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Optibeam Antenna
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Optibeam - OB17-4 - 7 Element, 4 Band - 40 / 20 / 15 / 10
OB17-4
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 / 15 / 10 | |
| Gain (dBd) * | 4,8 / 7,3 / 7,8 / 8,0 | |
| Gain (dBi) ** | 11,7 / 14,9 / 15,5 / 15,8 | |
| F/B (dB) | 25 / 20 / 22 / 24 | |
| VSWR | ||
| 40 m allgemeines setting: | ||
| 7,00 - 7,05 - 7,15 | 1,7 - 1,1 - 1,9 | |
| 40 m USA phone setting: | ||
| 7,15 - 7,20 - 7,30 | 1,7 - 1,1 - 1,8 | |
| 14,00 - 14,18 - 14,35 | 1,4 - 1,1 - 1,3 | |
| 21,00 - 21,27 - 21,45 | 1,5 - 1,1 - 1,5 | |
| 28,00 - 28,59 - 29,00 | 1,5 - 1,1 - 1,4 | |
| Elements (number) | 17 | |
| Active Elements | 3 / 4 / 4 / 6 | |
| Max. Elementlength (m) | 14.6 | |
| Boomlength (m) | 11.9 | |
| Turning Radius (m) | 9.15 | |
| Feedlines (number) | 1 Coax 50 Ohm | |
| Weight (kg) | 100 | |
| Windload at 130 km/h | 1.989 N / 2,48 m² / 26,8 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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