User guide

Selecting Sites for Network Elements Engineering Your RF Communications

148

pmp-0229 (Mar 2013)

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 42).

Figure 42: 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

tan b =

1000A