ANTENNA X21208XL5Q

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

13.50

40.36

--

16.96

44.5

37.7

233.1

-10.18

3.3

 

WORKING CONDITION:

Frequency for SWR=1.5 (MHz)

Z (Ώ)

at 144.100 MHz

SWR at 145.000 MHz

Lowest

Highest

Bandwidth

141.200

146.400

5.200

200.0

1.09:1

 

DIMENSIONS:

 

Ref

De

D1

D2

D3

D4

D5

Dimensions given in milimetres

Diameter of elements 8 milimetres

No boom correction included.

 

Pos

0

240

402

758

1197

1753

2305

Length

1012

776

918

927

935

923

897

Height

0

240

230

390

525

595

635

 

CONSTRUCTION OF RADIATOR

H = 790

V = 240

= 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)

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

X21208XL5Q

1.11

11.32

200.0

1.09:1

3.80

3.42

17.45

3.3

234.1

-4.08

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

14.98

221.6

-8.52

130

 

 

 

140

15.14

221.6

-8.36

140

 

 

 

150

15.28

222.4

-8.24

150

 

 

 

160

15.41

223.9

-8.14

160

 

 

 

170

15.52

226.0

-8.06

170

 

 

 

180

15.62

228.6

-8.01

180

15.09

268.9

-9.22

190

15.71

231.3

-7.97

190

 

 

 

200

15.79

234.0

-7.94

200

15.52

248.5

-8.46

210

 

 

 

210

 

 

 

220

 

 

 

220

15.74

239.3

-8.08

230

 

 

 

230

15.81

236.7

-7.97

240

 

 

 

240

15.86

235.5

-7.90

250

16.14

241.0

-7.71

250

15.90

237.3

-7.89

260

 

 

 

260

 

 

 

270

 

 

 

270

16.00

242.0

-7.87

280

 

 

 

280

 

 

 

290

 

 

 

290

16.13

238.3

-7.67

300

16.35

237.6

-7.44

300

16.20

235.6

-7.56

310

16.37

236.3

-7.40

310

16.26

233.8

-7.47

320

16.40

235.0

-7.35

320

16.34

232.5

-7.36

330

16.41

233.8

-7.32

330

16.39

232.6

-7.31

340

16.43

232.6

-7.27

340

16.43

233.5

-7.29

350

16.44

231.6

-7.25

350

16.46

235.1

-7.29

360

16.45

230.7

-7.22

360

16.48

237.0

-7.30

370

16.45

230.1

-7.21

370

 

 

 

380

16.46

229.7

-7.19

380

 

 

 

390

16.45

229.5

-7.20

 

 

 

 

*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

3220

19.36

241.1

-4.46

3.3

Per DL6WU formula

3800

3420

19.60

234.1

-4.08

3.3

For max G/T

1420

3300

18.29

220.4

-5.14

3.3

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

3420

22.63

232.7

-1.04

3.3

1380

3300

20.66

220.7

-2.78

3.3

 

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

23.66

214.9

+0.34

3.4

3800

3420

25.64

232.8

+1.97

3.3