ANTENNA QY20805XL5D3

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)

8

2385

12.20

42.88

20.58

15.01

45.2

52.2

276.3

-12.22

3.4

 

WORKING CONDITION:

Frequency for SWR=1,5 (MHz)

Z (Ώ)

at 144.100 MHz

SWR at 145.000 MHz

Lowest

Highest

Bandwidth

139.000

146.800

7.800

199.8

1.08:1

 

DIMENSIONS:

 

Ref

De1

De2

D1

D2

D3

DQ1

DQ2

DQ3

All elements made of Al rods Ǿ5 mm

The height of all rectangles is 500

All dimensions given in milimetres

Pos

0

190

325

405

701

1156

1725

2055

2385

Length

1024

1004

916

939

930

910

530

525

510

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)

QY20805XL5D3

1.14

10.05

199.9

1.08:1

3.02

2.20

15.91

3.4

251.2

-5.94

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

KF2YN Boxkite7

1.32

13.34

52.7

1.06:1

4.17

3.40

19.30

5.2

245.5

-2.40

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

13.80

236.2

-9.94

110

13.51

277.7

-10.92

110

13.96

232.3

-9.70

120

13.73

271.3

-10.60

120

14.09

231.6

-9.56

130

13.90

267.7

-10.37

130

14.19

234.7

-9.51

140

14.05

266.0

-10.19

140

14.26

240.5

-9.55

150

14.18

265.8

-10.06

150

14.32

246.4

-9.60

160

14.29

266.6

-9.96

160

14.38

250.3

-9.60

170

14.40

268.2

-9.88

170

14.45

252.5

-9.57

180

14.50

270.3

-9.81

180

14.54

253.4

-9.50

190

14.59

272.6

-9.76

190

14.68

252.8

-9.38

200

14.69

274.7

-9.70

200

14.76

251.5

-9.24

210

14.78

276.5

-9.64

210

14.88

250.5

-9.11

220

14.86

278.2

-9.58

220

14.99

250.6

-9.00

230

14.95

279.4

-9.51

230

15.09

252.4

-8.93

240

15.03

280.2

-9.44

240

15.18

255.7

-8.90

250

15.10

280.6

-9.38

250

15.24

260.3

-8.91

260

15.16

280.7

-9.32

260

15.30

265.5

-8.94

270

15.22

280.7

-9.26

270

15.34

271.1

-8.99

280

15.26

280.4

-9.22

280

15.37

276.6

-9.05

290

15.30

279.9

-9.17

290

 

 

 

300

15.33

279.4

-9.13

300

 

 

 

310

15.36

278.8

-9.09

310

 

 

 

320

15.37

278.1

-9.07

320

 

 

 

330

15.38

277.5

-9.05

330

 

 

 

340

15.39

277.0

-9.03

340

 

 

 

350

15.39

276.5

-9.02

350

 

 

 

360

15.39

276.1

-9.02

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

2.707

2.364

18.12

257.0

-5.98

3.2

Per DL6WU formula

3.020

2.200

18.06

251.1

-5.94

3.2

For max G/T

1.620

1.120

15.83

224.4

-7.68

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

(dB)

F/Sv

(dB)

Hor

(◦)

Ver

(◦)

Temp (◦K)

G/T

(dB)

Tlos

(K)

Horizontal

12.15

42.88

20.58

15.01

45.2

52.2

276.3

-12.27

3.4

Vertical

12.15

33.18

15.82

21.30

52.8

45.6

264.1

-12.01

3.4

 

Horizontal polarisation patterns

 

Vertical polarisation patterns