CM4221 per Actual Measurements analyzed using 4nec2 (verified against a photo posted by mclapp): http://www.frontiernet.net/~mclapp/Antennas/CM4221/CM4221%20front.jpg
BowLength = 8.5-in, Bowtie Spacing = 8.9-in, Tine Separation = 5.25-in. All AWG8. Feedline Separation = 1.4-in, with 0.8-in at Crossover. All AWG8 wire size (0.125" O.D.). Center of Crossovers 2.75-in from Center of Outer Bowties.
Date(s): 23Aug2009. Album by holl_ands. 1 - 11 of 11 Total. 11953 Visits.
enlarge 0KB, 680x1024 1 CM4221 4-Bay (NO Reflector) - Front View Per Actual Measurements [Each Small Box = 0.5-inch]
enlarge 0KB, 125x1024 2 CM4221 4-Bay (NO Reflector) - Side View Per Actual Measurements [Each Small Box = 0.5-inch]
enlarge 0KB, 203x1024 3 CM4221 4-Bay (NO Reflector) - Top View Per Actual Measurements [Each Small Box = 0.5-inch]
enlarge 0KB, 1024x819 4 CM4221 4-Bay (NO Reflector) - UHF Raw Gain Per Actual Measurements
8.3 rising to 11.9 dBi in New UHF Band.
enlarge 0KB, 1024x819 5 CM4221 4-Bay (NO Reflector) - SWR(300-ohm) Per Actual Measurements
Poor SWR at Low UHF Freqs (Land Mobile)
enlarge 0KB, 1024x819 6 CM4221 4-Bay (NO Reflector) - UHF Impedance Per Actual Measurements
enlarge 0KB, 1024x819 7 CM4221 4-Bay (NO Reflector) - Hi-VHF Raw Gain Per Actual Measurements
Constant 3.8 dBi Gain.
enlarge 0KB, 1024x819 8 CM4221 4-Bay (NO Reflector) - Hi-VHF SWR(300-ohm) Per Actual Measurements
Good SWR for Ch11-13, Poor for Ch7-9.
enlarge 0KB, 1024x819 9 CM4221 4-Bay (NO Reflector) - Hi-VHF Impedance Per Actual Measurements
enlarge 32KB, 791x1024 10 4nec2 File for CM4221 4-Bay (NO Reflector) Per Actual Measurements SYmbols makes it easy to vary parameters.
enlarge 0KB, 768x1024 11 CM4221 Hung from the Rafters
Note Reflector Screen flare is to the Rear for slightly wider Beamwidth.
