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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 4-Bay Fat Dipoles + Grid Reflector UHF 4-Bay Fat Dipoles + Grid Reflector was modeled using 4nec2 file posted by kakar133 and then modified for 3/4-Wavelenght Long Transmission Lines connected to a Common Simulated SOURCE. UHF Raw Gain = 11.0 to 13.5 dBi, F/R & F/B Min = 17.5 dB and SWR (300-ohms) under 2.0. Gain was significantly lower than W-G PR4400 (see 4nec2 results) and Characteristic Impedance was only 75-ohms, requiring the use of a 1:1 Balun, e.g. Un-Equal Length Coax Balun: http://www.hamradio.me/antennas/coax-velocity-factor.html Date(s): 20 Apr 2014. Album by holl_ands. 1 - 9 of 9 Total. 6333 Visits.
enlarge 148KB, 664x1024 1 4-Bay Fat Dipoles + Grid Reflector 3D View enlarge 183KB, 604x1024 2 4-Bay Fat Dipoles + Grid Reflector Front View [1 large square = 5 inches] enlarge 82KB, 307x1024 3 4-Bay Fat Dipoles + Grid Reflector Side View [1 large square = 5 inches] enlarge 176KB, 1024x675 4 4-Bay Fat Dipoles + Grid Reflector UHF Raw Gain = 11.0 to 13.5 dBi UHF F/R & F/B Minimum = 17.5 dB enlarge 193KB, 1024x675 5 4-Bay Fat Dipoles + Grid Reflector UHF SWR (75-ohms) is Under 2.0 EXCELLENT MATCH enlarge 184KB, 1024x675 6 4-Bay Fat Dipoles + Grid Reflector UHF SWR (300-ohms) is ABOVE 3.0 POOR MATCH enlarge 217KB, 1024x675 7 4-Bay Fat Dipoles + Grid Reflector UHF Impedance enlarge 127KB, 502x1024 8 4-Bay Fat Dipoles + Grid Reflector Top View [1 large square = 2.5 inches] enlarge 119KB, 1024x791 9 4-Bay Fat Dipoles + Grid Reflector 4nec2 File
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