ANTENNA QY20808XL7D3

PERFORMANCES:

No of ele

L (mm)

G (dBi)

F/B (dB)

F/Sh (dBi)

F/Sv (dBi)

Hor (◦)

Ver (◦)

Temp (◦K)

G/T (dB)

Tlos

(K)

8

2945

12.83

24.20

21.32

15.95

43.2

48.4

257.9

-11.28

2.6

 

WORKING CONDITION:

Frequency for SWR=1,5 (MHz)

Z (Ώ)

at 144.100 MHz

SWR at 145.000 MHz

Lowest

Highest

Bandwidth

139.700

146.500

6.800

200.0

1.08:1

 

DIMENSIONS:

 

Ref

De1

De2

D1

D2

D3

DQ1

DQ2

DQ3

All elements made of Al rods Ǿ8 mm

The height of all rectangles is 500

All dimensions given in milimetres

Pos

0

160

320

424

745

1102

1612

2316

2945

Length

1018

1028

830

934

914

887

538

518

502

No boom correction included.

 

COMPARISON

TYPE OF

ANTENNA

SINGLE ANTENA

FOUR ANTENNAS IN H-STACK

L

(λ)   

GAIN

(dBd)

Z

(ohms)

VSWR

Bandwidth

E

(m)

H

(m)

Ga

(dBd)

Tlos

(K)

Ta

(K)

G/T

(dB)

G0KSC 7LFA

1.39

10.62

48.0

1.19:1

2.84

2.49

16.53

1.8

248.9

-5.28

QY20808XL7D3

1.41

10.68

200.0

1.08:1

3.26

2.50

16.63

2.6

245.8

-5.12

DG7YBN 7

1.44

10.59

47.2

1.70:1

2.88

2.47

16.55

4.5

242.7

-5.15

Vine 7 FD

1.45

10.56

47.9

1.14:1

2.83

2.46

16.47

8.2

238.6

-5.16

G4CQM 7

1.50

10.76

50.7

2.31:1

2.89

2.53

16.69

7.9

239.9

-4.96

CT1FFU 7

1.54

10.82

28.0

1.02:1

2.87

2.50

16.70

2.8

237.7

-4.96

DK7ZB 7

1.57

11.11

28.4

1.64:1

3.16

2.84

17.13

5.8

272.6

-5.07

IK0BZY 6

1.63

11.11

19.5

2.27:1

3.10

2.77

17.04

4.8

266.5

-5.07

Z(ohms) - measured on 144.100 MHz

Bandwidth – VSWR measured on 145.000 MHz

Data taken from VE7BQH G/T table

 

DIAGRAMS (no loss included)

 

SWR DIAGRAMS (loss included for Al)

 

STACKING

Horizontal distance (cm)

G

(dBi)

TA

(K)

G/T

(dB)

Vertical distance (cm)

G

(dBi)

TA

(K)

G/T

(dB)

100

 

 

 

100

14.35

230.3

-9.26

110

14.12

260.3

-10.03

110

14.50

226.0

-9.03

120

14.32

253.7

-9.72

120

14.63

224.4

-8.87

130

14.47

250.5

-9.51

130

14.73

226.0

-8.80

140

14.60

248.9

-9.35

140

14.81

229.9

-8.79

150

14.72

248.5

-9.23

150

14.88

233.7

-8.80

160

14.83

249.1

-9.13

160

14.95

236.1

-8.77

170

14.93

250.4

-9.05

170

15.03

237.7

-8.72

180

15.03

252.2

-8.98

180

15.11

239.1

-8.67

190

15.12

254.1

-8.92

190

15.20

239.9

-8.59

200

15.21

256.2

-9.87

200

15.30

239.8

-8.49

210

15.30

258.1

-8.81

210

15.40

239.2

-8.38

220

15.38

259.7

-8.76

220

15.51

238.7

-8.26

230

15.47

261.0

-8.69

230

15.61

239.0

-8.17

240

15.55

261.9

-8.63

240

15.70

240.6

-8.10

250

15.62

262.5

-8.57

250

15.78

243.1

-8.07

260

15.69

262.7

-8.50

260

15.85

246.6

-8.06

270

15.76

262.7

-8.43

270

15.91

250.7

-8.07

280

15.81

262.4

-8.38

280

15.96

255.1

-8.10

290

15.86

262.0

-8.32

290

 

 

 

300

15.90

261.4

-8.27

300

 

 

 

310

15.93

260.8

-8.23

310

 

 

 

320

15.95

260.1

-8.20

320

 

 

 

330

19.57

259.4

-8.16

330

 

 

 

340

15.98

258.7

-8.14

340

 

 

 

350

15.99

258.1

-8.12

350

 

 

 

360

16.00

257.6

-8.10

360

 

 

 

370

16.00

257.2

-8.10

 

 

 

 

380

16.00

256.9

-8.09

 

 

 

 

390

15.99

256.7

-8.10

 

 

 

 

400

15.98

256.6

-8.11

 

 

 

 

*The Table is presented without KF2YN convergence correction applied and serves only to show which distance can be used with good

result. and which distances should be avoided. In H-stack it can be slightly changed.

 

BEST DISTANCES FOR 4 ANTENNAS IN H-STACK

Horizontal

distance (cm)

Vertical distance (cm)

G

(dBi)

TA

(K)

G/T

(dB)

Tloss

(K)

Remark

2826

2538

18.71

249.4

-5.25

2.6

Per DL6WU formula

3260

2500

18.78

245.8

-5.12

2.6

For max G/T

3460

1240

17.68

222.8

-5.80

2.6

For lowest temperature

 

 

XPOL VERSION

Horizontal components: Same as above

Vertical components: Same as above, except:

PERFORMANCES:

Polarization

G (dBi)

F/B (dB)

F/Sh (dBi)

F/Sv (dBi)

Hor (◦)

Ver (◦)

Temp (◦K)

G/T (dB)

Tlos

(K)

Horizontal

12.83

24.20

21.32

15.95

43.2

48.4

257.9

-11.28

2.6

Vertical

11.73

21.27

15.65

22.61

49.2

43.8

249.8

-11.25

2.3

 

Horizontal polarisation patterns

 

 

Vertical polarisation patterns