Amateur radio operators talk to each other in many ways. Some people talk with their voice, others use computers, television, or Morse code. They use many ways to get their signals to others. Most use shortwave radio signals that bounce off the sky. Some bounce off the moon or a satellite. Amateur radio operators have many ways to talk using the radio. Amateur radio satellites are called OSCAR's - Orbital Satellites Carrying Amateur Radio. Hams can also talk to astronauts and cosmonauts aboard the International Space Station (ISS).