ANTENNA QY20710XL2D2

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)

7

2665

12.70

21.83

19.92

17.48

43.2

49.6

261.3

-11.48

2.9

 

WORKING CONDITION:

Frequency for SWR=1,5 (MHz)

Z (Ώ)

at 144.100 MHz

SWR at 145.000 MHz

Lowest

Highest

Bandwidth

141.600

146.200

4.600

199.5

1.03:1

 

DIMENSIONS:

 

Ref

De1

De2

D1

D2

D3

DQ1

DQ2

All elements made of Al tubes Ǿ10 mm

The height of rectangles 522 mm

All dimensions given in milimetres

Pos

0

60

290

383

737

1341

2085

2665

Length

1012

1028

798

931

931

895

518

504

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)

G4CQM 6

1.00

9.46

56.7

1.83:1

2.60

2.17

15.44

7.9

249.7

-6.38

KF2YN boxkite6

1.04

12.47

49.9

1.20:1

3.90

3.00

18.25

4.6

263.1

-3.80

Vine 6 FD

1.10

9.69

48.3

1.18:1

2.64

2.21

15.67

8.2

238.4

-5.95

G0KSC 6LFA

1.13

9.69

49.3

1.04:1

2.60

2.19

15.64

4.0

236.9

-5.96

DD0VF 6

1.16

9.73

27.2

1.07:1

2.63

2.22

15.71

5.5

240.1

-5.94

M2 2M7

1.28

9.94

204.9

1.14:1

2.65

2.26

15.76

3.7

245.0

-5.98

QY20710XL2D2

1.28

10.56

199.5

1.03:1

3.26

2.30

16.44

2.9

239.5

-5.21

G0KSC 7LFA

1.39

10.62

48.0

1.19:1

2.84

2.49

16.53

1.8

248.9

-5.28

Z(ohms) - measured on 144.100 MHz

Bandwidth – VSWR measured on 145.000 MHz

Data taken from VE7BQH G/T table

 

SWR 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

14.22

233.7

-9.45

110

13.81

270.7

-10.51

110

14.38

222.7

-9.18

120

14.09

262.6

-10.10

120

14.52

225.3

-8.99

130

14.28

258.2

-9.83

130

14.62

226.9

-8.92

140

14.44

255.6

-9.63

140

14.70

231.3

-8.93

150

14.57

254.3

-9.48

150

14.78

235.2

-8.92

160

14.69

254.0

-9.35

160

14.87

236.7

-8.86

170

14.81

254.5

-9.24

170

14.97

236.8

-8.76

180

14.91

255.6

-9.16

180

15.07

236.6

-8.66

190

15.01

257.1

-9.08

190

15.17

236.0

-8.55

200

15.10

258.8

-9.02

200

15.28

235.2

-8.42

210

15.19

260.4

-8.96

210

15.39

234.7

-8.30

220

15.28

261.9

-8.90

220

15.49

235.2

-8.21

230

15.37

263.2

-8.83

230

15.58

237.0

-8.16

240

15.45

264.2

-8.76

240

15.67

240.3

-8.13

250

15.52

264.9

-8.71

250

15.73

244.7

-8.15

260

15.59

265.3

-8.64

260

15.79

249.8

-8.18

270

15.65

265.5

-8.59

270

 

 

 

280

14.70

265.5

-8.54

280

 

 

 

290

14.74

265.3

-8.49

290

 

 

 

300

14.78

264.9

-8.45

300

 

 

 

310

14.81

264.5

-8.41

310

 

 

 

320

14.83

263.9

-8.38

320

 

 

 

330

14.85

263.4

-8.35

330

 

 

 

340

14.86

262.8

-8.33

340

 

 

 

350

15.87

262.3

-8.31

350

 

 

 

360

15.88

261.8

-8.29

360

 

 

 

370

15.88

261.3

-8.29

 

 

 

 

380

15.87

261.0

-8.29

 

 

 

 

*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)

Remark

2726

2480

18.62

248.6

-5.34

Per DL6WU formula

3260

2300

18.59

239.5

-5.21

For max G/T

3260

1260

17.63

225.4

-5.99

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

12.70

21.83

19.92

17.48

43.2

49.6

261.3

-11.48

2.9

Vertical

12.76

19.87

16.73

19.82

48.8

42.8

254.5

-11.30

2.9

 

Horizontal polarisation patterns

 

Vertical polarisation patterns