar 2024 13:10:59 -0700; Ground permittivity and conductivity are needed to model an antenna over ground. Accurate values are particularly important for vertical antennas and for horizontal antennas with low conductors. You; /archives//html/Towertalk/2024-03/msg00111.html (8,575 bytes)
45. Re: [TowerTalk] HF Ground Parameters (score: 1): Author: Brian Beezley <k6sti@att.net>; Date: Thu, 28 Mar 2024 17:06:56 -0700; "Brian, can you comment on how your table values relate to the frequency adjusted ground characteristics shown by EZNEC?" Dan, I've never used EZNEC and know nothing about it. The ground parameters a; /archives//html/Towertalk/2024-03/msg00114.html (7,277 bytes)
46. [TowerTalk] Revised HF Ground Parameters (score: 1): Author: Brian Beezley <k6sti@att.net>; Date: Tue, 9 Apr 2024 11:15:39 -0700; I've updated my writeup on HF ground parameters. I revised the extrapolation of 1 MHz FCC data to the HF ham bands. I also added data for seawater and freshwater, both of which vary considerably with; /archives//html/Towertalk/2024-04/msg00005.html (7,481 bytes)
47. [TowerTalk] Ground Constants (score: 1): Author: Brian Beezley <k6sti@att.net>; Date: Wed, 29 May 2024 12:28:05 -0700; To better represent specific terrain, my HF Ground Constants page now includes an interpolator for the Hagn generic curves. The Hagn HF values are more realistic than the ARRL ground constants offere; /archives//html/Towertalk/2024-05/msg00109.html (8,082 bytes)
48. Re: [TowerTalk] 80M Delta Loop (score: 1): Author: Brian Beezley <k6sti@att.net>; Date: Thu, 25 Jul 2024 17:01:06 -0700; conductivity is poor. That's a good use of the FCC map, Jim. I had completely written it off for ham use once I discovered that it applies only to the AM broadcast band. Values will be quite differen; /archives//html/Towertalk/2024-07/msg00091.html (8,673 bytes)
49. Re: [TowerTalk] 80M Delta Loop (score: 1): Author: Brian Beezley <k6sti@att.net>; Date: Thu, 25 Jul 2024 22:01:14 -0700; Try this: http://ham-radio.com/k6sti/FCCMapArticle.pdf Brian _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contestin; /archives//html/Towertalk/2024-07/msg00093.html (7,413 bytes)
50. Re: [TowerTalk] 80M Delta Loop (score: 1): Author: Brian Beezley <k6sti@att.net>; Date: Fri, 26 Jul 2024 07:42:39 -0700; There's a problem with using the FCC conductivity map to rank HF conductivities that I overlooked: skin depth is much smaller at HF. Soil with different conductivity may come into play at broadcast f; /archives//html/Towertalk/2024-07/msg00096.html (8,778 bytes)
51. Re: [TowerTalk] 80M Delta Loop (bobtail curtain) (score: 1): Author: Brian Beezley <k6sti@att.net>; Date: Sat, 27 Jul 2024 04:56:38 -0700; The bobtail virtually eliminates loss due to feedpoint ground current. And it minimizes ground current loss near the antenna since high wire currents are well away from ground. But it can't escape th; /archives//html/Towertalk/2024-07/msg00112.html (8,170 bytes)
52. [TowerTalk] Stratified Ground (score: 1): Author: Brian Beezley <k6sti@att.net>; Date: Fri, 22 Nov 2024 16:01:21 -0800; I wrote a program to analyze stratified ground. Normally you have no idea what's deep below, but the program also works for local strata like a concrete house foundation, an asphalt driveway, or snow; /archives//html/Towertalk/2024-11/msg00075.html (7,707 bytes)

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