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-10-m-Yagi with 28 Ohm

Boom 3,80 m

The 10-m- 4-Element-28-Ohm-Yagi,

 

built by Mich, 

ON8DM

The 10-m- 4-Element-28-Ohm-Yagi,

 

built by Fabricio, 

PU1KVA

 

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 Yagi built by Tim, K7XC

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.-10-m-28-Ohm-Yagi, lengths for one element-half: 

 

16x1,5mm

12x1mm

Position

Ref

0,50m

2,17m

0m

Rad

0,50m

2,095m

0,90m

Dir 1

0,50m

2,00m

1,70m

Dir 2

0,50m

1,84m

3,80m

 

Azimuth-diagram (horizontal pattern):

Elevation-diagram (vertical pattern):

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