"Cecil Moore" wrote
Ed wrote:
What characteristics would a 1/2 wave dipole have if one side was
near
vertical, and the other side buried along the ground? Would it act like
a
poorly counterpoised groundplane vertical, or something else? Any
redeeming qualities?
When two radials are 180 degrees apart and elevated, they tend
to cancel the radiation from each other. When you bury one
radial, you ensure that ~half your RF energy is lost. If you
bury that one radial vertically, you do indeed lose half your
signal since you have put half of your dipole underground.
Ground mounted verticals give up approximately half their
power to ground losses. Then they give up approximately another
3 dB to a rotatable dipole. Approximately 10 ohms of the feedpoint
impedance for mobile antennas is ground losses. (Please note that
everything I said is approximate. :-)
--
73, Cecil http://www.qsl.net/w5dxp
Hello Cecil,
Is it appropriate to apply the above discussion to two random-wires, end-fed
(coax) from a 4:1 Balun were one half of the Balun output is directly
connected to ground? I would like to experiment using one or more radials
(laid on the surface of ground at first, buried if that helps). for this
antenna. Electrically, the antenna is about 1/8 wavelength for some
frequencies, and as much as 9/5 wavelength for others. The angle of the
wires is about 45 degrees elevation. One wire is about 76' and the other
42'long. I use an ATU for this antenna and it has no trouble loading
anything, however only 5-15 mhz is reliable for DX. Due to the antenna's
location on the property line, I could only apply radials 180 degrees (along
its axis) and of course if permanent, would have their ends bonded to the
station/service ground, etc.
Thanks for suggestions...
Jack Painter
Virginia Beach, Virginia