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Re: [TowerTalk] Loading Coils

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Loading Coils
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Fri, 1 Aug 2025 14:16:50 -0700
List-post: <mailto:towertalk@contesting.com>
On 8/1/2025 10:06 AM, David Needham wrote:
If any of y'all are in need of any inductors (or loading coils) for your 80
or 160m verticals, my good friend Gaylord Gasque, N6SF, has started
manufacturing several models.

This is, indeed, great news. But in applying them, remember that loading inductance at the feedpoint results in the worst performance compared to loading closer to the far end of the antenna, because it's a current maxima. An excellent study with carefully measured field strength measurements published in QEX (in 2012, I think) clearly showed this.

If inductance must be used at the feedpoint, an autotransformer might be a better way to it.

73, Jim K9YC

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