from DUBUS Technik V
The Yagis were developed by means of NEC optimization and evaluation. All models have been constructed and tested successfully. They feature higher gain (see table) and better pattern than former designs, which have been published in DUBUS Technik III.
Because of their near 50 ohm input impedance, they all can be successfully driven by an appropriate folded dipole. Experiments can be performed by constructing a T-type dipole with 4:1 balun. This could be the starting point for the final folded dipole.
For practical construction details, see the VHF/UHF Long Yagi Workshop page, and also DF8GH's BVO page.
Electrical Data at 144.1MHz
Model, elements
|
Length |
Gain [dBd] dB ref DL6WU |
Front/ |
Beamwidth |
Stacking 2x2 | ||||
[m] |
[wl] |
E [deg] |
H [deg] |
E [m] |
H [m] |
Gain [dB] |
|||
BVO2-2 |
4.245 |
2 |
12.1 |
>23 |
35.4 | 38.8 | 3.36 | 3.16 | 5.97 |
BVO2-3 |
6.264 |
3 |
13.4 |
>23 |
30.8 | 32.8 | 3.90 | 3.70 | 5.98 |
BVO2-4 |
8.300 |
4 |
14.2 |
>28 |
28.8 | 30.4 | 4.20 | 4.05 | 5.94 |
BVO2-5 |
10.455 |
5 |
15.0 |
>29 |
26.0 | 27.2 | 4.58 | 4.44 | 5.94 |
BVO2-6 20 |
12.480 | 6 |
15.65 |
>32 |
24.8 | 25.6 | 4.84 | 4.68 | 5.90 |
According to boom diameter, add the following corrections to the free space lengths
(valid only for insulated mount through boom!):
No commercial use is permitted without written permission from DUBUS Verlag.
Element |
Position [mm] |
Free Space Length [mm] |
Length [mm] for 25 mm Boom |
R |
0 |
1010 | 1013 |
DE |
391 | 968 | 968 |
D1 |
669 | 954 | 957 |
D2 |
1244 | 932 | 935 |
D3 |
2000 | 915 | 918 |
D4 |
2847 | 904 | 907 |
D5 |
3734 | 898 | 901 |
D6 |
4625 | 894 | 897 |
D7 |
5503 | 890 | 893 |
D8 |
6264 | 906 | 909 |
No commercial use is permitted without written permission from DUBUS Verlag.
Element |
Position [mm] |
Free Space Length [mm] |
Length [mm] for 30 mm Boom |
R |
0 | 1018 | 1023 |
DE |
385 | 980 | 980 |
D1 |
535 | 957 | 962 |
D2 |
905 | 942 | 947 |
D3 |
1365 | 916 | 927 |
D4 |
1847 | 914 | 919 |
D5 |
2480 | 911 | 916 |
D6 |
3130 | 895 | 900 |
D7 |
3770 | 890 | 895 |
D8 |
4450 | 890 | 895 |
D9 |
5190 | 893 | 898 |
D10 |
5957 | 884 | 889 |
D11 |
6770 | 880 | 885 |
D12 |
7585 | 880 | 885 |
D13 |
8343 | 877 | 882 |
D14 |
9072 | 886 | 891 |
D15 |
9800 | 878 | 883 |
D16 |
10455 | 868 | 873 |
Back to | ||
VHF/UHF Long Yagi Workshop |
Updated 15 July 2005
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