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Re: [TowerTalk] Dumb question

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Dumb question
From: David Gilbert via TowerTalk <towertalk@contesting.com>
Reply-to: David Gilbert <ab7echo@gmail.com>
Date: Mon, 13 Apr 2026 11:06:36 -0700
List-post: <mailto:towertalk@contesting.com>


Hi, Jim.

Assuming this is a homebrew design, if you can accurately describe the physical dimensions I'll try to model it for you:

1.  length and taper of the elements

2.  diameter of the elements

3.  Location of the capacity hats and a complete description of what they look like.


If the compressible coils are right at the feedpoint and on either side of it I don't need their dimensions ... I can just choose an inductance that makes the antenna resonant.

73,
Dave AB7E


On 4/13/2026 7:20 AM, jim.thom jim.thom--- via TowerTalk wrote:
When a 1/2 sized loaded  75m rotary dipole (combo of  Capacity hats  part
way out either side  +  a seco systems  compressible coils at the
feedpoint)..... what is the FS ratio... when modeled  in free space ??   (
68' log ele...tip to tip)

This is more academic than anything.   Right now,  I have no way to model
that config.

Jim   VE7RF
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