Hi-VHF+UHF Bowtie-In-Loop + 11RR

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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. 8306 Visits.

enlarge 83KB, 936x1024 1 Hi-VHF+UHF Bowtie-In-Loop + 11RR 3D View	enlarge 181KB, 1024x650 2 Hi-VHF+UHF Bowtie-In-Loop + 11RR Front View [1 large square = 5 inches]	enlarge 143KB, 577x1024 3 Hi-VHF+UHF Bowtie-In-Loop + 11RR Top View [1 large square = 5 inches]
enlarge 181KB, 1152x686 4 Hi-VHF+UHF Bowtie-In-Loop + 11RR UHF Min & Max Raw Gain: 8.7 & 10.4 dBi UHF F/B & F/R Ratio Minimum = 11.0 dB	enlarge 200KB, 1152x686 5 Hi-VHF+UHF Bowtie-In-Loop + 11RR UHF SWR (300-ohms) Under 3.2 Poor on the lowest channels	enlarge 244KB, 1152x686 6 Hi-VHF+UHF Bowtie-In-Loop + 11RR UHF Impedance
enlarge 301KB, 1024x1024 7 Hi-VHF+UHF Bowtie-In-Loop + 11RR Azimuthal Pattern on 470 MHz	enlarge 302KB, 1024x1024 8 Hi-VHF+UHF Bowtie-In-Loop + 11RR Azimuthal Pattern on 530 MHz	enlarge 302KB, 1024x1024 9 Hi-VHF+UHF Bowtie-In-Loop + 11RR Azimuthal Pattern on 590 MHz
enlarge 304KB, 1024x1024 10 Hi-VHF+UHF Bowtie-In-Loop + 11RR Azimuthal Pattern on 650 MHz	enlarge 305KB, 1024x1024 11 Hi-VHF+UHF Bowtie-In-Loop + 11RR Azimuthal Pattern on 698 MHz	enlarge 307KB, 1024x1024 12 Hi-VHF+UHF Bowtie-In-Loop + 11RR Azimuthal Pattern on 758 MHz
enlarge 305KB, 1024x1024 13 Hi-VHF+UHF Bowtie-In-Loop + 11RR Azimuthal Pattern on 806 MHz	enlarge 34KB, 791x1024 14 Hi-VHF+UHF Bowtie-In-Loop + 11RR 4nec2 File	enlarge 189KB, 703x1024 15 Hi-VHF+UHF Bowtie-In-Loop + 11RR Side View [1 large square = 2.5 inches]
enlarge 178KB, 1152x686 16 Hi-VHF+UHF Bowtie-In-Loop + 11RR HiVHF Raw Gain: 7.1 to 6.9 dBi Hi-VHF F/B & F/R Ratio Minimum = 14.9 dB	enlarge 206KB, 1152x686 17 Hi-VHF+UHF Bowtie-In-Loop + 11RR Hi-VHF SWR (300-ohms) = 6.7 to 2.6 Excessive on low-mid channels	enlarge 234KB, 1152x686 18 Hi-VHF+UHF Bowtie-In-Loop + 11RR Hi-VHF Impedance
enlarge 308KB, 1024x1024 19 Hi-VHF+UHF Bowtie-In-Loop + 11RR Azimuthal Pattern on 174 MHz	enlarge 304KB, 1024x1024 20 Hi-VHF+UHF Bowtie-In-Loop + 11RR Azimuthal Pattern on 198 MHz	enlarge 304KB, 1024x1024 21 Hi-VHF+UHF Bowtie-In-Loop + 11RR Azimuthal Pattern on 216 MHz
enlarge 26KB, 791x1024 22 Hi-VHF+UHF Bowtie-In-Loop + 11RR Contents of Python Control *.bat (text) file	enlarge 22KB, 791x1024 23 Save_Population_For_Restart *.bat Contents [Can manually execute every few hours.]

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Verity Details.
Best happy belated birthday.
- Dela, Sat, 18 Mar 2023 9:44AM