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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.

=====================================
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.

=====================================
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. 0 Visits.
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UHF "Figure-8" Twin-Loops + 11RR
3D View


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UHF "Figure-8" Twin-Loops + 11RR
Front View
[1 large square = 2.5 inches]


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UHF "Figure-8" Twin-Loops + 11RR
Top View
[1 large square = 2.5 inches]


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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


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UHF "Figure-8" Twin-Loops + 11RR
UHF SWR (300-ohms) Under 2.2


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UHF "Figure-8" Twin-Loops + 11RR
UHF Impedance


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UHF "Figure-8" Twin-Loops + 11RR
Azimuthal Pattern at 470 MHz


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UHF "Figure-8" Twin-Loops + 11RR
Azimuthal Pattern at 530 MHz


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UHF "Figure-8" Twin-Loops + 11RR
Azimuthal Pattern at 590 MHz


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UHF "Figure-8" Twin-Loops + 11RR
Azimuthal Pattern at 650 MHz


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UHF "Figure-8" Twin-Loops + 11RR
Azimuthal Pattern at 698 MHz


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UHF "Figure-8" Twin-Loops + 11RR
Azimuthal Pattern at 758 MHz


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UHF "Figure-8" Twin-Loops + 11RR
Azimuthal Pattern at 806 MHz


Enlarge Microsoft Word Document 14
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DOC14
UHF "Figure-8" Twin-Loops + 11RR
4nec2 File contains Summary of Dimensions


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UHF "Figure-8" Twin-Loops + 11RR
Side View
[1 large square = 2.5 inches]


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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


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UHF "Figure-8" Twin-Loops + 11RR
Hi-VHF SWR (300-ohms) = 752 to 92
is Excessive


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UHF "Figure-8" Twin-Loops + 11RR
Hi-VHF Impedance


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UHF "Figure-8" Twin-Loops + 11RR
Azimuthal Pattern at 174 MHz


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UHF "Figure-8" Twin-Loops + 11RR
Azimuthal Pattern at 198 MHz


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UHF "Figure-8" Twin-Loops + 11RR
Azimuthal Pattern at 216 MHz


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UHF "Figure-8" Twin-Loops + 3RR
3D View


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UHF "Figure-8" Twin-Loops + 3RR
Front View
[1 large square = 2.5 inches]


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UHF "Figure-8" Twin-Loops + 3RR
Top View
[1 large square = 2.5 inches]


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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


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UHF "Figure-8" Twin-Loops + 3RR
UHF SWR (300-ohms) Under 1.9


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UHF "Figure-8" Twin-Loops + 3RR
UHF Impedance


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UHF "Figure-8" Twin-Loops + 3RR
Azimuthal Pattern at 470 MHz


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UHF "Figure-8" Twin-Loops + 3RR
Azimuthal Pattern at 530 MHz


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UHF "Figure-8" Twin-Loops + 3RR
Azimuthal Pattern at 590 MHz


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UHF "Figure-8" Twin-Loops + 3RR
Azimuthal Pattern at 650 MHz


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UHF "Figure-8" Twin-Loops + 3RR
Azimuthal Pattern at 698 MHz


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UHF "Figure-8" Twin-Loops + 3RR
Azimuthal Pattern at 806 MHz


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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


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UHF "Figure-8" Twin-Loops + 3RR
Hi-VHF SWR (300-ohms) = 673 to 43 is Excessive


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UHF "Figure-8" Twin-Loops + 3RR
Hi-VHF Impedance


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UHF "Figure-8" Twin-Loops + 3RR
Azimuthal Pattern at 174 MHz


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UHF "Figure-8" Twin-Loops + 3RR
Azimuthal Pattern at 198 MHz


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UHF "Figure-8" Twin-Loops + 3RR
Azimuthal Pattern at 216 MHz


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UHF "Figure-8" Twin-Loops + 3RR
Side View
[1 large square = 2.5 inches]


Enlarge Microsoft Word Document 41
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DOC41
UHF "Figure-8" Twin-Loops + 3RR
4nec2 File Contains Summary of Dimensions


Enlarge HTML Document 42
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HTML42
UHF "Figure-8" Twin-Loops + 3RR
EVAL *.html File Performance Summary


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