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Hitachi Kokusai Electric Inc. SL24G-US-02 Manuel D’Utilisation

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1-8 Antenna directivity
 
15 
 
1-8
 
Antenna directivity 
 
To make communication as stable as possible when there is a opposed device, the antenna is directed within 
a 0.5˚ cone to the left, right, up, and down from a line perpendicular to the surface of the antenna.   
When the distance to the opposed device is 1km, 0.5˚ creates a circle with an 8.7m radius. 
 
 
 
 
 Antenna 
directivity 
 
Horizontal direction ±0.5˚ 
 
 
 
 
 
Vertical direction ±0.5˚ 
 
 
 
 
 
 
Antenna pattern 
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
-30
-20
-10
0
10
20
30
Angle(degree)
Ga
in
(d
B
)
-8
-7
-6
-5
-4
-3
-2
-1
0
-2
-1
0
1
2
Angle(degree)
Ga
in
(d
B
)
 
 
 
 
 
 
Most stable 
communication 
status 
Range of half value