- 81. Re: [TowerTalk] Feedline (choke) question (score: 1)
- Author: Brian Beezley <k6sti@att.net>
- Date: Sun, 28 Sep 2025 02:07:42 -0700
- https://i.postimg.cc/8k2w1vDW/ant.png This models a 20-meter dipole 20' above ground with a common-mode current path. The vertical wire, which is connected to one side of the feedpoint, represents th
- /archives//html/Towertalk/2025-09/msg00102.html (10,664 bytes)
- 82. Re: [TowerTalk] Feedline (choke) question (score: 1)
- Author: Brian Beezley <k6sti@att.net>
- Date: Sun, 28 Sep 2025 02:29:17 -0700
- "N6LF has published a lot of great work, really scientific studies of ground systems for antennas. His website is a great resource." Jim, Rudy's website is going away because Typepad is folding. He d
- /archives//html/Towertalk/2025-09/msg00103.html (10,171 bytes)
- 83. Re: [TowerTalk] Feedline (choke) question (score: 1)
- Author: Brian Beezley <k6sti@att.net>
- Date: Tue, 30 Sep 2025 03:32:58 -0700
- "Reference my early example of a portable rig with no connection to ground anywhere." Dave, I'm curious what you made of my antenna model that showed common-mode current flowing to ground from the co
- /archives//html/Towertalk/2025-09/msg00120.html (9,854 bytes)
- 84. Re: [TowerTalk] Feedline (choke) question (score: 1)
- Author: Brian Beezley <k6sti@att.net>
- Date: Tue, 30 Sep 2025 10:17:31 -0700
- "I already answered that." Dave, the antenna model I posted contradicts this assertion you made: "I already did with the example of a floating portable setup. Current requires an E-field to push it.
- /archives//html/Towertalk/2025-09/msg00123.html (10,318 bytes)
- 85. Re: [TowerTalk] Feedline (choke) question (score: 1)
- Author: Brian Beezley <k6sti@att.net>
- Date: Tue, 30 Sep 2025 10:51:18 -0700
- "RF isn't DC ... it doesn't just flow to the earth and disappear. It flows back and forth every half cycle." That brought to mind the AC/DC power rivalry of the late 1800s. George Westinghouse, with
- /archives//html/Towertalk/2025-09/msg00124.html (10,482 bytes)
- 86. Re: [TowerTalk] Feedline (choke) question (score: 1)
- Author: Brian Beezley <k6sti@att.net>
- Date: Tue, 30 Sep 2025 13:29:17 -0700
- "It just shows current going back and forth between the earth and the coax." Dave, I don't know what you mean by back and forth. In my model, the ground wire simply has current. It is about three tim
- /archives//html/Towertalk/2025-09/msg00126.html (10,509 bytes)
- 87. [TowerTalk] Updates (score: 1)
- Author: Brian Beezley <k6sti@att.net>
- Date: Sun, 12 Oct 2025 07:46:49 -0700
- I've updated my coil inductance and Q calculator and my ground probe calculator with improved plots: https://k6sti.neocities.org/coil https://k6sti.neocities.org/gnd If you don't measure your soil wi
- /archives//html/Towertalk/2025-10/msg00038.html (7,027 bytes)
- 88. Re: [TowerTalk] Raised Radial Spacing (score: 1)
- Author: Brian Beezley <k6sti@att.net>
- Date: Sun, 26 Oct 2025 01:06:39 -0700
- "The great thing about a vertical is that it really 'wants to work.'" Whenever I encounter this notion, it provokes mental bedlam that includes a chaotic mix of surprise, appreciation, exasperation,
- /archives//html/Towertalk/2025-10/msg00064.html (8,023 bytes)
- 89. Re: [TowerTalk] Raised Radial Spacing (score: 1)
- Author: Brian Beezley <k6sti@att.net>
- Date: Sun, 26 Oct 2025 14:12:48 -0700
- "Anyway, in some cases they ran stupid long radials but in very limited directions (like a gob of them over just 5 degrees then 10 degrees etc etc) then they measured the verticals azimuth directivit
- /archives//html/Towertalk/2025-10/msg00068.html (8,616 bytes)
- 90. Re: [TowerTalk] Raised Radial Spacing (score: 1)
- Author: Brian Beezley <k6sti@att.net>
- Date: Tue, 28 Oct 2025 08:33:13 -0700
- W6FB: "In this design the ground wire is actually a 1/4 wave ring that wraps around the base of the antenna." One issue with a compact counterpoise is that feedline decoupling becomes more difficult.
- /archives//html/Towertalk/2025-10/msg00086.html (10,521 bytes)
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