How Radio Works • Transmitters: A machine that changes sound or data into electric signals and sends them out as radio waves using an antenna. • Receivers: A machine with an antenna that catches those radio waves and changes them back into sounds you can hear. • Modulation: The process of adding information to the waves, usually using AM (Amplitude Modulation) or FM (Frequency Modulation). A Brief History • Foundations: James Clerk Maxwell described electromagnetic waves in 1865, and Heinrich Hertz proved they were real in 1886. • Invention: Guglielmo Marconi built the first practical wireless radio system in the mid-1890s. • Broadcasting: The first regular voice and music broadcasts started in the early 1920s, creating a new era of home entertainment and mass media. Common Uses • Music an