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UHF Bi-Quad + 11RR - OPT Slideshow UHF Bi-Quad with 11 Reflector Rods analyzed using 4nec2 after determining dimensions using nikiml's Python Optimization Scripts. UHF Raw Gain = 9.8 to 11.1 dBi, F/B & F/R Ratio Min. = 18.4 dB and SWR (300-ohms) Under 2.5. Hi-VHF Raw Gain = 5.0 to 5.7 dBi, F/B & F/R Ratio = 2 to 14 dB and SWR (300-ohms) = 773 to 133 is Excessive SUMMARY OF DIMENSIONS: Feedline Separation = 2*feed = 1.0-in, Y-Coord of Outer Apex=y1 = 5.125-in, Z-Coord of Outer Apex = z1 = 6.0-in, Z-Distance from Outer Apex to Top = z2 = 3.0-in, ALL Elements AWG10 & RR QICT, RR Separation behind Hourglass = 4.25-in, Reflector Rod-to-Rod Separation = 2.125-in, RR Half-Lengths = 10.0-in. 6 Mar 20151 - 21 of 21 Images9131 visitsAlbum by holl_ands

enlarge 130KB, 893x1024 UHF Bi-Quad + 11RR - OPT 3D View enlarge 298KB, 1018x1024 UHF Bi-Quad + 11RR - OPT Front View [1 large square = 2.5 inches] enlarge 139KB, 552x1024 UHF Bi-Quad + 11RR - OPT Top View [1 large square = 2.5 inches] enlarge 187KB, 1024x741 UHF Bi-Quad + 11RR - OPT UHF Raw Gain = 9.8 to 11.1 dBi UHF F/B & F/R Ratio Minimum = 18.4 dB enlarge 186KB, 1024x741 UHF Bi-Quad + 11RR - OPT UHF SWR (300-ohms) Under 2.5 enlarge 229KB, 1024x741 UHF Bi-Quad + 11RR - OPT UHF Impedance enlarge 301KB, 1024x1024 UHF Bi-Quad + 11RR - OPT Azimuthal Pattern at 470 MHz enlarge 300KB, 1024x1024 UHF Bi-Quad + 11RR - OPT Azimuthal Pattern at 530 MHz enlarge 300KB, 1024x1024 UHF Bi-Quad + 11RR - OPT Azimuthal Pattern at 590 MHz enlarge 300KB, 1024x1024 UHF Bi-Quad + 11RR - OPT Azimuthal Pattern at 650 MHz enlarge 304KB, 1024x1024 UHF Bi-Quad + 11RR - OPT Azimuthal Pattern at 698 MHz enlarge 299KB, 1024x1024 UHF Bi-Quad + 11RR - OPT Azimuthal Pattern at 758 MHz enlarge 302KB, 1024x1024 UHF Bi-Quad + 11RR - OPT Azimuthal Pattern at 806 MHz enlarge 30KB, 791x1024 UHF Bi-Quad + 11RR - OPT 4nec2 File contains Summary of Dimensions enlarge 138KB, 516x1024 UHF Bi-Quad + 11RR - OPT Side View [1 large square = 2.5 inches] enlarge 173KB, 1024x741 UHF Bi-Quad + 11RR - OPT Hi-VHF Raw Gain = 5.0 to 5.7 dBi Hi-VHF F/B & F/R Ratio = 2 to 14 dB enlarge 184KB, 1024x741 UHF Bi-Quad + 11RR - OPT Hi-VHF SWR (300-ohms) = 773 to 133 is Excessive enlarge 250KB, 1024x741 UHF Bi-Quad + 11RR - OPT Hi-VHF Impedance enlarge 305KB, 1024x1024 UHF Bi-Quad + 11RR - OPT Azimuthal Pattern at 174 MHz enlarge 303KB, 1024x1024 UHF Bi-Quad + 11RR - OPT Azimuthal Pattern at 198 MHz enlarge 306KB, 1024x1024 UHF Bi-Quad + 11RR - OPT Azimuthal Pattern at 216 MHz