BVO2 Yagis by DJ9BV

The latest and best for 144MHz 

from DUBUS Technik V


Introduction

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.

Common Mechanical Data

Electrical Data

Electrical Data at 144.1MHz

Performance

Model,
elements

 

Length Gain [dBd]
dB ref DL6WU

Front/
Rear
ratio [dB]

Beamwidth

Stacking 2x2

 [m]

 [wl]

E [deg]

H [deg]

E [m]

H [m]

Gain [dB]

BVO2-2
8

4.245

2

12.1
+0.4

>23

35.4 38.8 3.36 3.16 5.97

BVO2-3
10

6.264

3

13.4
+0.4

>23

30.8 32.8 3.90 3.70 5.98

BVO2-4
15

8.300

4

14.2
+0.2

>28

28.8 30.4 4.20 4.05 5.94

BVO2-5
18

10.455

5

15.0
+0.3

>29

26.0 27.2 4.58 4.44 5.94
BVO2-6
20
12.480 6

15.65
+0.3

>32

24.8 25.6 4.84 4.68 5.90

More information

Boom-Correction

According to boom diameter, add the following corrections to the free space lengths
(valid only for insulated mount through boom!):

BVO2-3wl (10 El)

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

BVO2-5wl (18 El)

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

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Updated 15 July 2005
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