[Elecraft] Helix-wound EDP

[Vic K2VCO]

Ron D'Eau Claire wrote:

> Some years ago Doug DeMaw, W1FB, published a design that might work for you
> in a tight situation. I've considered it here, although the short doublet
> has worked well enough that I've not tried it. He bent a doublet at 90%,
> like you might for an extreme "inverted V" design, but arranged it so one
> radiator was horizontal to the earth, making the other one vertical. He used
> guyed aluminum pipe for the vertical radiator and a simple wire for the
> horizontal radiator. The system is fed with open wire line and an efficient,
> balanced ATU. 

I seem to remember this being fed at the bottom, making it a one-radial 
ground plane.  But maybe it was center-fed at the top, as your 
description suggests.  Either way, the idea appealed to me, because it 
would have high and low-angle components, although both the vertical and 
horizontal patterns would be skewed.

One thing that bothered me about this antenna was that there might (I 
suspect) be a significant current imbalance in the feedline because of 
the two legs' unbalanced relationship to ground.  That would cause 
radiation loss from the feedline (and noise pickup).

But maybe not -- in which case ths would be a very interesting antenna!

-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco