Selecting Sites for Network Elements
PTP 450 Configuration and User
pmp-0815 (August 2015)
4-21
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 38
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
