ANTENNA X21008XL3Q

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)

10

1645

12.57

23.17

-

15.82

48.2

42.5

250.6

-11.42

3.0

 

WORKING CONDITION:

Frequency for SWR=1.5 (MHz)

Z (Ώ)

at 144.100 MHz

SWR at 145.000 MHz

Lowest

Highest

Bandwidth

141.300

146.300

5.000

201.9

1.08:1

 

DIMENSIONS:

 

Ref

De

D1

D2

D3

D4

Dimensions given in milimetres

Diameter of elements 8 milimetres

No boom correction included.

 

Pos

0

225

389

762

1226

1645

Length

1012

800

916

915

937

913

Height

0

220

230

395

535

575

 

CONSTRUCTION OF RADIATOR

H =800

V = 220

= 8 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)

X21008XL3Q

0.79

10.27

201.9

1.08:1

3.70

3.00

16.45

3.0

247.0

-5.32

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

 

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

13.88

232.4

-9.81

110

 

 

 

120

14.09

232.5

-9.61

120

 

 

 

130

14.26

233.6

-9.46

130

 

 

 

140

14.41

235.2

-9.34

140

 

 

 

150

14.54

237.5

-9.25

150

 

 

 

160

14.66

240.4

-9.18

160

 

 

 

170

14.77

243.7

-9.12

170

 

 

 

180

14.86

247.2

-9.09

180

 

 

 

190

14.95

250.8

-9.06

190

 

 

 

200

15.02

254.0

-9.05

200

14.89

246.4

-9.05

210

15.09

256.9

-9.02

210

14.97

246.4

-8.97

220

15.16

259.0

-8.99

220

15.02

247.2

-8.93

230

15.22

260.5

-8.95

230

15.05

248.4

-8.92

240

15.27

261.3

-8.92

240

15.07

249.4

-8.92

250

15.32

261.5

-8.87

250

15.10

249.3

-8.89

260

15.36

261.1

-8.82

260

15.17

247.4

-8.79

270

15.40

260.2

-8.77

270

15.27

244.9

-8.64

280

15.43

259.0

-8.72

280

15.37

243.5

-8.52

290

15.46

257.5

-8.66

290

15.45

244.3

-8.46

300

15.48

255.9

-8.62

300

15.51

247.0

-8.44

310

15.50

254.2

-8.57

310

15.55

250.8

-8.47

320

15.52

252.4

-8.52

320

 

 

 

330

15.53

250.8

-8.49

330

 

 

 

340

15.54

249.4

-8.45

340

 

 

 

350

15.55

248.2

-8.42

350

 

 

 

360

15.55

247.2

-8.40

360

 

 

 

370

15.55

246.7

-8.39

 

 

 

 

*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

2548

2870

18.41

254.3

-5.65

3.0

Per DL6WU formula

3700

3000

18.60

247.0

-5.32

3.0

For max G/T

1180

2800

17.01

234.0

-6.68

3.0

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

3000

21.66

245.4

-2.24

3.0

 

 

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

Horizontal

distance (mm)

Vertical distance (mm)

G

(dBi)

TA

(K)

G/T

(dB)

Tlos

(K)

3500

2900

21.64

239.8

-2.16

3.0

 

 

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)

3500

2900

24.67

238.1

+0.90

3.0