Path Loss Considerations - Motorola PTP 600 Series User Manual

6.1.3

Path Loss Considerations

The path loss is the amount of attenuation the radio signal undergoes between the two ends
of the link. The path loss is the sum of the attenuation of the path if there were no obstacles in
the way (Free Space Path Loss), the attenuation caused by obstacles (Excess Path Loss)
and a margin to allow for possible fading of the radio signal (Fade Margin).
L
Where
L
L
L
L
L
+ +
L L
free _ space excess fade
Free Space Path Loss (dB)
free _ space
Excess Path Loss (dB)
excess
Fade Margin Required (dB)
fade
Seasonal Fading (dB)
seasonal
Equipment Capability (dB)
capability
Equation 1 - Path Loss
+ <
L L
seasonal capability
47