Construction Details

2-El.-12,5-Ohm (0,40 m)   

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

3-El.-12,5-Ohm (1,90+2,20 m) new

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

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

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

4-El-12,5-Ohm (3,60 + 4,00 m)

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

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

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

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

7-El.-28+50Ohm (9,20+7,75 m) 8-El.-28-Ohm (12,30 m) 9-El.-28-Ohm (14,00 m)
4-El-28+50-Ohm (2,20 m) 5-El-50-Ohm (4,30 m) new 6-El-50-Ohm (6m+7,20 m) new

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

Short data: Gain 11.91 dBd, F/B >24dB, bandwidth >1MHz (!) at SWR < 1.5

Good pattern, great bandwidth and high gain! 

 

The Yagi built by Steve,

HA0DU

Element

Element-position (mm)

Element-length (12mm)

Ref

0

2930

Rad

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: