Construction Details

2-El.-12,5-Ohm (0,35m)   

2-El.-28-Ohm (0,60m)

3-El.-12,5-Ohm (1,90m)

3-El.-28-Ohm (1,90m)

3-El.-28-Ohm (2,50m)

4-El-12,5-Ohm (2,90m)

4-El-12,5-Ohm (3,60m)

5-El.-28-Ohm (4,50m)

5-El-12,5-Ohm (6,00m)

5-El-18-Ohm (6,00m)

6-El.-28-Ohm (7,20m)

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 2,90m-Boom

Short data: Gain 7,5dBd, F/B >20dBdB, bandwidth 300KHz (50.0-50.3 MHz) at SWR < 1.5

Elements 12mm

Element

Element-position (mm)

Element-length (mm)

R

0

3080

DE

575

2870

D1

1455

2790

D2 2850 2700

Match with 2xLambda/4 50-Ohm-coax in parallel to a grounded socket, feedpoint impedance 50Ohm.