6-(9)-Band-DK7ZB-Wirebeam
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This wire-beam has one radiator-element, fed with 450-Ohm-Wireman-twinlead and needs an antenna-tuner. For the bands 6m, 10m, 12m, 15m, 17m and 20m bended reflector-elements are used. The gain in these bands is 4dBd (50MHz 2dBd). It is possible to use the antenna on 30m, 40m and 80m, too. The support is a cross of 4 fibreglass-fishing-rods, each has a length of 4,50m. The schematic: All wires 1mm copper, not insulated (very important!) Plots with EZNEC+4 of W7EL |
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Radiator: wire 1=8.00m wires 2, 3=1.11m total length=10.22m center fed Reflector 20m: wire 4=8.00m wires 5,6=1.29m total length=10.58m distance=3.60m Reflector 17m: wire10=6.40m wires 11, 12=0.93m total length=8.26m distance=3.20m Reflector 15m: wire 7=5,34m wires 8, 9=0,58m total length=6.50m distance=3.00m Reflector 12m: wire 16=5.00m wires 17, 18=0.60m total length=6.20 distance=2.40m Reflector 10m: wire 13=4.60m wires 14, 15=0.37m total length=5.34m distance=2.10m Reflector 6m: wire 19=2.97m distance=1.40m |
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50,1 MHz Azimuth, free space Gain 2,4dBd F/B 4,12dB
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50,1 MHz Elevation, 10m above ground Gain 1,1dBd at 8°
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28,3 MHz Azimuth, free space Gain 4,3dBd F/B 7,8dB
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28,3 MHz Elevation, 10m above ground Gain 9,6dBd at 15°
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24,9 MHz Azimuth, free space Gain 4,5dBd F/B 7,6dB
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24,9 MHz Elevation, 10m above ground Gain 9,4dBd at 19°
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21,0 MHz Azimuth, free space Gain 4,3dBd F/B 7dB
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21,0 MHz Elevation, 10m above ground Gain 9,4dBd at 19°
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18,1 MHz Azimuth, free space Gain 4,4dBd F/B 8,6dB
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18,1 MHz Elevation, 10m above ground Gain 9,7dBd at 22°
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14,15 MHz Azimuth, free space Gain 4,3dBd F/B 12,1dB
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14,15 MHz Elevation, 10m above ground Gain 8,6dBd at 28°
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10,1 MHz Azimuth, free space Gain 0,3dBd F/B 1dB Maximum at 180°!
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10,1 MHz Elevation, 10m above ground Gain 3,7dBd at 139°
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7,05 MHz Azimuth, free space Gain -0,2dBd
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7,05 MHz Elevation, 10m above ground Gain 3,7dBd at 114°
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3,65 MHz Azimuth, free space Gain -0,35dBd
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3,65 MHz Elevation, 10m above ground Gain 5,9dBd at 90° |
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For Fieldday-use you get a low-band DX-antenna, if you feed the Wireman-cable parallel against a set of radials on the ground as a top-loaded vertical. This option is interesting from 30-160m. The Elevation patterns against a ground with medium conductivity are plotted below: |
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160m
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1,83 MHz 4 - j 655 Ohm Gain -1,35dBd Max. 25°
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80m
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3,5 MHz 16 - j 131 Ohm Gain -1,71dBd Max. 26° |
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40m
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7,05 MHz 205 + j 815 Ohm Gain -2,45dBd Max. 25°
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30m
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10,1 MHz 534 - j 1745 Ohm Gain -2,44dBd Max. 20° |
