What mode of transmission is commonly used by amateur radio satellites?

Amateur radio satellites are highly versatile and act as orbiting repeaters or transponders in space. Depending on the specific satellite's design, they can support a wide variety of transmission modes. FM is very popular for Low Earth Orbit (LEO) satellites because it allows operators to make contacts using basic, readily available handheld transceivers. Linear transponders on other satellites commonly support Single Sideband (SSB) and Continuous Wave (CW), which are highly efficient for weak-signal work over long distances. Digital data modes are also frequently used for telemetry and packet radio, meaning all these modes are commonly found in satellite operations.