Very nice design.
>Here's the URL for Peter Viezbicke's description of the WWV HF
>antennas:
>http://tf.nist.gov/timefreq/general/pdf/1420.pdf
Toward the end of the following Power Point (pages 64-69) is
another design for a half wave center-fed vertical. I got the idea
from Rudy Severns, N6LF, who shows a similar design on his
website, but with a simpler choke terminating the bottom half of
the dipole.
http://audiosystemsgroup.com/NCDXACoaxChokesPPT.pdf
The original question was, how does this antenna compare to a
horizontal one? There are computed NEC predictions in the Power
Point. They correspond rather well to on-the-air comparisons with
my horizontal dipoles. There are NO radials under this vertical.
There are photos to show how it is rigged.
The pdf below compares a good quarter-wave vertical with a good
dipole using NEC predictions. The models correspond pretty well
with on-the-air observations on 160 meters. There ARE a lot of
radials under the 160M vertical, and I plan to rig an 80M over the
same radials.
http://audiosystemsgroup.com/ComparingVerticalsandDipoles.pdf
73,
Jim Brown K9YC
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