UHF (16-Elements Total) Vertically Stacked 8-Element Folded Dipole Yagis with 2 Reflector Rods each analyzed using 4nec2.
All dimensions were determined using nikiml's Optimization Python Scripts.
UHF Raw Gain = 11.3 to 14.5 dBi, F/B & F/R Ratio Minimum = 22.2 dB and SWR Under 3.0.
EDIT (27Jun2013): Updated Charts with improved results for Stacked 8-El FD-Yagis (w 2-Reflector Rods). Newer version has 1+ dB improvement in Gain and F/R Ratio. Vertical Stacking Distance = 40-inches.
EDIT (11Nov2018): Added Performance Charts for 470, 584 and 698 MHz, varying Vertical Stacking Distance from 10 to 110-inches [where VSD = 2 * Zyag]. Note that the "Sweet Spot" for Raw Gain (+/- a few tenths of a dB) and SWR was for Vertical Stacking Distance between 30 and 40-in (Zyag from about 15 to 20-in). Across ALL Freqs, Optimizer determined VSD=40-in.
Date(s): 23 Jun 2013. Album by holl_ands. 1 - 28 of 28 Total. 3265 Visits.
enlarge 81KB, 560x1024 1 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT 3D View
enlarge 159KB, 604x1024 2 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT Side View [1 large square = 5 inches]
enlarge 189KB, 1024x713 3 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT Top View [1 large square = 2.5 inches]
enlarge 180KB, 1152x678 4 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT UHF Raw Gain = 11.3 to 14.5 dBi F/B & F/R Minimum = 22.2 dB
enlarge 198KB, 1152x678 5 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT UHF SWR (300-ohms) Under 3.0
enlarge 253KB, 1152x678 6 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT UHF Impedance
enlarge 300KB, 1024x1024 7 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT Azimuthal Pattern at 470 MHz
enlarge 300KB, 1024x1024 8 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT Azimuthal Pattern at 530 MHz
enlarge 302KB, 1024x1024 9 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT Azimuthal Pattern at 590 MHz
enlarge 303KB, 1024x1024 10 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT Azimuthal Pattern at 650 MHz
enlarge 302KB, 1024x1024 11 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT Azimuthal Pattern at 698 MHz
enlarge 301KB, 1024x1024 12 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT Azimuthal Pattern at 806 MHz
enlarge 294KB, 1024x1024 13 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT Elevation Pattern at 470 MHz
enlarge 300KB, 1024x1024 14 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT Elevation Pattern at 590 MHz
enlarge 298KB, 1024x1024 15 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT Elevation Pattern at 698 MHz
enlarge 31KB, 791x1024 16 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT 4nec2 File
enlarge 1KB, 791x1024 17 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT Contents of Python Control *.bat File
enlarge 101KB, 347x1024 18 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT Front View [1 large square = 5 inches]
enlarge 160KB, 1024x645 19 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT Raw Gain at 470 MHz Sweep Zyag = 5 to 55-in
enlarge 179KB, 1024x645 20 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT SWR(300-ohms) at 470 MHz Sweep Zyag = 5 to 55-in
enlarge 223KB, 1024x645 21 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT Impedance at 470 MHz Sweep Zyag = 5 to 55-in
enlarge 157KB, 1024x645 22 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT Raw Gain at 584 MHz Sweep Zyag = 5 to 55-in
enlarge 189KB, 1024x645 23 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT SWR(300-ohms) at 584 MHz Sweep Zyag = 5 to 55-in
enlarge 228KB, 1024x645 24 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT Impedance at 584 MHz Sweep Zyag = 5 to 55-in
enlarge 168KB, 1024x645 25 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT Raw Gain at 698 MHz Sweep Zyag = 5 to 55-in
enlarge 192KB, 1024x645 26 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT SWR(300-ohms) at 698 MHz Sweep Zyag = 5 to 55-in
enlarge 219KB, 1024x645 27 UHF V-Stack 8-El FD-Yagi with 2RR ea - OPT Impedance at 698 MHz Sweep Zyag = 5 to 55-in
enlarge 256KB, 1024x696 28 Compare UHF Raw Gain and F/R Ratios for: M4(10x9.5) 4-Bay, CM4228HD 8-Bay, Vertically Stacked 8-El Yagis, 15-El Double-Quad Yagi, 7-El Quagi and 7-El Bi-Quad Yagi.
