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holl_ands | Home > Multi-Bay Dipole Antennas > Browse:UHF 3-Bay Fat Dipole + 16 RR - OPTUHF 3-Bay Fat Dipole + 12RR - OPTUHF 3-Bay FAT Dipoles + 12 Pair RR - OPTW-G HD-4400 4-Bay Dipole - NO ReflectorW-G HD-4400 4-Bay Dipole with ReflectorUHF 4-Bay Fat Dipoles + Grid ReflectorUHF Vertical 8-Bay Dipole - NO ReflectorUHF Vertical 8-Bay Dipoles + 43RRUHF Vert 8-Bay Dipole + 43 Pair RR - OPTWinegard HD-8800 8-Bay FAT Dipoles
UHF 3-Bay Fat Dipole + 16 RR - OPT UHF 3-Bay Fat Dipole + 16 Reflector Rods analyzed using 4nec2 after determining dimensions using nikiml's Python Optimization Scripts.  Reflector Rod-to-Rod Separation was presumed to be 2-in for an existing set of 4 ea Reflector Sub-Assemblies with 4RR each. UHF Raw Gain = 11.8 to 12.9 dBi, F/B & F/R Ratio Min = 18.8 dB and SWR (300-ohms) under 2.9. Hi-VHF Raw Gain FORWARD = 8 to 9 dBi on Ch9-13 and TO REAR = 6 to 8 dBi on Ch7-8 but SWR is Excessive. [Can reduce UHF SWR under 2.7 if RS=4.8-in with only 0.3 dB Loss on 698 MHz.] ASSUMED DIMENSIONS (all in inches): Rdip=0.4375 = Radius of Dipole Elements (7/8-in O.D. in this model) Rfeed=0.06425 = Radius of Feedline (AWG8 in this model) DSwp=0 = Dipole Forward Sweep [If any, zero in this model] Hop=1.0 = Separation at Crossovers RR=2.0 = Reflector Rod-to-Rod Separation Rrod=0.1875 = Radius of Reflector Rods OPTIMIZED DIMENSIONS (rounded to nearest 1/8-inch): DDSep=10.5 = Dipole-To-Dipole Separation DLen=5.875 = Dipole Half-Length FeedSep=2.75 = Separation between two FEEDLINE wires ZCross=2.0 = From Center of Feedline Cross-Over to Center of OUTER Dipoles RS=4.5 = Reflector Rod Separation behind Active Elements YRod=14.875 = Reflector Rod Half-Lengths Date(s): 21 Aug 2014. Album by holl_ands. 1 - 24 of 24 Total. 6618 Visits.
enlarge 73KB, 487x1024 1 UHF 3-Bay Fat Dipole + 16 RR - OPT 3D View enlarge 324KB, 1009x1024 2 UHF 3-Bay Fat Dipole + 16 RR - OPT Front View [1 large square = 2.5 inches] enlarge 102KB, 349x1024 3 UHF 3-Bay Fat Dipole + 16 RR - OPT Top View [1 large square = 2.5 inches] enlarge 169KB, 1024x690 4 UHF 3-Bay Fat Dipole + 16 RR - OPT UHF Raw Gain = 11.8 to 12.9 dBi UHF F/B & F/R Ratio Minimum = 18.8 dB enlarge 179KB, 1024x690 5 UHF 3-Bay Fat Dipole + 16 RR - OPT UHF SWR (300-ohms) Under 2.9 enlarge 216KB, 1024x690 6 UHF 3-Bay Fat Dipole + 16 RR - OPT UHF Impedance enlarge 301KB, 1024x1024 7 UHF 3-Bay Fat Dipole + 16 RR - OPT Azimuthal Pattern at 470 MHz enlarge 301KB, 1024x1024 8 UHF 3-Bay Fat Dipole + 16 RR - OPT Azimuthal Pattern at 530 MHz enlarge 300KB, 1024x1024 9 UHF 3-Bay Fat Dipole + 16 RR - OPT Azimuthal Pattern at 590 MHz enlarge 300KB, 1024x1024 10 UHF 3-Bay Fat Dipole + 16 RR - OPT Azimuthal Pattern at 650 MHz enlarge 304KB, 1024x1024 11 UHF 3-Bay Fat Dipole + 16 RR - OPT Azimuthal Pattern at 698 MHz enlarge 303KB, 1024x1024 12 UHF 3-Bay Fat Dipole + 16 RR - OPT Azimuthal Pattern at 758 MHz enlarge 310KB, 1024x1024 13 UHF 3-Bay Fat Dipole + 16 RR - OPT Azimuthal Pattern at 806 MHz enlarge 34KB, 791x1024 14 UHF 3-Bay Fat Dipole + 16 RR - OPT 4nec2 File enlarge 108KB, 359x1024 15 UHF 3-Bay Fat Dipole + 16 RR - OPT Side View [1 large square = 2.5 inches] enlarge 159KB, 1024x690 16 UHF 3-Bay Fat Dipole + 16 RR - OPT Hi-VHF Raw Gain FORWARD = 8 to 9 dBi on Ch9-13 enlarge 183KB, 1024x690 17 UHF 3-Bay Fat Dipole + 16 RR - OPT Hi-VHF Raw Gain To REAR = 6 to 8 dBi on Ch7-8 enlarge 208KB, 1024x690 18 UHF 3-Bay Fat Dipole + 16 RR - OPT Hi-VHF SWR (300-ohms) is Excessive enlarge 305KB, 1024x1024 19 UHF 3-Bay Fat Dipole + 16 RR - OPT Azimuthal Pattern at 174 MHz enlarge 309KB, 1024x1024 20 UHF 3-Bay Fat Dipole + 16 RR - OPT Azimuthal Pattern at 184.5 MHz enlarge 306KB, 1024x1024 21 UHF 3-Bay Fat Dipole + 16 RR - OPT Azimuthal Pattern at 186 MHz enlarge 307KB, 1024x1024 22 UHF 3-Bay Fat Dipole + 16 RR - OPT Azimuthal Pattern at 187.5 MHz enlarge 304KB, 1024x1024 23 UHF 3-Bay Fat Dipole + 16 RR - OPT Azimuthal Pattern at 198 MHz enlarge 303KB, 1024x1024 24 UHF 3-Bay Fat Dipole + 16 RR - OPT Azimuthal Pattern at 216 MHz
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