ANTENNA QY20708XL6D2

An antenna for small and moderate stacking distances

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

2065

11.81

22.45

20.86

18.59

46.8

55.0

285.7

-12.75

2.6

 

WORKING CONDITION:

Frequency for SWR=1,5 (MHz)

Z (Ώ)

at 144.100 MHz

SWR at 145.000 MHz

Lowest

Highest

Bandwidth

139.000

146.500

6.500

199.8

1.08:1

 

DIMENSIONS:

 

Ref

De1

De2

D1

D2

D3

DQ1

DQ2

All elements made of Al rods Ǿ8 mm

The height of all rectangles is 500

All dimensions given in milimetres

Pos

0

160

320

419

705

1064

1585

2065

Length

1024

1024

850

932

933

904

542

522

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)

QY20708XL6D2

0.99

9.66

199.8

1.07:1

3.02

2.06

15.60

2.6

243.7

-6.12

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

*DD0VF 6

1.16

9.73

27.2

1.07:1

2.30

2.30

15.58

5.5

245.1

-6.16

M2 2M7

1.28

9.94

204.9

1.14:1

2.65

2.26

15.76

3.7

245.0

-5.98

*M2 2M7

1.28

9.94

204.9

1.14:1

2.21

2.03

15.17

3.7

239.9

-6.48

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

13.42

241.4

-10.40

110

12.95

293.9

-11.73

110

13.59

237.4

-10.15

120

13.24

284.9

-11.31

120

13.75

235.8

-9.96

130

13.46

279.9

-11.01

130

13.89

236.3

-9.83

140

13.64

277.2

-10.79

140

14.02

237.3

-9.72

150

13.80

276.2

-10.61

150

14.15

237.0

-9.59

160

13.94

276.4

-10.47

160

14.27

236.1

-9.45

170

14.07

277.4

-10.36

170

14.38

236.1

-9.34

180

14.19

279.0

-10.26

180

14.49

237.3

-9.25

190

14.30

280.9

-10.18

190

14.59

239.2

-9.19

200

14.40

282.9

-10.11

200

14.68

242.0

-9.15

210

14.50

284.7

-10.04

210

14.76

246.0

-9.14

220

14.58

286.4

-9.99

220

14.83

251.5

-9.17

230

14.66

287.7

-9.93

230

14.88

258.1

-9.23

240

14.73

288.7

-9.87

240

 

 

 

250

14.78

289.5

-9.84

250

 

 

 

260

14.83

289.8

-9.79

260

 

 

 

270

14.87

290.0

-9.75

270

 

 

 

280

14.90

289.8

-9.72

280

 

 

 

290

14.93

289.5

-9.69

290

 

 

 

300

14.94

289.1

-9.67

300

 

 

 

310

14.96

288.5

-9.64

310

 

 

 

320

14.96

287.9

-9.63

320

 

 

 

330

14.97

287.3

-9.61

330

 

 

 

340

14.97

286.7

-9.60

340

 

 

 

350

14.97

286.2

-9.60

350

 

 

 

360

14.96

285.7

-9.60

360

 

 

 

*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

2619

2254

17.78

257.2

-6.32

2.6

Per DL6WU formula

3020

2060

17.75

243.7

-6.12

2.6

For max G/T

3120

1690

17.41

231.9

-6.24

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

11.81

22.45

20.86

18.59

46.8

55.0

285.7

-12.75

2.6

Vertical

11.72

19.91

18.10

22.65

56.2

47.6

274.2

-12.66

2.3

 

Horizontal polarisation patterns

 

 

Vertical polarisation patterns