I used elevated radials on an elevated (3 foot off the ground) 80 meter
vertical.
I ran the radials at a 45 degree angle from the base of the vertical up to a
10
foot height and then horizontal from that point on. Using an antenna
analyzer,
I found the resonant frequency of the vertical moved to 4.000 mhz. The
design
height or length of the vertical was supposed to be 3.750 mhz. After
installing
30 elevated radials, I tried an experiment and removed the elevated radials
and ran 30
radials at a 45 degree angle down to the ground and then on the ground from
that point on. The resonant frequency of the vertical came down
dramatically
to the design frequency of 3.750mhz. This seems to indicate that using
elevated radials does raise the resonant frequency of the vertical if the
radials
leave the base of the vertical to a position higher than the base. Just my
actual experience. BTW, I left the radials on the ground. Much easier to
handle.
Bill
K2WH
-----Original Message-----
From: topband-admin@contesting.com
[mailto:topband-admin@contesting.com]On Behalf Of La6wea
Sent: Wednesday, October 10, 2001 14:05 PM
To: Topband
Subject: Topband: Elevating radials
Hi all.
If I understand you guys right. adding toploading to a vertical actually
shorten the effectiv antenna if the slooping wires are slooping down at
that`s say 45 deg. What will happen to a ground mounted vertical that have
radials slooping upwards 20 feet at 45 deg and the rest horisontal. Will the
radials shorten the radiating part of the vertical ?
73 Ken
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