FM TRIAD of 4xRectangular-Loops Array, Horizontal OMNI-PLUS Array analyzed using 4nec2.
FM Raw Gain = 3.3 to 4.4 dBi [across all Angles & Freqs] and SWR (300-ohms) is Under 3.0, which is roughly 1.2 to 2.2 dB higher than a 0 dbd = 2.2 dBi Omni....hence I call it an "OMNI-PLUS".
DIMENSIONS (all in inches, from 4nec2 File): Z-Coord Height of Each Loop [Loop Height]: H=25 [hench Total = 100-in] Y-Coord Loop Width: W=35 Element to Center Array Radius: Ra=20.75 Feedpoint Gap at Middle of Dipoles: [Adjusts Impedance of Feedlines]: Gap=10 Z-Coord Length of Common Feedpoint: [Adjusts Impedance of Feedlines]: Zg=9 Z-Coord Offset between Source and Dipoles: [Adjusts Length of Feedlines]: Zo=0 [CONSTRAINT: Not Needed] Element Diameter: dia=0.1875 [3/8-in O.D.]
Note that Balun Wires would form the 9-in Length of the Vertical Common Feedpoint Wire at the Center.
4Oct201817 items1520 visitsAlbum by holl_ands
enlarge 102KB, 834x1024 1 FM TRIAD 4xRectangle-Loops OMNI-PLUS 3D View
enlarge 216KB, 765x1024 2 FM TRIAD 4xRectangle-Loops OMNI-PLUS Front View [1 large square = 12.5-inches]
enlarge 286KB, 1024x960 3 FM TRIAD 4xRectangle-Loops OMNI-PLUS Top View [1 large square = 5-inches]
enlarge 90KB, 1024x901 4 FM TRIAD 4xRectangle-Loops OMNI-PLUS 3D Detail
enlarge 180KB, 663x1024 5 FM TRIAD 4xRectangle-Loops OMNI-PLUS Side View [1 large square = 12.5-inches]
enlarge 30KB, 791x1024 6 FM TRIAD 4xRectangle-Loops OMNI-PLUS 4nec2 Text File includes Dimensions
enlarge 201KB, 1152x664 7 FM TRIAD 4xRectangle-Loops OMNI-PLUS FM Raw Gain = 3.6 to 4.2 dBi (Azi = 30-deg)
enlarge 198KB, 1152x664 8 FM TRIAD 4xRectangle-Loops OMNI-PLUS FM SWR (300-ohms) Under 3.0
enlarge 233KB, 1152x664 9 FM TRIAD 4xRectangle-Loops OMNI-PLUS FM Impedance
enlarge 310KB, 1024x1024 10 FM TRIAD 4xRectangle-Loops OMNI-PLUS Azimuthal Gain at 88 MHz = 3.3 to 3.6 dBi
enlarge 310KB, 1024x1024 11 FM TRIAD 4xRectangle-Loops OMNI-PLUS Azimuthal Gain at 98 MHz = 3.6 to 3.9 dBi
enlarge 314KB, 1024x1024 12 FM TRIAD 4xRectangle-Loops OMNI-PLUS Azimuthal Gain at 108 MHz = 4.0 to 4.4 dBi
enlarge 307KB, 1024x1024 13 FM TRIAD 4xRectangle-Loops OMNI-PLUS Elevation Gain at 88 MHz
enlarge 308KB, 1024x1024 14 FM TRIAD 4xRectangle-Loops OMNI-PLUS Elevation Gain at 98 MHz
enlarge 300KB, 1024x1024 15 FM TRIAD 4xRectangle-Loops OMNI-PLUS Elevation Gain at 108 MHz
