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holl_ands | Home > Stacked Antennas > Vertically Stacked UHF Antennas > Browse:UHF Stacked Antennas Comparison ChartsVert-Stack FF6 + DoubleAngleRefl.Vert-Stack FF4 + DoubleAngleRefl.Vert-Stack FF4 SingleAngleRefl SidelobesVert-Stack M4 (9.5x9) + DoubleAngleRefl.Vert-Stack M4 (9.5x9) + NO Refl. + HHHUHF Vert-Stack CM4221 4-Bays - OPTUHF Vertical Stacked A-D 91XGUHF V-Stack 8-El FD-Yagi w. 2RR Ea - OPTVert-Stack UHF Hourglass-Loop - NO ReflV-Stack UHF Hourglass-Loop + 15RRV-Stack UHF Quad-Trap-Loop - 15RR
Vert-Stack FF4 SingleAngleRefl Sidelobes Vertical Stack FF4 (Free Form 4-Bay Bowtie) with Single Angle Reflector (providing Deep Sidelobe Nulls) analyzed using 4nec2.  HVH (Holl_ands Vertical Harness) dimensions were determined using nikiml's Python Optimization Scripts.  Each FF4 was assumed to be identical to the OPTIMUM non-stacked version found here: http://imageevent.com/holl_ands/multibay/4bayrefl/uhffreeform4baysnglanglrefldeepsidelobes UHF Raw Gain = 17.0 to 19.4 to 19.3 dBi, F/B & F/R Min. = 14.1 dB and SWR (300-ohms) under 2.4. Hi-VHF Raw Gain = 12.0 to 11.5 dBi, F/B & F/R Ratio Min. = 12.7 dB and SWR (300-ohms) = 73 to 26 is Excessive. SIDELOBE NULL RAW GAIN & ANGLE AWAY FROM MAX BEAM:   FREQ: 470      530      590      650      698      758      806 MHz BEND: 2.0-in  -3.1     -10.1    -11.6    -3.7      2.6       3.6        5.9  dBi        45-deg  40-deg  35-deg  35-deg  30-deg  25-deg  20-deg Date(s): 31Jul2015. Album by holl_ands. 1 - 21 of 21 Total. 2024 Visits.
enlarge 124KB, 611x1024 1 Vert-Stack FF4 SingleAngleRefl Deep UHF Sidelobe Nulls 3D View enlarge 208KB, 576x1024 2 Vert-Stack FF4 SingleAngleRefl Deep UHF Sidelobe Nulls Front View [1 large square = 12.5 inches] enlarge 142KB, 430x1024 3 Vert-Stack FF4 SingleAngleRefl Deep UHF Sidelobe Nulls Top View [1 large square = 2.5 inches] enlarge 178KB, 1024x741 4 Vert-Stack FF4 SingleAngleRefl Deep UHF Sidelobe Nulls UHF Raw Gain = 17.0 to 19.4 to 19.3 dBi UHF F/B & F/R Minimum = 14.1 dB enlarge 194KB, 1024x741 5 Vert-Stack FF4 SingleAngleRefl Deep UHF Sidelobe Nulls UHF SWR (300-ohms) Under 2.4 enlarge 234KB, 1024x741 6 Vert-Stack FF4 SingleAngleRefl Deep UHF Sidelobe Nulls UHF Impedance enlarge 299KB, 1024x1024 7 Vert-Stack FF4 SingleAngleRefl Deep UHF Sidelobe Nulls Azimuthal Pattern at 470 MHz enlarge 300KB, 1024x1024 8 Vert-Stack FF4 SingleAngleRefl Deep UHF Sidelobe Nulls Azimuthal Pattern at 530 MHz enlarge 300KB, 1024x1024 9 Vert-Stack FF4 SingleAngleRefl Deep UHF Sidelobe Nulls Azimuthal Pattern at 590 MHz enlarge 302KB, 1024x1024 10 Vert-Stack FF4 SingleAngleRefl Deep UHF Sidelobe Nulls Azimuthal Pattern at 650 MHz enlarge 302KB, 1024x1024 11 Vert-Stack FF4 SingleAngleRefl Deep UHF Sidelobe Nulls Azimuthal Pattern at 698 MHz enlarge 301KB, 1024x1024 12 Vert-Stack FF4 SingleAngleRefl Deep UHF Sidelobe Nulls Azimuthal Pattern at 806 MHz enlarge 170KB, 791x1024 13 Vert-Stack FF4 SingleAngleRefl Deep UHF Sidelobe Nulls 4nec2 File contains Summary of Dimensions enlarge 32KB, 791x1024 14 Vert-Stack FF4 SingleAngleRefl Deep UHF Sidelobe Nulls EVAL Performance Summary enlarge 109KB, 415x1024 15 Vert-Stack FF4 SingleAngleRefl Deep UHF Sidelobe Nulls Side View [1 large square = 12.5 inches] enlarge 181KB, 1024x741 16 Vert-Stack FF4 SingleAngleRefl Deep UHF Sidelobe Nulls Hi-VHF Raw Gain = 12.0 to 11.5 dBi Hi-VHF F/B & F/R Ratio Minimum = 12.7 dB enlarge 195KB, 1024x741 17 Vert-Stack FF4 SingleAngleRefl Deep UHF Sidelobe Nulls Hi-VHF SWR (300-ohms) = 73 to 26 is Excessive enlarge 223KB, 1024x741 18 Vert-Stack FF4 SingleAngleRefl Deep UHF Sidelobe Nulls Hi-VHF Impedance enlarge 304KB, 1024x1024 19 Vert-Stack FF4 SingleAngleRefl Deep UHF Sidelobe Nulls Azimuthal Pattern at 174 MHz enlarge 301KB, 1024x1024 20 Vert-Stack FF4 SingleAngleRefl Deep UHF Sidelobe Nulls Azimuthal Pattern at 198 MHz enlarge 301KB, 1024x1024 21 Vert-Stack FF4 SingleAngleRefl Deep UHF Sidelobe Nulls Azimuthal Pattern at 216 MHz
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