ANTENNA X21408XL4Q

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

2945

14.20

34.09

-

16.59

41.8

34.2

224.5

-9.32

3.6

 

WORKING CONDITION:

Frequency for SWR=1.5 (MHz)

Z (Ώ)

at 144.100 MHz

SWR at 145.000 MHz

Lowest

Highest

Bandwidth

139.400

147.100

7.700

197.6

1.07:1

 

DIMENSIONS:

 

Ref

De

D1

D2

D3

D4

D5

D6

Dimensions given in milimetres

Diameter of elements 8 milimetres

No boom correction included.

 

Pos

0

269

438

819

1252

1722

2408

2945

Length

1016

798

933

923

929

907

903

885

Height

0

230

235

395

525

615

655

655

 

CONSTRUCTION OF RADIATOR

H = 798

V = 230

= 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)

G0KSC 7LFA

1.39

10.62

48.0

1.19:1

2.84

2.49

16.53

1.8

248.9

-5.28

X21208XL4Q

1.41

12.05

197.6

1.07:1

3.80

3.80

18.17

3.6

224.7

-3.20

DG7YBN 7

1.44

10.59

47.2

1.70:1

2.88

2.47

16.55

4.5

242.7

-5.15

Vine 7 FD

1.45

10.56

47.9

1.14:1

2.83

2.46

16.47

8.2

238.6

-5.16

G4CQM 7

1.50

10.76

50.7

2.31:1

2.89

2.53

16.69

7.9

239.9

-4.96

CT1FFU 7

1.54

10.82

28.0

1.02:1

2.87

2.50

16.70

2.8

237.7

-4.96

DK7ZB 7

1.57

11.11

28.4

1.64:1

3.16

2.84

17.13

5.8

272.6

-5.07

IK0BZY 6

1.63

11.11

19.5

2.27:1

3.10

2.77

17.04

4.8

266.5

-5.07

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

15.37

217.9

-8.06

120

 

 

 

130

15.56

216.6

-7.84

130

 

 

 

140

15.72

216.4

-7.68

140

 

 

 

150

15.86

217.0

-7.55

150

 

 

 

160

 

 

 

160

 

 

 

170

 

 

 

170

 

 

 

180

 

 

 

180

 

 

 

190

 

 

 

190

 

 

 

200

16.39

225.6

-7.18

200

16.00

245.3

-7.92

210

 

 

 

210

 

 

 

220

 

 

 

220

16.27

234.9

-7.47

230

 

 

 

230

16.35

232.9

-7.36

240

 

 

 

240

16.41

231.2

-7.27

250

16.78

230.4

-6.88

250

16.48

229.9

-7.17

260

16.84

230.2

-6.82

260

16.55

230.2

-7.11

270

16.90

229.8

-6.75

270

16.60

232.3

-7.09

280

16.95

229.1

-6.69

280

 

 

 

290

16.99

228.2

-6.63

290

 

 

 

300

17.03

227.3

-6.57

300

16.76

236.8

-7.01

310

17.07

226.3

-6.52

310

16.82

234.8

-6.92

320

17.09

225.3

-6.48

320

16.89

232.1

-6.80

330

17.11

224.4

-6.44

330

16.96

229.3

-6.68

340

17.13

233.6

-6.40

340

17.03

227.1

-6.57

350

17.15

222.9

-6.37

350

17.08

225.6

-6.49

360

17.15

222.4

-6.36

360

17.12

224.8

-6.44

370

17.16

222.1

-6.35

370

17.16

224.7

-6.40

380

17.16

222.1

-6.35

380

17.18

225.2

-6.39

 

17.16

222.2

-6.35

390

17.19

226.0

-6.39

*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

2916

3538

20.10

231.6

-3.55

3.6

Per DL6WU formula

3800

3800

20.32

224.7

-3.20

3.6

For max G/T

1440

3700

18.92

214.9

-4.41

3.6

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

3800

23.35

223.2

-0.14

3.6

 

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)

3800

3800

23.36

228.9

-0.24

3.6

 

 

 

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)

3800

3800

26.38

227.6

+2.81

3.6