I was reading an old 73 Magazine, (May, 69') when I saw an article discussing Off Center Fed longwires. The article examines directivity pattern of a 3.5 wavelength longwire. Article shows how the ra
I have enjoyed working with ELNEC and EZNEC and modeled my favorite wire antenna, a full-wave antenna, fed a quarter-wave from one end. In free space it's a clover leaf, and above real ground it's go
Well, it just occurred to me that if the feedline were not isolated from the antenna, such as feeding the OCF with a straight wire (like one version of the old Windom), or using balanced wire feedlin
A FULL WAVELENGTH Wire, fed in the CENTER acts as TWO - Half Waves in Phase with a typical dipole pattern, narrowed to about 50+ degrees beamwidth. The feed impedance is extremely high (~3000 ohms or
The athuor of the 1969 article (John Schultz, W2EEY) plots horizontal radiation patterns for a 3.5 wl version @ 9 diffrent feedpoints along the length of the wire. The patterns are very interesting.
I just modeled a 3.5 WL wire 1/2 WL above ground, fed in the center, at each end, and at 25 percent of the length from one end. The patterns are almost the same, regardless of the feedpoint location.
Hello to all; I also modeled a 3.5 wl wire using EZNEC and observed exactly what Pete reports at .5 and at 1.0 wl above ground. It is moderately directional, with the strongest signal in an arc off e
TakeOff Angle is VERY much dependent on height of the antenna. The Radiated Pattern over ground is computed by multiplying the Free Space Pattern of the Antenna times the Ground Reflection Coefficien