(FSPL)isthelossinsignal strengthofanelectromagneticwavethatwouldresultfromaline-of-sight paththroughfreespace,withnoobstaclesnearbytocausereflectionor diffraction.TheFSPLappersinvacuumunderideallyconditions,e.g.aradio communicationbetweensatellites.Itisacriterionforthederivationofthe radarequationtoo. Free-spacepower...