ANTENNA QY21408XL5D7

 

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)

14

8625

16.40

32.07

21.48

18.22

29.8

31.0

218.5

-6.99

5.7

 

WORKING CONDITION:

Frequency for SWR=1,5 (MHz)

Z (Ώ)

at 144.100 MHz

SWR at 145.000 MHz

Lowest

Highest

Bandwidth

141.500

145.800

4.300

199.9

1.02:1

 

DIMENSIONS:

 

Ref

De1

De2

D1

D2

D3

DQ1

DQ2

All elements made of Al rods Ǿ8mm

The height of all rectangles is 500

All dimensions given in milimetres

Pos

0

200

350

426

732

1292

1963

2734

Length

1016

1016

860

942

950

928

908

891

 

 

DQ3

DQ4

DQ5

DQ6

DQ7

 

 

Pos

3558

4374

5294

6132

7056

7924

8625

 

Length

522

504

492

482

476

468

458

 

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)

QY21408XL5D7

4.14

14.25

199.9

1.02:1

4.26

4.36

20.26

5.7

217.1

-0.95

CC4218XL

4.19

14.28

14.8

1.43:1

4.33

4.13

20.22

8.7

245.0

-1.52

WB9UWA 15

4.18

13.65

26.0

1.51:1

3.75

3.50

19.44

8.3

208.9

-1.61

G0KSC 14LFA3R

4.23

14.44

48.8

1.07:1

4.19

4.00

20.35

2.4

216.5

-0.86

YU7EF 14M

4.24

14.23

48.6

1.07:1

4.07

3.85

20.08

7.0

220.1

-1.20

UA9TC 14RS

4.24

14.33

49.5

1.06:1

4.13

3.80

20.22

5.2

216.7

-0.99

G0KSC 14 LFA

4.30

14.51

47.1

1.22:1

4.24

4.02

20.41

5.5

218.1

-0.82

KF2YN Boxkite 16

4.30

15.85

50.5

1.16:1

5.50

5.10

21.83

6.2

227.4

0.41

InnoV 14 LFA

4.32

14.45

48.6

1.10:1

4.18

3.97

20.34

6.6

215.6

-0.85

YU7EF 14

4.37

14.48

41.0

2.30:1

4.21

4.00

20.33

8.8

220.0

-0.94

YU7EF 14LT

4.37

13.91

47.8

1.29:1

3.89

3.64

19.60

11.7

211.0

-1.49

K1FO 17

4.40

14.44

27.7

1.25:1

4.24

4.02

20.34

4.9

229.5

-1.12

DJ9BV 4.4

4.41

14.32

38.3

1.36:1

4.27

4.07

20.18

6.6

251.5

-1.68

SHARK 20

4.47

14.34

42.8

1.05:1

4.33

4.10

20.19

3.9

258.5

-1.79

I0JXX 16

4.47

14.36

30.4

1.05:1

4.05

4.05

20.24

8.4

217.5

-0.98

CC17B2

4.49

14.53

200.1

1.20:1

4.27

4.07

20.43

5.9

228.6

-1.01

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 (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

16.90

223.4

-6.60

110

16.41

251.8

-7.57

110

17.17

218.5

-6.23

120

16.87

238.7

-6.89

120

17.37

216.1

-5.98

130

17.22

233.1

-6.43

130

17.52

215.8

-5.82

140

17.47

229.1

-6.11

140

17.65

216.3

-5.70

150

17.66

226.3

-5.86

150

17.76

216.2

-5.59

160

17.81

224.5

-5.68

160

17.87

215.2

-5.46

170

17.93

223.2

-5.53

170

17.97

214.6

-5.35

180

18.05

222.3

-5.39

180

18.07

214.6

-5.24

190

18.14

221.8

-5.29

190

18.16

214.9

-5.16

200

18.24

221.3

-5.18

200

18.24

215.4

-5.09

210

18.32

221.0

-5.10

210

18.32

216.0

-5.02

220

18.40

220.7

-5.01

220

18.40

216.8

-4.96

230

18.48

220.3

-4.92

230

18.47

217.7

-4.91

240

18.55

219.9

-4.84

240

18.54

218.6

-4.85

250

18.63

219.3

-4.75

250

18.61

219.3

-4.80

260

18.70

218.7

-4.67

260

18.67

219.8

-4.75

270

18.77

218.1

-4.59

270

18.74

219.9

-4.68

280

18.84

217.4

-4.50

280

18.81

219.5

-4.60

290

18.91

216.7

-4.42

290

18.88

218.9

-4.52

300

18.98

216.0

-4.33

300

18.95

218.0

-4.43

310

19.04

215.4

-4.26

310

19.01

217.1

-4.36

320

19.11

214.9

-4.18

320

19.08

216.3

-4.27

330

19.17

214.5

-4.11

330

19.14

215.7

-4.20

340

19.23

214.3

-4.05

340

19.20

215.4

-4.13

350

19.28

214.1

-3.99

350

19.25

215.4

-4.08

360

19.33

214.1

-3.94

360

19.30

215.6

-4.03

370

19.38

214.1

-3.89

370

19.34

215.9

-4.00

380

19.42

214.2

-3.86

380

19.38

216.1

-3.96

390

19.45

214.4

-3.83

390

19.41

216.3

-3.94

400

19.48

214.7

-3.81

400

19.44

216.4

-3.91

410

19.51

215.0

-3.78

410

19.47

216.6

-3.88

420

19.53

215.3

-3.77

420

19.49

216.6

-3.87

430

19.55

215.5

-3.75

430

19.51

216.7

-3.85

440

19.57

215.8

-3.74

440

19.52

216.6

-3.84

450

19.59

216.0

-3.72

450

19.54

216.5

-3.81

460

19.60

216.2

-3.72

460

19.55

216.3

-3.80

470

19.61

216.4

-3.71

470

19.56

216.0

-3.78

480

19.62

216.5

-3.70

480

19.57

215.6

-3.77

490

19.63

215.6

-3.70

490

19.57

215.2

   -3.76

500

19.63

215.7

-3.70

500

19.58

214.9

-3.74

510

19.63

215.7

-3.70

510

19.58

214.5

-3.73

*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

4045

3892

22.27

215.6

-1.06

5.7

Per DL6WU formula

4260

4360

22.41

217.1

-0.95

5.7

For max G/T

3860

4360

22.32

215.5

-1.01

5.7

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

16.40

32.07

21.48

18.22

29.8

31.0

218.5

-6.99

5.7

Vertical

16.46

32.43

17.28

20.66

30.4

29.4

222.1

-7.01

5.9

 

Horizontal polarisation patterns

 

 

Vertical polarisation patterns