Posted by
Ed - K9EW on
May 18, 2007; 10:51pm
URL: http://elecraft.85.s1.nabble.com/Shortened-w3edp-tp447722p447724.html
Hi Tom,
>From "Practical Wire Antennas", by John D Heys, B3BDQ, page 33: "The
W3EDP antenna, when examined (Fig 33), looks something like an end-fed
Zepp with a 68ft (20.7m) top and a 17ft (5.2m) feedline. The feeder
is rather unusual in that the wires which make it up need not be
parallel."
I'd describe it as an 85 foot wire (a "68ft top and a 17ft feedline"),
and you either use/don't use a separate 17 foot wire as a
"counterpoise" (the other half of the feedline). This "counterpoise"
wire is used on 40m, 20m, and 15m. It is not used on 80m and 10m.
If you can give up 80m, you can make the antenna shorter.
Hope this is the information you were looking for.
73,
ed - k9ew
On 5/18/07, Thom LaCosta <
[hidden email]> wrote:
> I have gotten confused again about the w3edp antenna.
>
> Some things say it's somewhere bewteen 84 to 89 feet long with a 17 foot
> counterpoise....one post said it's a total of 84 feet, and of that 17 feet are
> counterpoise.....the g3ycc website says 84 feet long and different lengths
> of counterpoise based on band and then there are folks like myself that
> used 85 feet with 1/4 wave counterpoises for all bands worked.
>
> I can no longer avail myself of a convenient telephone pole across the street
> from the front of my house....and in the back I have very little space.
>
> So, if one were to attempt to make a short w3edp, what might the length of the
> radiator and the counterpoise be?
>
> I remember seeing a post about various lengths that would make effective
> non-resonat end fed wires....but I can't find it
>
> Thanks
>
> Thom
>
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