Motorola Canopy 150 Mbps Backhaul, Руководство пользователя

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Issue 1.1 April 2006 Page 136
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
P
2
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.
Lateral Force (Pound) at wind speed (mph) Largest Surface
Area (sq ft)
80 100 120 140 150
150/300 Mbps
Backhaul 1.36 37 57 82 112 129
150/300 Mbps
Backhaul -C 1.00 27 42 60 82 95
Table 15: Lateral Force – Imperial
Lateral Force (kg) at wind speed (m/s) Largest Surface
Area (sq m)
30 40 50 60 70
150/300 Mbps
Backhaul 0.130 12 22 34 49 66
150/300 Mbps
Backhaul -C 0.093 9 16 24 35 48
Table 16: Lateral Force – Metric
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.