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

When you transmit to an amateur satellite (the uplink) using too much power, the satellite's receiver or repeater can be captured by your strong signal. Many satellites share a fixed amount of downlink power among all users in the passband, so if your signal is excessively strong, the satellite will dedicate most of its transmitter power to repeating just your signal. This effectively "hogs" the satellite's bandwidth and power, preventing weaker signals from being received or relayed. Consequently, other users are blocked from accessing the satellite and making contacts. The distractors mentioning improper modes, overloading batteries, or rebooting computers are incorrect. Satellites are designed with safeguards against these specific hardware failures; excessive power simply degrades the experience for everyone else on the air.