| 4-El-10m | |||
| 4-El.-15m | 3-El.-17m |
||
| 4-El.-20m |
3-Element-17-m-Yagi with 28 Ohm (Version 1)
Boom 5,00 m (Broadband-Yagi for mounting with other antennas nearby)
(A second Yagi with 3,85 m Boom and 12,5 Ohm see down)
|
Dave, M0TAZ, and his team have built the Yagi and tested it on a fieldday. The beam construction really was a team effort and was made possible by Chris G8OCV, George M1GEO, |
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 17-m-28-Ohm-Yagi, lengths for one
element-half:
|
|
30x2mm |
25x2,00mm |
20x1,5mm |
16x1,5mm |
Position |
|
Ref |
0,50m |
1,35m |
1,25m |
1,165m |
0m |
|
Rad |
0,50m |
1,35m |
1,25m |
0,945m |
2,19m |
|
Dir |
0,50m |
1,35m |
1,25m |
0,675m |
4,95m |
Azimuth-diagram (horizontal pattern):
Elevation-diagram (vertical pattern):
3-Element-17-m-Yagi with 12,5 Ohm (Version 2)
 |
Boom 3,85 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 lambda/4 coax. |
 |
 |
Elements of the 17-m-28-Ohm-Yagi, lengths for one
element-half:
|
|
25x2
mm |
20x1,5 mm |
16x1 mm |
12x1 mm |
Position |
|
Ref |
1,00
m |
1,00
m |
1,00
m |
1,305
m |
0
m |
|
Rad |
1,00
m |
1,00
m |
1,00
m |
1,125
m |
1,00
m |
|
Dir |
1,00
m |
1,00
m |
1,00
m |
0,83 m |
3,83 m |
