Posted by
Thom LaCosta on
Dec 14, 2005; 2:37pm
URL: http://elecraft.85.s1.nabble.com/Helix-wound-EDP-tp384542p384544.html
On Wed, 14 Dec 2005, Geoffrey Mackenzie-Kennedy wrote:
> Morning Thom,
>
> This type of antenna element has been around for a long time, since the late
> 1930s perhaps before, and bears the family name 'Normal Mode Helix'.
Ah...the term "normal" never applies to me (g).
>
> As an approximation, the length of wire required for a quarter wavelength
> element is close to a half wavelength when wound with equal spacing between
> turns.
OK
>
> If you would like I can send you some much more detailed info ( and a little
> maths!). Which bands do you want to use?
What I was hoping to do was have a helix that acted like a w3edp, ie, a
multi-band antenna. So, if the edp is 87 to 89 feet, would that mean that a
helix might be 174 to 178 feet of wire wound on the form?
thanks
73,Thom-k3hrn
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