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" <[EMAIL PROTECTED]>
To: "David Cutter" <[EMAIL PROTECTED]>
Cc: "James Duffey" <[EMAIL PROTECTED]>; <elecraft@mailman.qth.net>
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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