Amplitude Modulation

• Vary amplitude (loudness) of the signal

  • High amplitude means 1 (or the opposite)
  • Low amplitude means 0 (or the opposite)
  • In a bit period, keep amplitude high to send a 1
  • In a bit period, keep amplitude low to send a 0
  • To send 1011, send LOUD-LOUD-soft-LOUD

• Radios that use Amplitude Modulation: HAVEQUICK, Air Traffic Control, VHF-AM

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