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Optibeam Antenna
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Optibeam - OBLY25-5 - 25 Element Log Yagi 20-17-15-12-10m
OBLY25-5
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 | 20 / 17 / 15 / 12 / 10 | |
| Gain (dBd) * | 7,4 / 7,4 / 7,4 / 7,4 / 7,4 | |
| Gain (dBi) ** | 14,7 / 14,8 / 15,0 / 15,0 / 15,1 | |
| Practical performance (due to active radiation area) |
like 4.5el monoband Yagi | |
| F/B (dB) | 37 / 40 / 40 / 35 / 28 | |
| SWR | all band ranges < 1.5 | |
| Elements (number) | 25 | |
| Active elements | between 70 and 100% of the entire antenna area operative | |
| Max. element length (m) | 11,04 | |
| Boom length (m) | 21,00 | |
| Turning radius (m) | 11,40 | |
| Feed lines (number) | 1 Coax 50 Ohm | |
| Weight (kg) | 165 | |
| Windload at 130 km/h | 2.385 N / 3,00 m2 / 32,17 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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