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Re: [TowerTalk] Feedline (choke) question

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Feedline (choke) question
From: "John Keating" <john.keating@outlook.com>
Reply-to: John Keating <john.keating@outlook.com>
Date: Sat, 27 Sep 2025 20:35:02 +0000
List-post: <mailto:towertalk@contesting.com>
On a related topic, I'm getting ready to put a Mosely PRO67-C-3 on a tower. The instructions call for a coax choke, 10 turns of RG213 in a 10" diameter, taped to the boom, and within 3-6" of the choke, split the coax and wire directly to the phasing lines on the two driven elements. When I asked them if a conventional toroidal common mode choke would work they said it would be likely to affect the tuning of the antenna. I wondered if anyone can comment.

John
K7LY
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