Motorola MotoWI4 PTP 600 Series - Manual (Page 50)

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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).
capability seasonal fade excess space free
L L L L L
< + + +
_
Where
space free
L
_
Free Space Path Loss (dB)
excess
L Excess Path Loss (dB)
fade
L Fade Margin Required (dB)
seasonal
L Seasonal Fading (dB)
capability
L Equipment Capability (dB)
Equation 1 - Path Loss