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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 14:53:03 -0700
List-post: <mailto:towertalk@contesting.com>
On 9/26/2025 2:17 PM, Jack Brindle via TowerTalk wrote:
Sigh. I am fairly certain that I have seen, at NCCC meetings, 4” toroids in 
your preferred mix wound for testing.

Yes, I hoped they would be a useful tool, but when I built and measured about 70 chokes in multiple winding styles, they turn out to be useful only on 80 and 160M.

And Fair-Rite #31 mix is the only ferrite I've found that is useful for chokes at HF and 160M.

73, Jim K9YC

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