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4-Element- 12,5-Ohm-Yagi with 3,60m-Boom
Short data: Gain 8,2dBd, F/R >26dB, bandwidth 300KHz (50.0-50.3 MHz) at SWR < 1.5 This type is in use at the station DL8FAJ and was at DL8FBC, both worked WAC in 2000/2001 Picture shows the homemade Yagi by ZP5YW. |
The table for 12-mm and 10-mm-elements (also radiator), no tapering
| Element | Position | Length (12 mm) | Length (10 mm) |
| Ref | 0 mm | 2980 mm | 2986 mm |
| Rad | 750 mm | 2818 mm | 2826 mm |
| D 1 | 2075 mm | 2746 mm | 2756 mm |
| D 2 | 3580 mm | 2686 mm | 2700 mm |
Match with 2xLambda/4 50-Ohm-coax in parallel to a grounded socket, feedpoint impedance 50Ohm.
An other construction for the radiator is a folded dipole with an impedance of 50Ohm (4x12.5Ohm). At the feedpoint use a toroid balun 1:1 (T 200-6) to match the symmetrical load to the coax-cable.
Important: The antenna has extremly high gain and F/B for the given length, but bandwidth is small and the yagi needs a very free surrounding!
