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Optibeam Antenna
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Optibeam - OB12-4W - 12 Element, 4 Band - 40 / 20 / 17 / 15
OB12-4W
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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More info
| Bands | 40 / 20 / 17 / 15 | |
| Gain (dBd) * | 3,6 / 5,4 / 5,6 / 6,8 | |
| Gain (dBi) ** | 10,5 / 12,8 / 13,2 / 14,4 | |
| F/B (dB) | 15 / 22 / 25 / 21 | |
| VSWR | ||
| 40 m CW/Europe setting: | ||
| 7,00 - 7,05 - 7,15 | 1,6 - 1,1 - 1,8 | |
| 40 m USA phone setting: | ||
| 7,15 - 7,20 - 7,30 | 1,6 - 1,1 - 1,8 | |
| 14,00 - 14,18 - 14,35 | 1,4 - 1,1 - 1,4 | |
| 18,07 - 18,14 - 18,17 | 1,2 - 1,2 - 1,2 | |
| 21,00 - 21,23 - 21,45 | 1,4 - 1,1 - 1,3 | |
| Elements (number) | 12 | |
| Active Elements | 2 / 3 / 3 / 4 | |
| Max. Elementlength (m) | 14.96 | |
| Boomlength (m) | 8.1 | |
| Turning Radius (m) | 8.5 | |
| Feedlines (number) | 1 Coax 50 Ohm | |
| Weight (kg) | 74 | |
| Windload at 130 km/h | 1.320 N / 1,65 m² / 17,8 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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