User's Guide

Site planning Chapter 2: Planning considerations
2-8
UNDER DEVELOPMENT
phn-2182_003v004 (Oct 2011)
The lateral force produced by a single PTP 250 ODU (integrated or connectorized model)
at different wind speeds is shown in Table 2-4.
Table 2-
4 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 2-5.
Table 2-
5 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
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.