What is the impact of using excessive effective radiated power on a satellite uplink?

Amateur satellites use linear transponders or FM repeaters that have a limited total power output. When a ground station transmits to the satellite (the uplink) using excessive Effective Radiated Power (ERP), the satellite's receiver and transmitter devote a disproportionate amount of their limited available power to retransmitting that single strong signal. This phenomenon effectively reduces the satellite's ability to hear and relay weaker signals from other stations. Consequently, using too much uplink power 'hogs' the transponder and blocks access by other users, which violates good amateur practice. Operators should always use the minimum power necessary to establish contact.