ANTENNA X21005XL8Q

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)

10

1645

12.37

26.84

-

17.33

48.8

44.6

254.0

-11.68

4.2

 

WORKING CONDITION:

Frequency for SWR=1.5 (MHz)

Z (Ώ)

at 144.100 MHz

SWR at 145.000 MHz

Lowest

Highest

Bandwidth

140.700

146.400

5.700

200.4

1.07:1

 

DIMENSIONS:

 

Ref

De

D1

D2

D3

D4

Dimensions given in milimetres

Diameter of elements 5 milimetres

No boom correction included.

 

Pos

0

248

399

773

1218

1645

Length

1016

798

926

927

949

911

Height

0

220

225

375

510

540

 

CONSTRUCTION OF RADIATOR

H = 798

V = 220

= 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)

X21005XL3Q

0.79

10.22

200.4

1.07:1

3.60

2.90

18.43

4.2

249.5

-5.54

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

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

13.73

235.8

-10.02

110

 

 

 

120

13.92

236.0

-9.84

120

 

 

 

130

14.09

237.0

-9.69

130

 

 

 

140

14.23

238.7

-9.58

140

 

 

 

150

14.37

241.0

-9.48

150

 

 

 

160

14.49

243.8

-9.40

160

 

 

 

170

14.60

246.9

-9.35

170

 

 

 

180

14.70

250.3

-9.30

180

 

 

 

190

14.79

253.5

-9.27

190

 

 

 

200

14.87

256.5

-9.24

200

14.80

245.5

-9.12

210

14.94

259.0

-9.21

210

14.87

247.1

-9.08

220

15.01

260.8

-9.17

220

14.91

248.6

-9.07

230

15.07

262.0

-9.13

230

14.95

249.2

-9.04

240

15.13

262.6

-9.08

240

14.98

248.1

-8.99

250

15.18

262.6

-9.03

250

15.03

246.1

-8.90

260

15.22

262.2

-8.98

260

15.11

244.7

-8.80

270

15.25

261.3

-8.94

270

15.19

244.5

-8.72

280

15.28

26.02

-8.89

280

15.27

245.6

-8.66

290

15.30

258.9

-8.85

290

15.33

248.3

-8.64

300

15.32

257.4

-8.80

300

15.37

252.4

-8.67

310

15.34

255.9

-8.76

310

15.40

257.4

-8.72

320

15.35

254.5

-8.72

320

 

 

 

330

15.36

253.1

-8.69

330

 

 

 

340

15.36

251.9

-8.67

340

 

 

 

350

15.37

250.9

-8.65

350

 

 

 

360

15.37

250.2

-8.63

360

 

 

 

 

15.37

249.8

-8.63

 

 

 

 

*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

2518

2741

18.22

254.2

-5.83

4.2

Per DL6WU formula

3600

2900

18.43

249.5

-5.54

4.2

For max G/T

1180

2720

16.78

237.4

-6.99

4.5

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)

3600

2900

21.45

248.7

-2.51

4.2

 

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)

3600

2900

21.43

241.8

-2.41

4.2

 

 

 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)

3600

2900

24.45

241.1

+0.63

4.2