Construction Details

3-El.-10m

 4-El-10m

3-El-12m

4-El-12m

3-El.-15m

 4-El.-15m

3-El.-17m

4-El.-17m

3-El.-20m

 4-El.-20m

5-El-10m

4-Element-12-m-Yagi with 28 Ohm

Boom 4,80 m, broadband version

Short data for the Yagi at the begin, in the middle part and at the end of the band

Plot with the NEC-II-reference of YO7.2 by K6STI

The meaning of the data :

Frequency, gain, F/R, radiation resistance (impedance), SWR and loss against a theoretical defined maximum- gain-Yagi with the given boomlength. Remember  that this gain is only available with very low impedance and extrem low bandwidth!

 Elements of the 4-El.-12-m-28-Ohm-Yagi, lengths for one element-half: 

 

20x2mm

16x1,5mm

12x1mm

Position

Ref

1,00m

1,00m

1,07m

0m

Rad

1,00m

1,00m

1,02m

1,20m

Dir 1

1,00m

1,00m

0,90m

2,18m

Dir 2

 1,00m

1,00m

0,71m

4,75m

 

Azimuth-diagram (horizontal pattern):

Elevation-diagram (vertical pattern):

Gain, SWR, F/R and Z versus frequency: