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Figure 23: Fade Margin Graphs For LOS, OLOS and NLOS
The graph assumes a fade margin of 3 dB. The effects of rain at bands are negligible,
hence are not included in the link budget.
It is important to note the link calculation assumes that the Earth's curvature is not
blocking the propagation path. The equation for determining the distance at which the
Earth will cause blockage is called the Radar Horizon, and is given as follows:
where,
h
is the height of terminal 1 (m)
1
h
is the height of terminal 2 (m)
2
The table below specifies the horizon distance (km) that can be achieved for different
terminal heights ranging from 10 to 70 m above mean terrain level.
Table 10: Radar Horizon Ranges For Different Terminal Heights (H
10
20
H
30
1
40
50
60
70
Redline Communications
h +
R
=
4
( 1 .
h
1
10
20
30
25.9
31.3
35.4
31.3
36.7
40.8
35.4
40.8
44.9
38.9
44.3
48.4
42.0
47.3
51.4
44.7
50.1
54.2
47.3
52.6
56.8
Page 71 of 80
AN-30 System User Manual
h
)
(km)
2
H
2
40
50
38.9
42.0
44.3
47.3
48.4
51.4
51.9
54.9
54.9
58.0
57.7
60.7
60.2
63.3
.....solving the first mile challenge
and H
)
1
2
60
70
44.7
47.3
50.1
52.6
54.2
56.8
57.7
60.2
60.7
63.3
63.5
66.1
66.1
68.6
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