UHF "Figure-8" Twin-Loops + xxRR

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UHF "Figure-8" Twin-Loops + xxRR - OPT

UHF "Figure-8" Twin-Loops + 11 (also 3) Reflector Rods analyzed using 4nec2 after determining
dimensions using nikiml's Python Optimization Scripts.

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a) Twin-Hoops + 11 Reflector Rods:
UHF Raw Gain = 9.7 to 10.9 dBi, F/B & F/R Ratio Min. = 18.1 dB and SWR (300-ohms) Under 2.2.
Hi-VHF Raw Gain = 5.3 to 6.0 dBi, F/B & F/R = 1.3 to 19.7 dB is Bi-Directional on Lower Channels
and SWR (300-ohms) = 752 to 92 is Excessive.

SUMMARY OF DIMENSIONS (to nearest 1/8-in):
Loop Diameter = 9.125-in,
Reflector Rod Separation behind Hourglass = RS = 4.5-in,
Reflector Rod-to-Rod Separation = RR = 2.125-in,
Reflector Rod Half-Lengths = YRod = 9.875-in.

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b) Twin-Hoops + 3 Reflector Rods:
UHF Raw Gain = 8.3 to 10.0 dBi, F/B & F/R = 8.9 to 10.2 dB and SWR (300-ohms) Under 1.0.
Hi-VHF Raw Gain = 4.1 to 5.2 dBi, F/B & F/R Ratio = 3.1 to 13.7 dB and SWR (300-ohms) = 673 to 43 is Excessive.

SUMMARY OF DIMENSIONS (to nearest 1/8-in):
Loop Diameter = 9.125-in,
Reflector Rod Separation behind Hourglass = RS = 4.0-in,
Reflector Rod-to-Rod Separation = RR = 4.625-in,
Reflector Rod Half-Lengths = YRod = 11.25-in (are WIDER than 11RR).

Date(s): 6 Mar 2015. Album by holl_ands. 1 - 42 of 42 Total. 8194 Visits.

enlarge 130KB, 905x1024 1 UHF "Figure-8" Twin-Loops + 11RR 3D View	enlarge 254KB, 849x1024 2 UHF "Figure-8" Twin-Loops + 11RR Front View [1 large square = 2.5 inches]	enlarge 144KB, 598x1024 3 UHF "Figure-8" Twin-Loops + 11RR Top View [1 large square = 2.5 inches]
enlarge 169KB, 1024x677 4 UHF "Figure-8" Twin-Loops + 11RR UHF Raw Gain = 9.7 to 10.9 dBi UHF F/B & F/R Ratio Min. = 18.1 dB	enlarge 171KB, 1024x677 5 UHF "Figure-8" Twin-Loops + 11RR UHF SWR (300-ohms) Under 2.2	enlarge 225KB, 1024x741 6 UHF "Figure-8" Twin-Loops + 11RR UHF Impedance
enlarge 299KB, 1024x1024 7 UHF "Figure-8" Twin-Loops + 11RR Azimuthal Pattern at 470 MHz	enlarge 298KB, 1024x1024 8 UHF "Figure-8" Twin-Loops + 11RR Azimuthal Pattern at 530 MHz	enlarge 298KB, 1024x1024 9 UHF "Figure-8" Twin-Loops + 11RR Azimuthal Pattern at 590 MHz
enlarge 299KB, 1024x1024 10 UHF "Figure-8" Twin-Loops + 11RR Azimuthal Pattern at 650 MHz	enlarge 299KB, 1024x1024 11 UHF "Figure-8" Twin-Loops + 11RR Azimuthal Pattern at 698 MHz	enlarge 296KB, 1024x1024 12 UHF "Figure-8" Twin-Loops + 11RR Azimuthal Pattern at 758 MHz
enlarge 297KB, 1024x1024 13 UHF "Figure-8" Twin-Loops + 11RR Azimuthal Pattern at 806 MHz	enlarge 32KB, 791x1024 14 UHF "Figure-8" Twin-Loops + 11RR 4nec2 File contains Summary of Dimensions	enlarge 135KB, 507x1024 15 UHF "Figure-8" Twin-Loops + 11RR Side View [1 large square = 2.5 inches]
enlarge 169KB, 1024x741 16 UHF "Figure-8" Twin-Loops + 11RR Hi-VHF Raw Gain = 5.3 to 6.0 dBi Hi-VHF F/B & F/R = 1.3 to 19.7 dB is Bi-Directional on Lower Channels	enlarge 186KB, 1024x741 17 UHF "Figure-8" Twin-Loops + 11RR Hi-VHF SWR (300-ohms) = 752 to 92 is Excessive	enlarge 240KB, 1024x741 18 UHF "Figure-8" Twin-Loops + 11RR Hi-VHF Impedance
enlarge 303KB, 1024x1024 19 UHF "Figure-8" Twin-Loops + 11RR Azimuthal Pattern at 174 MHz	enlarge 303KB, 1024x1024 20 UHF "Figure-8" Twin-Loops + 11RR Azimuthal Pattern at 198 MHz	enlarge 305KB, 1024x1024 21 UHF "Figure-8" Twin-Loops + 11RR Azimuthal Pattern at 216 MHz
enlarge 87KB, 1024x809 22 UHF "Figure-8" Twin-Loops + 3RR 3D View	enlarge 217KB, 1024x748 23 UHF "Figure-8" Twin-Loops + 3RR Front View [1 large square = 2.5 inches]	enlarge 151KB, 583x1024 24 UHF "Figure-8" Twin-Loops + 3RR Top View [1 large square = 2.5 inches]
enlarge 178KB, 1024x722 25 UHF "Figure-8" Twin-Loops + 3RR UHF Raw Gain = 8.3 to 10.0 dBi UHF F/B & F/R = 8.9 to 10.2 dB	enlarge 186KB, 1024x722 26 UHF "Figure-8" Twin-Loops + 3RR UHF SWR (300-ohms) Under 1.9	enlarge 221KB, 1024x722 27 UHF "Figure-8" Twin-Loops + 3RR UHF Impedance
enlarge 305KB, 1024x1024 28 UHF "Figure-8" Twin-Loops + 3RR Azimuthal Pattern at 470 MHz	enlarge 303KB, 1024x1024 29 UHF "Figure-8" Twin-Loops + 3RR Azimuthal Pattern at 530 MHz	enlarge 303KB, 1024x1024 30 UHF "Figure-8" Twin-Loops + 3RR Azimuthal Pattern at 590 MHz
enlarge 302KB, 1024x1024 31 UHF "Figure-8" Twin-Loops + 3RR Azimuthal Pattern at 650 MHz	enlarge 308KB, 1024x1024 32 UHF "Figure-8" Twin-Loops + 3RR Azimuthal Pattern at 698 MHz	enlarge 305KB, 1024x1024 33 UHF "Figure-8" Twin-Loops + 3RR Azimuthal Pattern at 806 MHz
enlarge 169KB, 1024x722 34 UHF "Figure-8" Twin-Loops + 3RR Hi-VHF Raw Gain = 4.1 to 5.2 dBi Hi-VHF F/B & F/R Ratio = 3.1 to 13.7 dB	enlarge 196KB, 1024x722 35 UHF "Figure-8" Twin-Loops + 3RR Hi-VHF SWR (300-ohms) = 673 to 43 is Excessive	enlarge 243KB, 1024x722 36 UHF "Figure-8" Twin-Loops + 3RR Hi-VHF Impedance
enlarge 302KB, 1024x1024 37 UHF "Figure-8" Twin-Loops + 3RR Azimuthal Pattern at 174 MHz	enlarge 301KB, 1024x1024 38 UHF "Figure-8" Twin-Loops + 3RR Azimuthal Pattern at 198 MHz	enlarge 305KB, 1024x1024 39 UHF "Figure-8" Twin-Loops + 3RR Azimuthal Pattern at 216 MHz
enlarge 140KB, 598x1024 40 UHF "Figure-8" Twin-Loops + 3RR Side View [1 large square = 2.5 inches]	enlarge 32KB, 791x1024 41 UHF "Figure-8" Twin-Loops + 3RR 4nec2 File Contains Summary of Dimensions	enlarge 29KB, 791x1024 42 UHF "Figure-8" Twin-Loops + 3RR EVAL *.html File Performance Summary