ANTENNA X21405XL5Q

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

14.16

34.87

-

16.16

41.8

34.4

225.8

-9.38

5.1

 

WORKING CONDITION:

Frequency for SWR=1.5 (MHz)

Z (Ώ)

at 144.100 MHz

SWR at 145.000 MHz

Lowest

Highest

Bandwidth

140.000

146.700

6.700

197.6

1.06:1

 

DIMENSIONS:

 

Ref

De

D1

D2

D3

D4

D5

D6

Dimensions given in milimetres

Diameter of elements 5 milimetres

No boom correction included.

 

Pos

0

256

438

838

1256

1724

2408

2945

Length

1018

796

943

933

937

919

917

897

Height

0

230

235

395

525

615

655

655

 

CONSTRUCTION OF RADIATOR

H = 796

V = 230

= 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)

G0KSC 7LFA

1.39

10.62

48.0

1.19:1

2.84

2.49

16.53

1.8

248.9

-5.28

X21205XL5Q

1.41

12.01

197.6

1.06:1

3.80

3.80

18.14

5.1

226.1

-3.25

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

15.39

217.4

-8.03

120

 

 

 

130

15.57

216.4

-7.83

130

 

 

 

140

15.72

216.5

-7.68

140

 

 

 

150

15.85

217.3

-7.56

150

 

 

 

160

 

 

 

160

 

 

 

170

 

 

 

170

 

 

 

180

 

 

 

180

15.45

276.6

-8.98

190

 

 

 

190

 

 

 

200

16.36

226.5

-7.23

200

15.99

246.8

-7.96

210

 

 

 

210

 

 

 

220

 

 

 

220

16.28

235.4

-7.47

230

 

 

 

230

16.36

234.0

-7.35

240

 

 

 

240

16.42

231.6

-7.26

250

16.75

231.7

-6.93

250

16.48

231.4

-7.20

260

16.81

231.5

-6.87

260

16.54

232.5

-7.16

270

16.87

231.0

-6.80

270

16.59

235.0

-7.15

280

16.93

230.3

-6.73

280

 

 

 

290

16.97

229.5

-6.67

290

 

 

 

300

17.02

228.5

-6.60

300

16.74

238.7

-7.07

310

17.05

227.5

-6.56

310

16.81

236.4

-6.96

320

17.08

226.5

-6.51

320

16.88

233.4

-6.83

330

17.10

225.5

-6.47

330

16.95

230.5

-6.71

340

17.12

234.7

-6.43

340

17.02

228.2

-6.60

350

17.14

224.0

-6.40

350

17.07

226.6

-6.52

360

17.15

223.5

-6.38

360

17.12

225.9

-6.46

370

17.15

223.1

-6.38

370

17.15

225.8

-6.42

380

17.16

223.0

-6.36

380

17.17

226.2

-6.41

 

 

 

 

390

17.19

226.9

-6.40

*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

3518

20.05

233.7

-3.64

5.1

Per DL6WU formula

3800

3800

20.29

226.1

-3.25

5.1

For max G/T

1400

3700

18.84

215.0

-4.49

5.1

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

23.32

224.7

-0.20

5.1

 

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

23.33

231.1

-0.31

5.1

 

 

 

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

26.35

229.6

+2.74

5.1