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Hi-VHF+UHF Bowtie-In-Loop + 11RR - OPT
Hi-VHF+UHF Bowtie-in-Loop (BIL) with 11 Reflector Rods analyzed using 4nec2.  Dimensions were
determined using nikiml's Python Optimization Scripts.  Two separate sets of Reflector Rods with
different Lengths & Separation from BIL were assumed to Optimize Hi-VHF & UHF, using different
Min/Max search ranges.

UHF Min & Max Raw Gain: 8.7 & 10.4 dBi, F/B & F/R Ratio Min = 11.0 dB and SWR (300-ohms) under 3.2.
HiVHF Raw Gain: 7.1 to 6.9 dBi, F/B & F/R Ratio Min = 14.9 dB and SWR (300-ohms) 6.7 to 2.6, which
is excessive on the mid to lower channels but may be acceptable in many situations.
Date(s): 23 Sept 2013. Album by holl_ands. 1 - 23 of 23 Total. 7457 Visits.
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Hi-VHF+UHF Bowtie-In-Loop + 11RR
3D View


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Front View
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Top View
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UHF Min & Max Raw Gain: 8.7 & 10.4 dBi
UHF F/B & F/R Ratio Minimum = 11.0 dB


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UHF SWR (300-ohms) Under 3.2
Poor on the lowest channels


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UHF Impedance


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Azimuthal Pattern on 470 MHz


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Azimuthal Pattern on 530 MHz


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Azimuthal Pattern on 590 MHz


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Azimuthal Pattern on 650 MHz


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Azimuthal Pattern on 698  MHz


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Azimuthal Pattern on 758  MHz


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Azimuthal Pattern on 806 MHz


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Hi-VHF+UHF Bowtie-In-Loop + 11RR
4nec2 File


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Side View
[1 large square = 2.5 inches]


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HiVHF Raw Gain: 7.1 to 6.9 dBi
Hi-VHF F/B & F/R Ratio Minimum = 14.9 dB


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Hi-VHF SWR (300-ohms) = 6.7 to 2.6
Excessive on low-mid channels


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Hi-VHF Impedance


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Azimuthal Pattern on 174 MHz


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Azimuthal Pattern on 198 MHz


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Azimuthal Pattern on 216 MHz


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Hi-VHF+UHF Bowtie-In-Loop + 11RR
Contents of Python Control *.bat (text) file


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Save_Population_For_Restart *.bat Contents
[Can manually execute every few hours.]


 
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