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Total 208 documents matching your query.

201. Re: [TowerTalk] Feedline (choke) question (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Mon, 29 Sep 2025 15:40:49 -0700
The original postulation from Brian, K6STI, was that connecting the shield of the coax to ground at a point where any common mode current might exist would shunt it to ground. I've claimed that's a f
/archives//html/Towertalk/2025-09/msg00116.html (17,297 bytes)

202. Re: [TowerTalk] Feedline (choke) question (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Tue, 30 Sep 2025 02:04:55 -0700
What you are describing is totally different than the original claim (and the subsequent discussion) that the earth is an RF sink.  What was the purpose in doing that? Yes, you can make the earth act
/archives//html/Towertalk/2025-09/msg00119.html (24,390 bytes)

203. Re: [TowerTalk] Feedline (choke) question (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Tue, 30 Sep 2025 09:43:15 -0700
I already answered that.  RF isn't DC ... it doesn't just flow to the earth and disappear.  It flows back and forth every half cycle. Whatever current flow may occur between the coax and ground is st
/archives//html/Towertalk/2025-09/msg00122.html (11,079 bytes)

204. Re: [TowerTalk] Feedline (choke) question (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Tue, 30 Sep 2025 12:21:02 -0700
Brian, I didn't say there shouldn't be any current.  I said there isn't any current that just goes to ground and stays there ... as in bleeding it off.  EZNEC doesn't show that either.  It just shows
/archives//html/Towertalk/2025-09/msg00125.html (11,338 bytes)

205. Re: [TowerTalk] Feedline (choke) question (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Tue, 30 Sep 2025 13:37:33 -0700
Possibly I missed it, but I don't see your EZNEC model.  I only saw the diagram.  Can you send me the model? Dave   AB7E Dave, I don't know what you mean by back and forth. In my model, the ground wi
/archives//html/Towertalk/2025-09/msg00127.html (11,350 bytes)

206. Re: [TowerTalk] Raised Radial Spacing (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Mon, 27 Oct 2025 21:33:19 -0700
The VOR is a very valid concept, and I've modeled it in a couple of different ways to investigate it.  I'm even thinking of building an 80m vertical based upon it so I don't have to string wires arou
/archives//html/Towertalk/2025-10/msg00083.html (14,766 bytes)

207. Re: [TowerTalk] Raised Radial Spacing (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Tue, 28 Oct 2025 17:23:14 -0700
Exactly so, Jim.  I don't know why Zero Five would think that's a good idea. Dave   AB7E On 10/28/2025 1:58 PM, Jim Brown wrote: On 10/28/2025 11:15 AM, n1bkb-- via TowerTalk wrote: While I have not
/archives//html/Towertalk/2025-10/msg00096.html (10,726 bytes)

208. Re: [TowerTalk] Raised Radial Spacing (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Mon, 3 Nov 2025 18:50:06 -0700
Most of a lifetime ago I was a component engineer at Collins Radio, and one of the products I was responsible for was a small ferrite core.  The manufacturer's rep explained the manufacturing process
/archives//html/Towertalk/2025-11/msg00017.html (8,844 bytes)

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