- 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