FM Goalkeeper, a Quasi-Omni [accidental] variation of the Quad-Trapezoid+Spurs with Horizontal Polarization was analyzed using 4nec2.
FM Band Raw Gain = 2.4 to 3.1 to 2.7 dBi (Forward & Rear) and SWR (300-ohms) under 2.7 (Excellent). Beamwidth = 100-110 degrees.
Provides Bi-Directional Pattern firmly aligned along the X-Axis with wide Beamwidth and NULLs to the sides. Although Horizontally Polarized, it also provides both Right-Hand and Left-Hand Circular Polarization, but with only 1 dB LHCP suppression.
22 Jul 201412 items4707 visitsAlbum by holl_ands
enlarge 59KB, 715x1024 1 FM - Goalkeeper Quad-Trapezoid+Spurs 3D View
enlarge 203KB, 790x1024 2 FM - Goalkeeper Quad-Trapezoid+Spurs Front View [1 large square = 25-inches] Height=8+ feet x Width=6+ feet
enlarge 27KB, 791x1024 3 FM - Goalkeeper Quad-Trapezoid+Spurs 4nec2 File
enlarge 171KB, 1024x690 4 FM - Goalkeeper Quad-Trapezoid+Spurs FM Raw Gain = 2.4 to 3.1 to 2.7 dBi
enlarge 197KB, 1024x690 5 FM - Goalkeeper Quad-Trapezoid+Spurs FM SWR (300-ohms) Under 2.7
enlarge 228KB, 1024x690 6 FM - Goalkeeper Quad-Trapezoid+Spurs FM Impedance
enlarge 325KB, 1024x1024 7 FM - Goalkeeper Quad-Trapezoid+Spurs Azimuthal Pattern at 88 MHz
enlarge 325KB, 1024x1024 8 FM - Goalkeeper Quad-Trapezoid+Spurs Azimuthal Pattern at 98 MHz
enlarge 328KB, 1024x1024 9 FM - Goalkeeper Quad-Trapezoid+Spurs Azimuthal Pattern at 108 MHz
enlarge 338KB, 1024x1024 10 FM - Goalkeeper Quad-Trapezoid+Spurs Circular Polarization at 88 MHz
enlarge 340KB, 1024x1024 11 FM - Goalkeeper Quad-Trapezoid+Spurs Circular Polarization at 98 MHz
enlarge 342KB, 1024x1024 12 FM - Goalkeeper Quad-Trapezoid+Spurs Azimuthal Pattern at 108 MHz
