Radio Broadcasting

The Birth of Mass Media

Radio broadcasting represents one of the most transformative technological developments of the 20th century. For the first time in human history, entertainment and information could be delivered simultaneously to millions of people across vast distances. The voice of a singer, the drama of a baseball game, the breaking news of a presidential election—all could now reach living rooms across an entire nation in real-time.

While experimental broadcasting existed earlier, the birth of commercial radio broadcasting is generally dated to November 2, 1920, when KDKA in Pittsburgh, Pennsylvania, broadcast the results of the Harding-Cox presidential election to an estimated audience of several thousand listeners. This event marked the transition from amateur wireless communication to a new era of mass media broadcasting.

The Pioneering Years (1920-1925)

The early 1920s saw explosive growth in radio broadcasting. Within two years of KDKA's landmark broadcast, hundreds of stations had sprung up across the United States, though many operated with low power and limited schedules.

Key early stations included:

• KDKA Pittsburgh - First commercially licensed station, November 1920
• WEAF New York - First entertainment programming, August 1922
• WCCO Minneapolis - Pioneered live sports coverage
• KMOX St. Louis - Became known as "the station of the stars"
• WLS Chicago - Country music and agricultural programming

The Radio Corporation of America (RCA), formed in 1919 by General Electric and Westinghouse, played a crucial role in developing broadcasting technology. RCA introduced the Radiola, an affordable home receiver, and launched the National Broadcasting Company (NBC) in 1926, the first national radio network.

The Network Era (1926-1940)

The creation of NBC in 1926 marked the beginning of national radio networking. Using newly developed telephone lines, programs could be broadcast simultaneously from New York to stations across the country. This innovation allowed entertainment and news to reach audiences far beyond the range of any single station.

NBC was followed by the Columbia Broadcasting System (CBS), founded in 1927, and later the Mutual Broadcasting System (1934). These networks competed fiercely for audiences, developing programming strategies that would later be applied to television.

The network era introduced several lasting formats:

• Variety Shows - Comedy, music, and skits (e.g., The Jack Benny Program)
• Soap Operas - Daytime drama aimed at housewives, sponsored by soap companies
• News Programs - Evening news summaries became essential
• Live Sports - Baseball, boxing, and football reached national audiences
• Children's Programming - Adventure shows like The Lone Ranger

The Golden Age of Radio (1930-1950)

The period from 1930 to 1950 is often called radio's "Golden Age," though technically this era peaked in the late 1930s and early 1940s. During this time, radio evolved from a novelty to the primary source of entertainment and information for most Americans.

The Golden Age saw the development of sophisticated radio drama. Without visual cues, actors and sound effects had to paint pictures in listeners' minds. Productions like The Mercury Theatre on the Air, directed by Orson Welles, demonstrated the medium's power to captivate and even terrify audiences. The infamous 1938 War of the Worlds broadcast caused panic among listeners who tuning in late missed the introduction and believed an actual Martian invasion was occurring.

Comedy also flourished. Burns and Allen, The Fibber McGee and Molly Show, The Adventures of Ozzie and Harriet, and countless others provided weekly entertainment that became part of American family life. The comedy-variety format, with its musical performances, guest stars, and running gags, set standards that television would later adopt.

Radio and World War II

Radio played a crucial role during World War II, both as a tool of propaganda and as a means of maintaining morale. The war accelerated technical developments including FM stereo, which Edwin Armstrong had invented in 1933 but which did not achieve widespread adoption until after the war.

Edward R. Murrow's broadcasts from London during the Blitz brought the reality of war into American homes. His famous phrase, "This is London," became iconic. Murrow's unflinching reports from the rooftops during bombing raids demonstrated radio journalism's power to convey truth during wartime.

The Office of War Information (OWI) coordinated government messaging, while the Armed Forces Radio Service (AFRS) provided entertainment to troops overseas. Post-war, many AFRS programs would become foundation shows for American television.

Technical Developments

Early radio broadcasting used amplitude modulation (AM), which varies the strength of the carrier wave to encode audio information. While AM allowed broadcasts to travel long distances, especially at night via skywave propagation, it was susceptible to static and interference.

Edwin Armstrong's invention of FM broadcasting in 1933 offered significant advantages including:

• Immunity to static and man-made interference
• Higher audio fidelity with wider frequency response
• No nighttime fading or skywave interference
• Less transmitted power required for equivalent coverage

The FCC allocated the 88-108 MHz band for FM broadcasting in 1939, but FM did not surpass AM in popularity until the 1960s and 1970s, when higher audio quality became more valued and rock and roll radio embraced FM's superior sound.

Decline and Transformation (1945-1960)

The post-war period brought challenges for radio broadcasting. Television, which had grown during the war years, emerged as the dominant entertainment medium. By 1955, more households owned television sets than radio sets, and the networks shifted their prime-time programming to TV.

Radio adapted by:

• Focusing on music and shorter formats suited to commuting
• Developing Top 40 format that emphasized hit songs and personalities
• Transitioning to FM for music while AM focused on talk and news
• Becoming local rather than national, with local DJs and programming

This transformation, while painful, ultimately created radio's modern identity as a medium for music discovery and local community connection that would persist into the streaming era.