• Single Side Band (Amplitude Modulation)
  • Carrier is suppressed, generally by a balanced modulator
  • Information in both sidebands of an AM wave is identical so one sideband is suppressed, generally by a filter
  • Bandwidth equals that for speech – about 2.6kHz
  • No carrier, all power in sideband so more efficient, and no “beats” or heterodyne whistles
  • Transmission duty cycle 20% rising to 40% with speech processing