User Manual

Selecting Sites for Network Elements Planning considerations
2-28
pmp-0047 (December 2012)
Calculating the Aim Angles
The proper angle of tilt can be calculated as a factor of both the difference in elevation and the distance that the link
spans. Even in this case, a plumb line and a protractor can be helpful to ensure the proper tilt. This tilt is typically
minimal.
The number of degrees to offset (from vertical) the mounting hardware leg of the support tube is equal to the angle
of elevation from the lower module to the higher module (<B in the example provided in Figure 15).
Figure 15 Variables for calculating angle of elevation (and depression)
Where: Is:
b angle of elevation
B vertical difference in elevation
A horizontal distance between modules
Calculating the Angle of Elevation
To use metric units to find the angle of elevation, use the following formula:
Where: Is:
B expressed in meters
A expressed in kilometers
To use English standard units to find the angle of elevation, use the following formula:
Where: Is:
B expressed in feet
A expressed in miles
The angle of depression from the higher module is identical to the angle of elevation from the lower module.
tan b =
B
1000A
tan b =
B
5280A