[TowerTalk] Dumb question

David Gilbert ab7echo at gmail.com
Mon Apr 13 14:06:36 EDT 2026



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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