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13
Wind Loading
13.1 General
Antennas and electronic equipment mounted on towers or pole mounted on buildings will
subject the mounting structure to lateral forces when there is appreciable wind. Antennas are
normally specified by the amount of force (in pounds) for specific wind strengths.
The magnitude of the force depends on both the wind strength and size of the antenna.
13.2 Calculation of Lateral Force
The 150/300 Mbps Backhaul unit with or without the integral antenna is essentially a flat
structure and so the magnitude of the lateral force can be estimated from:
Force (in pounds) = 0.0042. A. v
Where A is the surface area in square feet and v is the wind speed in miles per hour.
The lateral force produced by a single 150/300 Mbps Backhaul unit, or a connectorized unit
(150/300 Mbps Backhaul -C), at different wind speeds is shown in Table 15 and Table 16.
150/300 Mbps
Backhaul
150/300 Mbps
Backhaul -C
150/300 Mbps
Backhaul
150/300 Mbps
Backhaul -C
Note : When the connectorized version of Canopy 150/300 Mb BH (150/300 Mbps Backhaul -
C) is used with external antennas, the figures from the antenna manufacturer for lateral force
should be included to calculate to total loading on the mounting structure.
Issue 1.1 April 2006
2
P
Largest Surface
Area (sq ft)
1.36
1.00
Table 15: Lateral Force – Imperial
Largest Surface
Area (sq m)
0.130
0.093
Table 16: Lateral Force – Metric
Lateral Force (Pound) at wind speed (mph)
80
100
120
37
57
82
27
42
60
Lateral Force (kg) at wind speed (m/s)
30
40
50
12
22
34
9
16
24
140
150
112
129
82
95
60
70
49
66
35
48
Page 136
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