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

3-Element-12m-Yagi with 12.5Ohm

Boom 3,50m, narrow band version, high F/B

Do not mount this Yagi with other antennas nearby. DK7ZB-match with 2x50-Ohm coax.

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 the12m-12.5Ohm-Yagi, lengths for one element-half: 

 

20x1,5mm

16x1,5mm

12x1mm

Position

Ref

1,00m

1,00m

1,05m

0m

Rad

1,00m

1,00m

0,945m

1,235m

Dir

1,00m

1,00m

0,785m

3,50m

Azimuth-diagram (horizontal pattern):

Elevation-diagram (vertical pattern):

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