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Re: [TowerTalk] Feedline (choke) question

To: "[TowerTalk]" <towertalk@contesting.com>
Subject: Re: [TowerTalk] Feedline (choke) question
From: Brian Beezley <k6sti@att.net>
Date: Fri, 26 Sep 2025 12:34:06 -0700
List-post: <mailto:towertalk@contesting.com>
"A coil of coax is NOT an effective choke at HF."

Jim, take a look at the reference I provided for a coiled-coax choke I made for the FM broadcast band. It measured 63k ohms at resonance. The impedance dropped off toward the edges of the 20%-wide FMBC band, but it was still adequate. I see no reason one of these couldn't cover a single HF ham band at 40m and above, where bandwidth is no more than a few percent. I think a coiled-coax choke is too big below 40m.

Brian

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