ANTENNA QY20705XL6D2

A wide band 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

2015

11.51

17.75

24.73

20.87

48.8

58.6

288.9

-13.09

3.2

 

WORKING CONDITION:

Frequency for SWR=1,5 (MHz)

Z (Ώ)

at 144.100 MHz

SWR at 145.000 MHz

Lowest

Highest

Bandwidth

139.200

148.000

8.800

201.9

1.01:1

 

DIMENSIONS:

 

Ref

De1

De2

D1

D2

D3

DQ1

DQ2

All elements made of Al rods Ǿ5 mm

Height of all rectangles is 500

All dimensions given in milimetres

Pos

0

195

325

405

695

1035

1485

2015

Length

1020

1010

930

938

932

910

530

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)

QY20705XL6D2

0.97

9.36

201.9

1.01:1

2.82

1.98

15.29

3.2

238.9

-6.37

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

Z(ohms) - measured on 144.100 MHz

Bandwidth – VSWR measured on 145.000 MHz

Data taken from VE7BQH G/T table

 

SWR DIAGRAMS (loss included for Al)

 

SWR DIAGRAMS (losses included)

 

STACKING

Horizontal distance (cm)

G

(dBi)

TA

(K)

G/T

(dB)

Vertical distance (cm)

G

(dBi)

TA

(K)

G/T

(dB)

100

 

 

 

100

13.23

238.4

-10.55

110

12.83

289.1

-11.78

110

13.39

234.3

-10.31

120

13.04

284.9

-11.51

120

13.53

232.9

-10.14

130

13.23

282.3

-11.28

130

13.64

234.5

-10.06

140

13.39

281.0

-11.10

140

13.74

237.3

-10.01

150

13.54

281.0

-10.95

150

13.83

237.7

-9.93

160

13.67

281.9

-10.83

160

13.95

235.1

-9.76

170

13.79

283.4

-10.73

170

14.08

232.3

-9.58

180

13.91

285.3

-10.64

180

14.19

231.6

-9.46

190

14.02

287.3

-10.56

190

14.30

233.4

-9.38

200

14.12

289.2

-10.49

200

14.40

237.4

-9.35

210

14.21

290.9

-10.43

210

14.48

243.4

-9.38

220

14.30

292.2

-10.36

220

14.54

250.9

-9.46

230

14.37

293.1

-10.30

230

14.59

259.7

-9.55

240

14.43

293.8

-10.25

240

 

 

 

250

14.49

294.1

-10.19

250

 

 

 

260

14.53

294.1

-10.16

260

 

 

 

270

14.56

294.0

-10.12

270

 

 

 

280

14.59

293.6

-10.09

280

 

 

 

290

14.61

293.1

-10.06

290

 

 

 

300

14.62

292.5

-10.04

300

 

 

 

310

14.62

291.9

-10.03

310

 

 

 

320

14.63

291.2

-10.01

320

 

 

 

330

14.63

290.5

-10.00

330

 

 

 

340

14.62

289.5

-10.00

340

 

 

 

350

14.62

289.3

-9.99

350

 

 

 

360

14.61

288.8

-10.00

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

252

213

17.44

250.9

-6.55

3.2

Per DL6WU formula

282

198

17.41

238.9

-6.37

3.2

For max G/T

136

122

15.10

223.5

-8.39

3.2

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

11.51

17.76

24.69

20.82

49.0

58.8

288.9

-13.09

3.2

Vertical

11.52

17.18

21.57

25.73

59.2

49.2

269.2

-12.78

3.2

 

Horizontal polarisation patterns

 

Vertical polarisation patterns