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Re: [TowerTalk] Feedline (choke) question

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Feedline (choke) question
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Fri, 26 Sep 2025 11:45:48 -0700
List-post: <mailto:towertalk@contesting.com>
Brian,

I suggest that you study my work on this. Fundamental concepts are in k9yc.com/RFI-Ham.pdf You clearly are not aware of the fundamental concepts on which effect HF and MF chokes are based.

A coil of coax is NOT an effective choke at HF.

73, Jim K9YC


On 9/26/2025 11:12 AM, Brian Beezley wrote:
If you had enough extra feedline at the spot you wanted to install a secondary choke, a simple solution for a single band might be a coiled- coax choke. These air-core chokes act as a trap with very high impedance. The length of coax required is somewhat less than a quarter wavelength.



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