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Re: Topband: Vertical choke needed?

To: topband@contesting.com
Subject: Re: Topband: Vertical choke needed?
From: Artek Manuals <Manuals@ArtekManuals.com>
Date: Thu, 31 Dec 2020 22:09:33 -0500
List-post: <mailto:topband@contesting.com>
Kenny

My personal experience with radials on the ground is that with a fair number (16 or more) that I end up with little if any common mode currents on the coax . Smaller (numbers of)� ground mounted radial counts could benefit somewhat from a choke, depends on other factors� besides the number of radials like relative ground conductivity.

Not hard to measure see https://forums.qrz.com/index.php?threads/measuring-common-mode-current.623054/page-2. you can make a simple common mode choke and do a before and after to see the relative change..if any

Elevated radial systems NEED a choke ..PERIOD. Been there , done that, got the RF burns to prove it...8^(

Dave
NR1DX



On 12/31/2020 7:15 PM, Kenneth Silverman wrote:
Hello, I have an inverted-L and the radials are laying on the ground AND
the coax is on the ground too with radials right near the coax run. Do I
need a choke to stop any feedline coupling/radiation, and if so, where in
the feedline?

The antenna is in the woods so burying either the radials or coax won't be
easy.

Many thanks, Kenny K2KW
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