Radio wave modulation – AM and FM

PhysicsOscillations & WavesAges 16–17

An audio-frequency signal cannot travel far on its own, so it must be carried by a high-frequency carrier wave. Adjust the signal frequency, carrier frequency, and modulation depth to compare amplitude modulation (AM), where the carrier's amplitude varies, with frequency modulation (FM), where its frequency varies, and see why FM resists amplitude noise better.