Posted by
Ron D'Eau Claire-2 on
Dec 14, 2005; 6:53pm
URL: http://elecraft.85.s1.nabble.com/Helix-wound-EDP-tp384542p384550.html
No, it was center fed like an inverted V, so it was fed at the bottom of the
pole in his arrangement with one side of the feedline going to the pipe and
the other going to the horizontal wire. (Otherwise it wouldn't be a
'doublet').
Yes, the arrangement would introduce some unbalance in the feeders.
Ron AC7AC
-----Original Message-----
From:
[hidden email]
[mailto:
[hidden email]] On Behalf Of Vic K2VCO
Sent: Wednesday, December 14, 2005 10:41 AM
To: 'Elecraft Discussion List'
Subject: Re: [Elecraft] Helix-wound EDP
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_______________________________________________
Elecraft mailing list
Post to:
[hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help:
http://mailman.qth.net/subscribers.htmElecraft web page:
http://www.elecraft.com_______________________________________________
Elecraft mailing list
Post to:
[hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help:
http://mailman.qth.net/subscribers.htmElecraft web page:
http://www.elecraft.com