Posted by
David Cutter on
Mar 04, 2007; 7:58am
URL: http://elecraft.85.s1.nabble.com/Vetical-Antennas-tp444386p444390.html
Doc
I didn't mean to mislead you: I don't own a 5BTV myself, but there seems to
be a lot of them around. If it is common practice to put them on a pole,
then the pole ought to be useful on the lower bands using the 5BTV and its
radials as at least partial loading for 80 and 160.
A simple idea might be to have a separate feeder for the lower bands to the
bottom of the pole with a loading/matching coil, though it would need a lot
of wire in/on the ground to make it half decent. At least the higher bands
would be relatively efficient.
But I can't help thinking that feeding the pole from the top would be
workable and perhaps more efficient: I've seen this done with a beam and
tower arrangement in which the beam is isolated from the tower and an auto
tuner fitted between.
David
G3UNA
----- Original Message -----
From: "James Duffey" <
[hidden email]>
To: "David Cutter" <
[hidden email]>
Cc: "James Duffey" <
[hidden email]>; <
[hidden email]>
Sent: Saturday, March 03, 2007 7:58 PM
Subject: Re: [Elecraft] Vetical Antennas
> Dave - I sure don't have anything specific off the top of my head.
>
> You might try replacing the resonator coil and the whip above that for 80
> M with a 40 M trap and extending a wire long enough to make the antenna
> resonant on 80 M from the top of the trap horizontally to a tree or
> something. You could even droop it a bit/ This would improve the
> efficiency on 80 M a lot over the stock arrangement. If you had enough
> horizontal space, you might put a 160M trap at the end of that wire and
> add enough wire to make that resonant at 160M.
>
> Both of these, while not great efficiency wise, would at least get you on
> the band. - Dr. Megacycle KK6MC/
>
> --
> James Duffey KK6MC/5
> Cedar Crest NM 87008
> DM65
>
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