[Elecraft] Helix-wound EDP

[Thom R LaCosta]

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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