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)  

8-Element-28-Ohm-Yagi with 12.3m-Boom

Short data: Gain 11.9 dBd, F/B >24dB, bandwidth >1MHz (!) at SWR < 1.5

Good pattern, great bandwidth and high gain! 

Element

Element-position (mm)

Element-length (mm)

R

0

2930

DE

1155

2870

D1

1935

2780

D2

3505

2690

D3

5530

2640

D4 7900 2620
D5 10270 2610
D6 12260 2600

Match with 2xLambda/4 75-Ohm-coax in parallel to a grounded socket, feedpoint impedance 50Ohm.

 

The element current profile on the main menue of YO7 from K6STI: