ANTENNA X21608XL2Q

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)

16

3605

14.94

28.67

25.37

16.48

38.7

29.8

225.6

-8.69

4.5

 

WORKING CONDITION:

Frequency for SWR=1.5 (MHz)

Z (Ώ)

at 144.100 MHz

SWR

at 145.000 MHz

Lowest

Highest

Bandwidth

141.000

146.600

5.600

199.1

1.07:1

 

DIMENSIONS:

 

Ref

De

D1

D2

D3

D4

D5

D6

D7

Dimensions given in milimetres

Diameter of elements 8 milimetres

No boom correction included.

 

Pos

0

238

398

768

1204

1684

2336

3034

3605

Length

1012

792

931

927

933

919

907

903

891

Height

0

230

230

385

520

615

695

705

695

 

CONSTRUCTION OF RADIATOR

H = 792

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)

X21608XL2Q

1.73

12.73

199.1

1.07:1

3.80

4.10

21.00

4.5

223.5

-2.49

G0KSC 8LFA

1.79

11.06

50.0

1.24:1

3.15

2.40

16.95

3.6

222.2

-4.37

W1JR 8 MOD

1.80

11.14

50.0

1.14:1

3.07

2.75

16.99

5.3

256.7

-4.95

DJ9BV 1.8

1.80

11.34

77.5

1.34:1

3.16

2.80

17.28

5.5

261.2

-4.74

K1FO 10

1.84

11.34

29.4

1.44:1

3.10

2.78

17.27

4.3

257.7

-4.69

Vine 8 FD

1.85

11.18

51.4

1.12:1

3.00

2.63

17.06

8.5

232.3

-4.45

YU7EF 8

1.87

11.31

48.5

1.21:1

3.04

2.71

17.23

3.8

242.1

-4.46

BQH8B

1.88

11.60

50.0

1.29:1

3.28

2.97

17.62

7.2

259.3

-4.37

UR5EAZ 9

1.89

11.32

49.2

1.01:1

3.07

2.75

17.26

3.6

249.7

-4.56

G4CQM 8

1.91

11.52

49.5

1.11:1

3.15

2.83

17.45

5.1

248.5

-4.35

KF2YN Boxkite9

1.92

13.98

49.2

1.28:2

4.45

3.70

19.95

5.6

228.6

-1.48

CT1FFU 8

1.94

11.28

27.1

1.05:1

2.96

2.62

17.10

2.9

232.3

-4.41

G0KSC 8OWL

1.95

11.63

48.9

1.26:1

3.13

2.82

17.55

4.6

235.7

-4.02

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

 

 

 

130

 

 

 

140

16.18

223.4

-7.35

140

 

 

 

150

16.36

222.4

-7.16

150

 

 

 

160

16.52

222.3

-6.99

160

 

 

 

170

16.66

222.8

-6.86

170

 

 

 

180

 

 

 

180

 

 

 

190

 

 

 

190

 

 

 

200

17.00

225.8

-6.58

200

15.85

268.8

-8.46

210

 

 

 

210

 

 

 

220

 

 

 

220

 

 

 

230

 

 

 

230

 

 

 

240

 

 

 

240

 

 

 

250

17.40

228.9

-6.24

250

16.90

229.4

-6.75

260

 

 

 

260

17.02

226.2

-6.57

270

 

 

 

270

17.12

223.9

-6.42

280

 

 

 

280

17.21

223.2

-6.32

290

 

 

 

290

17.27

224.6

-6.29

300

17.67

226.5

-5.92

300

 

 

 

310

 

 

 

310

 

 

 

320

17.74

224.8

-5.82

320

 

 

 

330

17.77

224.0

-5.78

330

 

 

 

340

17.79

223.4

-5.74

340

17.54

230.1

-6.12

350

17.81

222.9

-5.71

350

17.60

228.3

-6.02

360

17.83

222.6

-5.69

360

17.66

226.6

-5.93

370

17.84

222.5

-5.68

370

17.71

225.4

-5.86

380

17.85

222.6

-5.67

380

17.76

224.7

-5.80

390

17.85

223.0

-5.68

390

17.79

224.7

-5.77

400

17.85

223.4

-5.69

400

17.82

225.2

-5.75

 

 

 

 

410

17.84

226.1

-5.74

 

 

 

 

420

17.85

227.0

-5.75

*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

3147

4019

20.82

227.9

-2.75

4.5

Per DL6WU formula

3800

4100

21.00

223.5

-2.49

4.5

For max G/T

1620

3900

19.57

223.3

-3.92

4.5

For lowest temperature

Four antennas in H-stack, H=3.80+3.80+3.80 V=4.10+4.10+4.10 metres

 

 

 

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

4100

23.99

223.2

+0.40

4.5

 

 

 

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

4100

26.96

232.0

+3.31

4.5

 

SIXTEEN ANTENNAS AT H=3.80+3.80+3.80 AND V=4.10+4.10+4.10 METRES - DIAGRAMS