Motorola Motorola PTP 250, Руководство пользователя, Страница: 64 / 236

Site planning Chapter 2 Planning considerations
phn-2182_002v000
2-6
May 2011
The lateral force produced by a single PTP 250 ODU (integrated or connectorized
model) at different wind speeds is shown in
Table 2-2 .
Table 2-2 Lateral force – metric
Type of ODU Largest
surface area
(square meters) Lateral force (Kg) at wind speed
(meters per second)
30 40 50 60 70
Integrated 0.130 12 22 34 49 66
Connectorized 0.093 9 16 24 35 48
Calculation of lateral force (US)
The magnitude of the lateral force can be estimated from:
Force (in pounds) = 0.0042Av
2
Where: Is:
A surface area in square feet
v wind speed in miles per hour
The lateral force produced by a single PTP 250 ODU (integrated or connectorized
model) at different wind speeds is shown in
Table 2-3 .
Table 2-3 Lateral force – US
Type of ODU Largest
surface area
(square feet) Lateral force (lb) at wind speed
(miles per hour)
80 100 120 140 150
Integrated 1.36 36.6 57.1 82.3 146.2 228.5
Connectorized 1.00 26.9 42 60.5 107.5 168.0
NOTE
When the connectorized ODU is used with external antennas, the figures
from the antenna manufacturer for lateral force should be included to
calculate the total loading on the mounting structure.