[TowerTalk] Discone Radiation Angle ?
Jim Lux
jimlux at earthlink.net
Mon Dec 13 14:08:23 EST 2004
At 10:05 AM 12/13/2004, douglas.snowden at med.va.gov wrote:
>I have not gotten into antenna modleing enough to have done this, but does a
>Discone
>antenna have a low radiation angle or not? I don't think I have ever heard
>of anyone
>actually using one on HF.
>
>
>Doug N4IJ
>
There was an article a while back in QST, or an antenna compendium, or the
antenna book describing an HF discone (skirt of many radials from tall
pole, etc.)
There have been some radio telescopes built with discones and other similar
frequency independent antennas.
It's a vertically polarized antenna, and one would expect it to have
radiation patterns much like any other vertically polarized antenna of
similar size. One virtue of discones is that they are wideband.
This virtue is less useful for ham applications, where the bands are fairly
limited, and the modulation even more so. One can achieve essentially the
same radiation efficiency with a much smaller antenna (i.e. some form of
vertical) with low loss tuned circuits to get the feedpoint impedances right.
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