Linked from
The 26 pages that link to Amplitude modulation, each with the reason it gives.
Radio broadcastingRelated: AM stations vary carrier amplitude to carry audio over radio waves.
Radio receiverRelated: Simple envelope detectors can recover audio from many AM broadcasts.
Shortwave radioRelated: Traditional shortwave broadcasting commonly uses amplitude modulation.
Golden Age of RadioRelated: AM transmission carried most early mass-audience radio programs.
Reginald FessendenRelated: Fessenden used amplitude modulation to transmit speech over radio.
DemodulationRelated: Its envelope contains the information that simple detectors can recover.
Crystal radioRelated: The detector recovers audio from the carrier's changing amplitude.