[Antennas] Want HF No Radials Vertical

[Bob Nielsen]

On Sun, Jan 18, 2004 at 03:45:08PM -0500, Ron & Madhavi wrote:
> Bob, when salt water comes into the equation you get away with pretty much
> anything! When we speak of the efficiency of a vertical (esp radial less),
> we generally assume poor/average ground.

I certainly agree, Ron.  I didn't expect it to help much without being
right at the shoreline, but I'm definitely not complaining :^) 

After moving here from Arizona (and before putting up the vertical) I
threw up an L-shaped piece of wire 33 ft on one leg and 70 ft on the
other, fed at the corner with coax and a choke balun (it fit the
dimensions of the roof) only about 17 feet above ground and worked QRP
DXCC in less than a year, just to see if I could do it (conditions were
pretty good in 2000-2001, which helped).

I suspect the no-radial verticals probably work a bit better above poor
ground if elevated a bit so there is less ground coupling, although I
haven't really analyzed that.

The AV-640 is longer than 1/4 wavelength on each band (capacity loaded
on 15, 20, 30 and 40) and I guess one could say they are off-center fed
(counting the counterpoise as the other section) although I cringe a
bit at Hy-Gain referring to it as a Windom in some of their ads.

73, Bob N7XY

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Bob Nielsen, N7XY                          n7xy (at) n7xy.net
Bainbridge Island, WA                      http://www.n7xy.net