BVO70 Yagis by DJ9BV

The latest and best for 432MHz

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.

Common Mechanical Data

Electrical Data

Electrical Data at 432.0MHz

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]

BVO70-6
20

4.163

6

15.7
+0.4

>28

24.2

25.2

1.61

1.57

5.90

BVO70-8.5
26

5.85

8.5

17.05
+0.6

>28

20.6

21.2

1.9

1.86

5.95

BVO70-11
32

7.54

11

18.0
+0.7

>28

18.5

18.9

2.12

2.08

5.92

BVO70-13
38

9.22

13

18.85
+0.85

>30

16.8

17.2

2.32

2.28

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!):

BVO70-8.5wl (26 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

334

341

DE

134

324

324

D1

184

312

319

D2

300

306

313

D3

459

297

304

D4

625

294

301

D5

824

291

298

D6

1030

288

295

D7

1247

287

294

D8

1482

286

293

D9

1726

284

291

D10

1972

283

290

D11

2233

282

289

D12

2501

280

287

D13

2776

278

285

D14

3053

277

284

D15

3333

276

283

D16

3613

274

281

D17

3894

273

280

D18

4176

271

278

D19

4453

271

278

D20

4732

274

281

D21

5014

276

283

D22

5298

274

281

D23

5578

272

279

D24

5849

278

285

BVO70-11wl (32 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

338

345

DE

140

328

328

D1

192

313

320

D2

310

305

312

D3

463

296

303

D4

632

295

302

D5

830

291

298

D6

1035

289

296

D7

1254

287

294

D8

1489

286

293

D9

1732

283

290

D10

1980

282

289

D11

2238

282

289

D12

2508

28~

288

D13

2782

279

286

D14

3060

278

285

D15

3339

277

284

D16

3618

276

283

D17

3900

276

283

D18

4182

275

282

D19

4462

273

280

D20

4740

271

278

D21

5018

272

279

D22

5300

272

279

D23

5582

272

279

D24

5862

270

277

D25

6140

270

277

D26

6418

271

278

D27

6700

271

278

D28

6982

271

278

D29

7262

269

276

D30  7540 269 276
Warning: D30 not included  in DUBUS Technik V

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Updated 15 July 2005
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