ANTENNA X21205XL4Q

 

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)

12

2305

13.44

34.34

-

16.14

44.5

38.1

235.8

-10.29

4.5

 

WORKING CONDITION:

Frequency for SWR=1.5 (MHz)

Z (Ώ)

at 144.100 MHz

SWR at 145.000 MHz

Lowest

Highest

Bandwidth

141.800

146.800

5.000

199.2

1.14:1

 

DIMENSIONS:

 

Ref

De

D1

D2

D3

D4

D5

Dimensions given in milimetres

Diameter of elements 5 milimetres

No boom correction included.

 

Pos

0

238

402

754

1194

1742

2305

Length

1016

776

919

927

937

927

901

Height

0

240

230

390

520

595

635

 

CONSTRUCTION OF RADIATOR

H = 776

V = 240

= 5 mm

 

 

 

COMPARISON (inserted in a part of VE7BQH table, where it belongs according to its boom length)

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

X21205XL4Q

1.11

11.29

199.2

1.14:1

3.70

3.42

17.39

4.5

238.2

-4.23

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

 

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

 

 

 

110

14.60

225.2

-8.97

110

 

 

 

120

14.81

222.3

-8.71

120

 

 

 

130

14.97

221.9

-8.54

130

 

 

 

140

15.11

222.7

-8.41

140

 

 

 

150

15.23

224.2

-8.32

150

 

 

 

160

15.34

226.3

-8.25

160

 

 

 

170

15.44

229.0

-9.20

170

 

 

 

180

15.54

231.9

-8.15

180

15.04

273.2

-9.34

190

15.62

234.8

-8.12

190

15.26

261.9

-8.94

200

15.71

237.6

-8.08

200

15.43

253.8

-8.65

210

15.79

240.0

-8.04

210

15.56

248.3

-8.43

220

15.86

241.9

-8.01

220

15.66

244.5

-8.26

230

15.94

243.2

-7.95

230

15.73

241.8

-8.15

240

16.01

243.9

-7.09

240

15.78

240.1

-8.07

250

16.08

244.1

-7.83

250

15.82

240.9

-8.04

260

16.14

243.9

-7.76

260

15.86

243.6

-8.05

270

16.19

243.2

-7.70

270

15.90

245.1

-8.03

280

16.24

242.4

-7.64

280

15.96

244.2

-7.96

290

16.27

241.3

-7.59

290

16.02

241.9

-7.86

300

16.31

240.0

-7.53

300

16.09

239.3

-7.75

310

16.33

238.7

-7.48

310

16.16

237.3

-7.64

320

16.36

237.4

-7.43

320

16.23

236.2

-7.55

330

16.37

236.2

-7.40

330

16.28

236.2

-7.50

340

16.39

235.0

-7.36

340

16.33

237.1

-7.47

350

16.40

233.9

-7.33

350

16.35

238.6

-7.47

360

16.40

233.1

-7.31

360

16.37

240.4

-7.48

370

16.41

232.5

-7.29

370

16.38

242.1

-7.50

380

16.41

232.4

-7.29

380

16.38

243.6

-7,53

*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.

*Yellow coloured good distances

 

 

BEST DISTANCES FOR STACK

 

Four antennas in H-stack

Horizontal

distance (mm)

Vertical distance (mm)

G

(dBi)

TA

(K)

G/T

(dB)

Tlos

(K)

Remark

2747

3187

19.27

246.0

-4.64

4.5

Per DL6WU formula

3700

3420

19.54

238.2

-4.23

4.5

For max G/T

1340

3300

18.12

221.1

-5.33

4.8

For lowest temperature

 

Eight antennas in stack (four in horizontal and two in vertical plane)

Horizontal

distance (mm)

Vertical distance (mm)

G

(dBi)

TA

(K)

G/T

(dB)

Tlos

(K)

3700

3420

22.57

236.0

-1.16

4.8

1340

3380

20.53

221.3

-2.92

4.8

 

 

Sixteen antennas (four in horizontal and four antennas in vertical plane)

Horizontal

distance (mm)

Vertical distance (mm)

G

(dBi)

TA

(K)

G/T

(dB)

Tlos

(K)

1340

3380

23.55

217.7

+0.17

4.8

3700

3420

25.58

238.5

+1.80

4.8