| 4-El-12,5-Ohm (2,90m) |
4-El-12,5-Ohm (3,60m) |
|
| 5-El-12,5-Ohm (6,00m) | ||
| 7-El.-28-Ohm (9,20mm) | 8-El.-28-Ohm (12,30m) | 9-El.-28-Ohm (14,00m) |
| new 4-El-28-Ohm (2,20m) |
|
|
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. |
|
Element |
Element-position (mm) |
Element-length (mm) |
|
R |
0 |
2980 |
|
DE |
750 |
2840 |
|
D1 |
2075 |
2756 |
| D2 | 3580 | 2686 |
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!
