Optibeam Antenna

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Optibeam-OB804030x-big Triband-Yagi 80-40-30m-80multi switch View larger

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Optibeam-OB804030x-big Triband-Yagi 80-40-30m-80multi switch

OB804030X

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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   80 (multi switch) / 40 / 30
Gain (dBd)*   3,8 / 4,8 / 4,9
Gain (dBi)**   9,9 / 11,3 / 12,2
F/B (dB)   18 / 20 / 28
     
SWR (with the OptiBeam multi switch):    
80m SSB 1: 3,775 - 3,795 - 3,835   1,7 - 1,2 - 2,0
80m SSB 2: 3,735 - 3,755 - 3,800   1,7 - 1,2 - 2,0
80m SSB 3: 3,695 - 3,715 - 3,760   1,7 - 1,2 - 2,0
80m CW: 3,500 - 3,518 - 3,560   1,7 - 1,3 - 2,0
40m: 7,000 - 7,090 - 7,200   1,7 - 1,1 - 2,0
30m: 10,100 - 10,125 - 10,150   1,3 - 1,1 - 1,2
     
Elements (number)   8
Active Elements   2 / 3 / 3
Max. Elementlength (m)   22,90
Boomlength (m)   13,50
Turning Radius (m)   13,25
Feedlines (number)   1 Coax 50 Ohm
Weight (kg)   175
Windload at 130 km/h   3.600 N / 4,5 m² / 48,38 feet²
     
* = average gain over dipol in free-space / for comparison: 2 el monobander 4 dBd, 3 el 5-6 dBd
** = average gain at 20m (80m = 30m) above ground (= dBd + 2.15 dB isotropic + about 5 dB ground reflection)

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Optibeam-OB804030x-big Triband-Yagi 80-40-30m-80multi switch

Optibeam-OB804030x-big Triband-Yagi 80-40-30m-80multi switch

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.