曾经想设计的一个MOXON混合结构的天线，有成品实例了
OB8-4M 8 Element 4 Band
The OB8-4M is an extremely effective, compact and innovative Yagi for the classical four bands 40, 20, 15 and 10m. It is the first trapless Yagi for this frequency spectrum in the world with a single 50 Ohm coaxial feed and with two powerful Moxon
Rectangles integrated in its design to improve performance. A
mechanically brilliant power house without compromise, the next
level of antenna performance!
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usage of all advantages of the 2 element loaded Moxon Yagi for 40m, see OB2-40M
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on 20m a 2 element full size Moxon allows for outstanding gain and a super radiation pattern with extremely high F/B
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2 fully resonant active elements on 15m are additionally enhanced by the 10m director in front which results in an increase of gain and an optimised radiation
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a driver-director combination on 10m already delivers higher gain and F/B ratio figures which are increased close to the values of a 3 element monobander due to additional positive effects of the 15m elements in the rear
| OB8-4M |
8 Element, 4 Band |
| Bands |
40 / 20 / 15 / 10 |
| Gain (dBd) * |
3,5 / 4,2 / 4,4 / 4,9 |
| Gain (dBi) ** |
10,7 / 11,4 / 11,6 / 12,1 |
| F/B (dB) |
18 / 25 / 20 / 28 |
| VSWR |
|
| 40 m allgemeines setting: |
|
| 7,00 - 7,05 - 7,10 - 7,30 |
1,6 - 1,15 - 1,3 - 1,9 |
| 40 m USA phone setting: |
|
| 7,15 - 7,20 - 7,30 |
1,5 - 1,15 - 1,4 |
| 14,00 - 14,18 - 14,35 |
1,5 - 1,1 - 1,4 |
| 21,00 - 21,25 - 21,45 |
1,3 - 1,1 - 1,4 |
| 28,00 - 28,50 - 29,00 |
1,6 - 1,15 - 1,7 |
| Elements (number) |
8 |
| Active Elements |
2 / 2 / 2-3 / 2-3 |
| Max. Elementlength (m) |
10.52 |
| Boomlength (m) |
6.1 |
| Turning Radius (m) |
6.12 |
| Feedlines (number) |
1 Coax 50 Ohm |
| Weight (kg) |
45 |
| Windload at 130 km/h |
970 N / 1,20 m² / 13,0 feet² |
|
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