User manual

SM User Manual January 2004
Software Release 4.1
Tx
power
T
x antenna
loss
Tx
cable
loss
Rx antenna
gain
Rx
cable
loss
Rx
signal
level
Transmitter
or Amplifier
receiver
or amplifier
distance
free space signal
transmitter
or amplifier
Figure 22: Determinants in Rx signal level
Rx signal level is calculated as follows:
Rx signal level dB =
Tx power − Tx cable loss + Tx antenna gain − free space path loss
+
Rx antenna gain − Rx cable loss
NOTE: This Rx signal level calculation presumes that a clear line of sight is established
between the transmitter and receiver and that no objects encroach in the Fresnel zone.
The Canopy System Calculator page
PathLossCalcPage.xls automatically calculates free space
path loss. Figure 23 displays an image of this page.
Issue 5 Page 54 of 119