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holl_ands | Home > Multi-Bay Bowtie Antennas > UHF 4-Bay Bowties - NO Reflectors > Browse:NEW-UHF Free-Form 4-Bay + NoReflComparison Charts: 4-Bay - NO ReflectorsUHF Free-Form 4-Bay Bowtie - NO Reflmclapp's M4 (10.0x9.5) 4-Bay - NO Refl.UHF Kosmic SuperQuad (9.75x9.5) NO Refl.mclapp's M4 (9.5x9.0) 4-Bay - NO Refl.mclapp M4 (9.5x9.0x8.5) 4-Bay - NO ReflUHF CM4221HD (Hacked) - No ReflectorCM4221 Actual Measurements - if NO ReflCM4221a.ez 4-Bay Bowtie - if NO ReflAntennacraft U-4000 - NO Reflector A-D DB-4 4-Bay Bowtie NO ReflectorUTube 4-Bay Bowtie - NO Reflector
UHF CM4221HD (Hacked) - No Reflector UHF CM4221HD (Hacked) and NO Reflector analyzed using 4nec2. CM4221HD measurements per fol. smpowell55 posts: http://www.digitalhome.ca/forum/showthread.php?p=863127 http://www.digitalhome.ca/forum/showthread.php?p=863559 UHF Raw Gain = 7.4 to 12.2 dBi and SWR (300-ohms) under 2.6. Hi-VHF Raw Gain = 4.1 to 4.2 dBi and SWR (300-ohms) = 17 to 1.1. SWR on Ch7-10 degrades Net Gain & EVM (Error Vector Magnitude), but may be adequate for strong stations. NOTE: As-shipped PCB Balun KILLS VHF.  Above Hi-VHF performance presumes replace with conventional Transformer (Cylindrical) Balun. BowLength = 7.9-in, Inner-Inner Bowtie Spacing = 9.84-in, Outer-Inner Bowtie Spacing = 8.46-in, Tine Separation = 3.94-in.  Feedline Separation = 1.18-in, with 0.8-in at Crossover (2" from Outer Bowtie). 16 Rod Reflectors: 23.6" Long with 1.93" Spacings for Total Height = 30-in.  Separation from Bowties = 4.25-in. It is presumed that anyone interested enough to view this webpage will implement the "Hacked Balun" modifications per photo in fol. rabbit73 post (flip over the Feedlines going into the Balun plus an additional offset): http://www.digitalhome.ca/forum/showthread.php?p=1167870 Date(s): 18 Oct 2013. Album by holl_ands. 1 - 21 of 21 Total. 9627 Visits.
enlarge 52KB, 451x1024 1 UHF CM4221HD (Hacked) - No Reflector 3D View enlarge 201KB, 611x1024 2 UHF CM4221HD (Hacked) - No Reflector Front View [1 large square = 2.5 inches] enlarge 118KB, 539x1024 3 UHF CM4221HD (Hacked) - No Reflector Top View [1 large square = 2.5 inches] enlarge 175KB, 1152x686 4 UHF CM4221HD (Hacked) - No Reflector UHF Raw Gain = 7.4 to 12.2 dBi enlarge 209KB, 1152x686 5 UHF CM4221HD (Hacked) - No Reflector UHF SWR (300-ohms) Under 2.6 enlarge 248KB, 1152x686 6 UHF CM4221HD (Hacked) - No Reflector UHF Impedance enlarge 304KB, 1024x1024 7 UHF CM4221HD (Hacked) - No Reflector Azimuthal Pattern at 470 MHz enlarge 303KB, 1024x1024 8 UHF CM4221HD (Hacked) - No Reflector Azimuthal Pattern at 530 MHz enlarge 303KB, 1024x1024 9 UHF CM4221HD (Hacked) - No Reflector Azimuthal Pattern at 590 MHz enlarge 306KB, 1024x1024 10 UHF CM4221HD (Hacked) - No Reflector Azimuthal Pattern at 650 MHz enlarge 306KB, 1024x1024 11 UHF CM4221HD (Hacked) - No Reflector Azimuthal Pattern at 698 MHz enlarge 304KB, 1024x1024 12 UHF CM4221HD (Hacked) - No Reflector Azimuthal Pattern at 758 MHz enlarge 308KB, 1024x1024 13 UHF CM4221HD (Hacked) - No Reflector Azimuthal Pattern at 806 MHz enlarge 95KB, 308x1024 14 UHF CM4221HD (Hacked) - No Reflector Side View [1 large square = 2.5 inches] enlarge 33KB, 791x1024 15 UHF CM4221HD (Hacked) - No Reflector 4nec2 File enlarge 179KB, 1152x686 16 UHF CM4221HD (Hacked) - No Reflector Hi-VHF Raw Gain = 4.1 to 4.2 dBi enlarge 213KB, 1152x686 17 UHF CM4221HD (Hacked) - No Reflector Hi-VHF SWR (300-ohms) = 17 to 1.1 Excessive on Ch7-10 enlarge 241KB, 1152x686 18 UHF CM4221HD (Hacked) - No Reflector Hi-VHF Impedance enlarge 310KB, 1024x1024 19 UHF CM4221HD (Hacked) - No Reflector Azimuthal Pattern at 174 MHz enlarge 311KB, 1024x1024 20 UHF CM4221HD (Hacked) - No Reflector Azimuthal Pattern at 198 MHz enlarge 314KB, 1024x1024 21 UHF CM4221HD (Hacked) - No Reflector Azimuthal Pattern at 216 MHz
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