User manual

AP User Manual January 2004
Software Release 4.1
5.2.3 Antenna Downward Tilt
The appropriate angle of antenna downward tilt is derived from both the distance between
transmitter and receiver and the difference in their elevations. The Canopy System Calculator page
DowntiltCalcPage.xls automatically calculates this angle. Figure 14 displays an image of this file.
Canopy™ System
Calculator
Automatically calculate
Angle of Antenna Downward Tilt
from known
Distance from Transmitter to Receiver
Elevation of Transmitter
Elevation of Receiver
Distance from transmitter to receiver (kilometers)
Elevation of transmitter (meters)
Elevation of receiver (meters)
Distance from transmitter to receiver (miles)
Elevation of transmitter (feet)
Elevation of receiver (feet)
Angle of antenna downward tilt (from metric calculation)
Angle of antenna downward tilt (from English standard calculation)
Determinants
Results
Enter Values
Read Values
Figure 14: Canopy System Calculator page for antenna downward tilt
5.2.4 Fresnel Loss
The Fresnel (pronounced fre·NEL) Zone is a theoretical three-dimensional area around the line of
sight of an antenna transmission. Objects that penetrate this area can cause the received signal
strength of the transmitted signal to fade. Out-of-phase reflections and absorption of the signal
result in signal cancellation.
Issue 5 Page 43 of 102