Towertalk
[Top] [All Lists]

Re: [TowerTalk] Feedline (choke) question

To: "[TowerTalk]" <towertalk@contesting.com>
Subject: Re: [TowerTalk] Feedline (choke) question
From: Brian Beezley <k6sti@att.net>
Date: Sat, 27 Sep 2025 12:55:12 -0700
List-post: <mailto:towertalk@contesting.com>
"That's a fallacy.  It simply isn't."

Dave, it would be helpful if you'd supply your reasoning.

In many ways I regard ground as just another conductor. However, unlike a wire, it is normally without resonance effects. That's the "current sink" aspect. Current will flow from a wire into ground if you make a connection. If you're using a ground rod, the impedance at the connection depends on the rod length, rod diameter, and the characteristics of the soil. If the soil is uniform, reflections don't occur, unlike for a wire of finite length. The current dissipates as it spreads within the ground, which acts like an infinitely long wire with a traveling wave. However, when ground strata are distinct and well defined, resonance can occur. An example shown for the stratified ground calculator described in the writeup below exhibits strong resonance. A water table 200 feet below a desert surface magnifies surface ground conductivity by a factor of 10, which is pretty amazing. I think such situations are rare because I suspect most variation in ground characteristics occurs gradually rather than as distinct strata, which is necessary for resonance.

https://k6sti.neocities.org/sg

Brian

_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk

<Prev in Thread] Current Thread [Next in Thread>