ANTENNA X21210XL4Q

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

13.54

26.94

--

17.33

44.6

37.0

230.8

-10.09

2.7

 

WORKING CONDITION:

Frequency for SWR=1.5 (MHz)

Z (Ώ)

at 144.100 MHz

SWR at 145.000 MHz

Lowest

Highest

Bandwidth

141.400

146.600

5.200

201.5

1.10:1

 

DIMENSIONS:

 

Ref

De

D1

D2

D3

D4

D5

Dimensions given in milimetres

Diameter of elements 10 milimetres

No boom correction included.

 

Pos

0

240

402

758

1194

1750

2305

Length

1010

792

919

921

924

907

889

Height

0

240

230

390

530

600

645

 

CONSTRUCTION OF RADIATOR

H = 792

V = 240

= 10 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

X21210XL4Q

1.11

11.32

201.5

1.10:1

3.80

3.48

17.49

3.3

233.3

-4.04

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

 

 

 

110

 

 

 

120

 

 

 

120

 

 

 

130

14.99

220.2

-8.49

130

 

 

 

140

15.16

220.2

-8.32

140

 

 

 

150

15.31

220.8

-8.18

150

 

 

 

160

15.44

222.1

-8.07

160

 

 

 

170

15.56

224.0

-7.99

170

 

 

 

180

15.67

226.3

-7.92

180

15.08

265.0

-9.17

190

15.76

228.7

-7.87

190

 

 

 

200

15.85

231.2

-7.83

200

15.54

242.1

-8.33

210

 

 

 

210

 

 

 

220

 

 

 

220

15.76

232.9

-7.95

230

 

 

 

230

15.81

231.4

-7.87

240

 

 

 

240

15.85

232.0

-7.84

250

16.19

238.1

-7.61

250

15.91

234.5

-7.83

260

 

 

 

260

 

 

 

270

 

 

 

270

16.03

238.0

-7.77

280

 

 

 

280

 

 

 

290

 

 

 

290

16.15

235.2

-7.60

300

16.38

235.3

-7.37

300

16.22

233.0

-7.49

310

16.40

234.1

-7.33

310

16.29

231.3

-7.39

320

16.42

232.9

-7.29

320

16.36

230.6

-7.31

330

16.44

231.8

-7.25

330

16.41

230.8

-7.26

340

16.45

230.6

-7.22

340

16.45

231.9

-7.24

350

16.46

229.6

-7.19

350

16.48

233.5

-7.24

360

16.47

228.8

-7.17

360

16.50

235.2

-7.25

370

16.47

228.2

-7.15

370

 

 

 

380

16.48

227.8

-7.14

380

 

 

 

390

16.48

227.6

-7.13

 

 

 

 

*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

2741

3278

19.42

238.6

-4.36

2.7

Per DL6WU formula

3800

3480

19.64

233.3

-4.04

2.7

For max G/T

1420

3300

18.30

220.5

-5.13

2.7

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)

3800

3480

22.66

231.6

-0.99

2.7

1380

3300

20.67

220.8

-2.77

2.7

 

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)

1380

3300

23.67

214.8

+0.35

2.7

3800

3420

25.65

231.1

+2.01

2.7