Posted by
Charlie T, K3ICH on
Dec 07, 2018; 10:29pm
URL: http://elecraft.85.s1.nabble.com/Re-Less-Than-Perfect-Antennas-tp7646930.html
I wonder if anyone has ever tried, for want of a better name, a "Skeleton
Cone" which consists of a single horizontal wire connected to the coax
center conductor and two sloping wires at 45 degrees, in the same plane
connected to the coax shield. A true Discone antenna would have many
(typically eight each) horizontal and sloping elements. I'm guessing many
of us have used the VHF/UHF version for very wide band coverage, for
example 144, 220, 432 MHz and even higher. I know I have one up and it
performs as well as a regular single band ¼λ ground plane (unity gain)
on all three bands with low SWR. The ICOM version as well as a few others,
also have a loaded whip for 52 MHz mounted on the bushing that the
horizontal elements are screwed into.
I'm also guessing the formulas for a true Discone would work for a
"skeleton" style as well. I Since it is inherently a wide band design, the
actual lengths are probably not too critical. I've heard this type antenna
described, but I don't remember where or how well it supposedly worked. It
obviously requires two supports, high enough that the sloping wires ends
are off the ground by a bit.
73, Charlie k3ICH
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