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A contact is an exchange of information between two amateur radio stations, often referred to as a QSO. Learn about the history, terminology, and logging of amateur radio contacts.
Radio is the technology of communicating using radio waves, which are electromagnetic waves of a certain frequency. Learn about the origin, development and uses of radio, from Hertz's discovery to Marconi's transatlantic signal to modern wireless devices.
Learn about the various modes of radio communication used in the amateur radio hobby, from Morse code to digital voice to image and data. Compare the modulation types, operating protocols, and features of each mode.
QRP operation is a hobby of transmitting at reduced power while maximizing effective range. Learn about the history, philosophy, practice, equipment, modes, and organizations of QRP enthusiasts.
Learn about the origins, development, and practices of amateur radio, also known as ham radio, a non-commercial use of the radio spectrum for exchange of messages, experimentation, and recreation. Find out how amateur radio operators communicate across the world using various voice, text, image, and data modes, and how they contribute to science, engineering, and social services.
Learn how radio technology evolved from the discovery of electromagnetic waves to the invention of wireless telegraphy and broadcasting. Explore the contributions of scientists and inventors such as Hertz, Lodge, Marconi, Bose and more.
Learn about the history, technology and applications of AM radio, the first method of radio broadcasting using amplitude modulation. Find out how AM radio evolved from experimental transmissions to a dominant medium in the 20th century, and how it faces competition from other media today.
A family listening to a crystal radio in the 1920s Greenleaf Whittier Pickard's US Patent 836,531 "Means for receiving intelligence communicated by electric waves" diagram US Bureau of Standards 1922 Circular 120 "A simple homemade radio receiving outfit" taught Americans how to build a crystal radio.