User manual

SM User Manual January 2004
Software Release 4.1
Canopy™ System
Calculator
Automatically calculate
Inner Radius of Vertical Beam Width
Outer Radius of Vertical Beam Width
Distance from near -3 dB to far -3 dB
from known
Angle of Antenna Downward Tilt
Elevation of Antenna
Vertical Beam Width
Elevation of antenna (meters)
Elevation of antenna (feet)
Angle of antenna downward tilt (from 0-degree horizontal)
Angle of vertical beam width (from -3 dB to -3 dB)
Inner radius of vertical beam width (kilometers)
Outer radius of vertical beam width (kilometers)
Distance from near -3 dB to far -3 dB (kilometers)
Inner radius of vertical beam width (miles)
Outer radius of vertical beam width (miles)
Distance from near -3 dB to far -3 dB (miles)
Determinants
Results
Enter Values
Read Values
Figure 17: Canopy System Calculator page for beam width
5.3.2 Radio Horizon
Because the surface of the earth is curved, higher module elevations are required for greater link
distances. This effect can be critical to link connectivity in link spans that are greater than 8 miles
(12 km). The Canopy System Calculator page
AntennaElevationCalcPage.xls automatically
calculates the minimum antenna elevation for these cases, presuming no landscape elevation
difference from one end of the link to the other. Figure 18 displays an image of this file.
Issue 5 Page 49 of 119