OB12-4 12 Element 4 Band | OptiBeam

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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 ***		3.139,00 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