User's Manual

AR24027 Operator’s Manual (rev A)
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Determine ideal antenna height by drawing a line on the graph between the sites and across the top of
the obstruction heights. Note the elevation at each antenna site.
The following section will show how to calculate the RSS level expected at the radio and to
determine the theoretical link margin at the sight.
Determine free-space path loss, using either table 3-1, the graph of figure 3-2, or the formula
following figure 3-2.
Table 3-1. Free-Space Path Loss at 2.4 GHz
Distance
(miles)
Path Loss
(dB)
Distance
(km)
Path Loss
(dB)
1 -104 1 -100
2 -110 2 -106
3 -114 3 -110
4 -116 4 -112
5 -118 5 -114
6 -120 6 -116
7 -121 7 -117
8 -122 8 -118
9 -123 9 -119
10 -124 10 -120
11 -125 15 -124
12 -126 20 -126
13 -126 25 -128
14 -127 30 -130
15 -128 35 -131
20 -130 40 -132
25 -132 45 -133
30 -134 50 -134
35 -135 55 -135
40 -136 60 -136
45 -137 70 -137
50 -138 80 -138