Radio/Audio broadcasting [1919 to 1950s]

Crystal set was the most common type of receiver before vacuum tubes, although some old radios used some type of amplification through electric current. Inventions of the triode amplifier, motor-generator, detector etc enabled audio radio. The use of amplitude modulation make more than one station can simultaneously send signals.

During the middle of 1920s, amplifying vacuum revolutionized radio transmitters and receivers. John Fleming developed an earlier tube known as an oscillation valve. The Dutch engineer Hanso Schotanus  made the first regular wireless broadcast. Hanso Schotanus broadcast his popular program four nights per week until 1924.

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