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Optibeam Antenna
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Optibeam - OB18-6 - 18 Element Yagi 40-20-17-15-12-10m
OB18-6
New product
As you know the Yagi as a symmetrical structure must always be fed using a balun at the feed point, otherwise the performance will be significantly lost.
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| Bands | 40 / 20 / 17 / 15 / 12 / 10 | |
| Gain (dBd) * | 4,8 / 7,3 / 7,5 / 7,8 / 7,0 / 7,7 | |
| Gain (dBi) ** | 11,8 / 14,7 / 15,1 / 15,5 / 14,8 / 15,6 | |
| F/B (dB) | 25 / 18 / 25 / 22 / 22 / 15 | |
| VSWR | ||
| 40 m CW/Europe setting: | ||
| 7,00 - 7,05 - 7,15 | 1,7 - 1,1 - 1,8 | |
| 40 m USA phone setting: | ||
| 7,15 - 7,21 - 7,30 | 1,7 - 1,1 - 1,8 | |
| 14,000 - 14,160 - 14,350 | 1,3 - 1,1 - 1,4 | |
| 18,069 - 18,150 - 18,169 | 1,4 - 1,1 - 1,2 | |
| 21,000 - 21,270 - 21,450 | 1,4 - 1,1 - 1,3 | |
| 24,890 - 24,950 - 24,990 | 1,3 - 1,1 - 1,3 | |
| 28,000 - 28,500 - 29,000 | 1,5 - 1,1 - 1,7 | |
| Elements (number) | 18 (+ 8 hidden sleeve für 12/17m ) | |
| Active Elements | 3 / 4 / 4 / 4 / 4 / 7 | |
| Max. Elementlength (m) | 14.64 | |
| Boomlength (m) | 11.9 | |
| Turning Radius (m) | 9.16 | |
| Feedlines (number) | 1 Coax 50 Ohm | |
| Weight (kg) | 120 | |
| Windload at 130 km/h | 2.466 N / 3,09 m² / 33,37 feet² | |
| * = average gain over dipol in free-space / for comparison: 2 el monobander 4 dBd, 3 el 5-6 dBd |
| ** = average gain at 20m above ground (= dBd + 2.15 dB isotropic + about 5 dB ground reflection) |
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