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OB12-4 12 Element 4 Band

The OB12-4 is a high effective Yagi for the classical four bands 40, 20, 15 and 10m, four monobanders on one boom.
 
  • The OptiBeam high Q air coil reduces the length of the 40m elements nearly lossfree down to a little bit below convenient 15 meters.
  • Due to the patented OptiBeam „direct coupled driver feed system“ and the especially developed „40m decoupling stubs“ a non compromise feed with a single 50 Ohm coaxial cable is achieved.
OB12-4   12 Element, 4 Band
     
Bands   40 / 20 / 15 / 10
Gain (dBd) *   3,6 / 5,2 / 5,9 / 6,8
Gain (dBi) **   10,5 / 12,5 / 13,5 / 14,5
F/B (dB)   15 / 25 / 20 / 20
VSWR    
40 m allgemeines setting:    
7,00 - 7,05 - 7,15   1,6 - 1,1 - 1,9
40 m USA phone setting:    
7,15 - 7,20 - 7,30   1,6 - 1,1 - 1,9
14,00 - 14,18 - 14,35   1,4 - 1,1 - 1,4
21,00 - 21,25 - 21,45   1,2 - 1,1 - 1,4
28,00 - 28,50 - 29,00   1,5 - 1,1 - 1,4
     
Elements (number)   12
Active Elements   2 / 3 / 3 / 4
Max. Elementlength (m)   14.9
Boomlength (m)   7.6
Turning Radius (m)   8.36
Feedlines (number)   1 Coax 50 Ohm
Weight (kg)   70
Windload at 130 km/h   1.250 N / 1,56 m² / 16,8 feet²
     
Price ***   2.579,00 EUR
* = 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)
*** = outside EU minus 19% tax - subject to change