| 4-El-10m | 3-El-12m |
||
| 4-El.-15m | |||
| 4-El.-20m |
3-Element-12-m-Yagi with 12.5 Ohm (Version 1)
Boom 3,50 m, narrow band version, high gain, high F/B (Version 2 see down)
Do not mount this Yagis with other antennas nearby. DK7ZB-match with 2x50-Ohm lambda/4 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 the 12-m-12.5-Ohm-Yagi, lengths for one
element-half:
|
|
20x1,5 mm |
16x1,5 mm |
12x1
mm |
Position |
|
Ref |
1,00
m |
1,00
m |
1,05
m |
0 m |
|
Rad |
1,00
m |
1,00
m |
0,945
m |
1,235 m |
|
Dir |
1,00
m |
1,00
m |
0,785
m |
3,50 m |
Azimuth-diagram (horizontal pattern):
Elevation-diagram (vertical pattern):
Gain, SWR, F/R and Z versus frequency:
3-Element-12-m-Yagi with 12.5 Ohm (Version 2)
Boom 2,85 m, narrow band version, extreme high F/B
 |
Gain 5,4 dBd F/B > 30 dB 3-dB-angle hor. 64,6° 3-dB-angle ver. 107,8° Do not mount this Yagis with other antennas nearby. DK7ZB-match with 2x50-Ohm coax. |
 |
|
Elements of the 12-m-12.5-Ohm-Yagi, lengths for one
element-half:
|
|
20x1,5mm |
16x1,5mm |
12x1mm |
Position |
|
Ref |
1,00
m |
1,00
m |
1,10
m |
0 m |
|
Rad |
1,00
m |
1,00
m |
0,965
m |
0,725 m |
|
Dir |
1,00
m |
1,00
m |
0,74 m |
2,82 m, |
Needed lengths of the Aluminium tubes (remember: the middle and outer pieces need an additional part for overlap!)
|
|
20x1,5
mm |
16x1,5
mm |
12x1 mm |
|
Reflector |
1x 2,00 m | 2x 1,20 | 2x 1,30 m |
|
Radiator |
2x 0,99 m |
2x 1,20 m |
2x 1,20 m |
|
Director |
1x
2,00 m |
2x
1,20 m |
2x 1,05 m |
