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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