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Total 349 documents matching your query.

341. Re: [TowerTalk] Feedline (choke) question (score: 1)
Author: Brian Beezley <k6sti@att.net>
Date: Sat, 27 Sep 2025 23:50:48 -0700
"Earth ground affects transmitted RF because the radiated RF impinges on the earth and is absorbed and reflected, the ratio between the two being affected by the parameters of the earth (conductivity
/archives//html/Towertalk/2025-09/msg00097.html (10,338 bytes)

342. Re: [TowerTalk] Feedline (choke) question (score: 1)
Author: Brian Beezley <k6sti@att.net>
Date: Sun, 28 Sep 2025 00:51:34 -0700
"If you connect a wire from any point on the dipole to ground, current will flow." That corrects the typo. I wanted to add that one way to visualize things is to employ the image-current model that a
/archives//html/Towertalk/2025-09/msg00101.html (10,103 bytes)

343. 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)

344. 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)

345. 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)

346. 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)

347. 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)

348. 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)

349. [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)

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