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

5-Element-10-m-DK7ZB-Yagi with 28 Ohm

A second 5-El.-50-Ohm-Yagi with 7,5 m Boom see down

Boom 9,25 m 

Gain 9,01 dBd = 11,16 dBi

 

 

 

2x5-El.-Yagi stacked, built by 

Tom, DK3EE

 

 Elements of the 5-El.-10-m-28-Ohm-Yagi, lengths for one element-half:   

Instead of 16/12-mm elements it is possible to use 5/8 in and 1/2 in elements (17,1/12,7 mm) without any changes!

 The relation for the tapering gives exactly the same data!

 

16x1,5mm

12x1mm

Position

Ref

1,00 m

1,63 m

0m

Rad

1,00 m

1,56 m

1,790 m

Dir 1

1,00 m

1,475 m

3,605 m

Dir 2

1,00 m

1,46 m

6,640 m
Dir 3 1,00 m 1,39 m 9,250 m

5-Element-10-m-DK7ZB-Yagi with 50 Ohm

Boom 7,50 m   

 

 Match with

 Balun 1:1 or Koax-Choke

Yagi built by DH9FAB

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 5-El.-10m-50Ohm-Yagi, lengths for one element-half:   

Instead of 16/12-mm elements it is possible to use 5/8 in and 1/2 in elements (17,1/12,7 mm) without any changes! The relation for the tapering gives exactly the same data!

 

16x1,5mm

12x1mm

Position

Ref

1,00 m

1,68 m

0m

Rad

1,00 m

1,62 m

1,43 m

Dir 1

1,00 m

1,49 m

2,16 m

Dir 2

1,00 m

1,44 m

4,80 m
Dir 3 1,00 m 1,385 m 7,50 m

  Azimuth-diagram (horizontal pattern):

Elevation-diagram (vertical pattern):

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