ANTENNA X21810XL4Q

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)

18

4365

15.54

25.94

22.78

17.32

36.2

28.2

223.3

-7.95

3.6

 

WORKING CONDITION:

Frequency for SWR=1.5 (MHz)

Z (Ώ)

at 144.100 MHz

SWR

at 145.000 MHz

Lowest

Highest

Bandwidth

141.000

146.300

5.300

202.4

1.08:1

 

DIMENSIONS:

 

Ref

De

D1

D2

D3

D4

D5

D6

D7

D8

Dimensions given in milimetres

Diameter of elements 10 milimetres

No boom correction included.

 

Pos

0

235

409

784

1212

1704

2326

3018

3726

4365

Length

1010

792

917

925

921

907

895

891

887

871

Height

0

230

225

385

515

615

695

735

735

715

 

CONSTRUCTION OF RADIATOR

H = 792

V = 230

= 10 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 9OWA

2.09

11.99

49.1

1.30:1

3.33

3.04

17.96

4.9

247.0

-3.82

X21810XL4Q

2.10

13.39

202.4

1.08:1

3.90

4.40

19.43

3.6

222.8

-1.90

RA3AQ 9S

2.12

12.04

47.1

1.08:1

3.35

3.06

18.02

4.7

246.5

-3.75

M2 9SSB

2.12

11.96

200.6

1.26:1

3.33

3.04

17.92

10.8

245.9

-3.84

WiMo WX220 XPOL

2.13

11.23

202.0

1.08:1

2.94

2.94

17.44

8.4

300.8

-5.19

Gulf Alpha 9

2.13

11.62

203.3

1.15:1

3.26

2.97

17.64

4.6

266.2

-4.46

Gulf Alpha 9 XPOL

2.13

11.60

203.9

1.15:1

3.12

3.12

17.62

5.0

267.6

-4.50

DJ9BV 2.1

2.13

11.89

44.9

1.30:1

3.33

3.04

17.87

5.8

255.2

-4.05

G0KSC 9LFA

2.14

11.97

50.5

1.08:1

3.26

2.94

17.88

5.2

235.1

-3.68

OZ5HF 9

2.16

11.52

38.0

1.15:1

3.21

2.92

17.47

3.0

272.6

-4.74

YU7EF 9

2.16

11.84

49.8

1.17:1

3.20

2.89

17.74

5.3

236.6

-3.84

 

Z(ohms) - measured on 144.100 MHz

Bandwidth VSWR measured on 145.000 MHz

 

DIAGRAMS (no loss included)

 

SWR DIAGRAMS (loss included for Al)

 

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

3348

4270

21.47

223.2

-2.02

3.6

Per DL6WU formula

3900

4400

21.58

222.8

-1.90

3.6

For max G/T

3800

4200

21.54

222.1

-1.93

3.6

For lowest temperature

Four antennas in H-stack, H=3.90  V=4.40 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)

3900

4400

24.61

222.6

+1.13

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)

3900

4400

27.60

227.1

+4.03

3.6

 

SIXTEEN ANTENNAS AT H=3.90+3.90+3.90 AND V=4.40+4.40+4.40 METRES - DIAGRAMS