[Elecraft] OT- Radials for Vertical Antenna

[Ron D'Eau Claire]

All of the "no radial verticals" that I've seen are electrically 1/2
wavelength long and so behave as an end-fed dipole. Since the feed point
impedance is very high, there is very little current flowing and so a ground
connection has relatively little impact on the efficiency. 

Another great reference for vertical antennas is "Vertical Antenna Classics"
published by the ARRL (ARRL Order No. 5218, ISBN 0-87259-521-8)

73, Ron AC7AC

-----Original Message-----
...If elevated radials are not tuned and not quarter wave, the efficiency
may be even higher than with quarter wave radials but the feed point is
likely to be at a very high voltage. This requires either very high
impedance chokes or transformers. No radial verticals are case in point.

There is a 160m vertical with innovative elevated radial
(http://www.w0uce.net/K2AVantennas.html). It is equivalent to two elevated
radials and coil. There is an anecdotal information that this vertical works
much better than a vertical with many short ground radials. 

Ignacy, NO9E





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