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The idea of wireless communication predates the discovery of radio with experiments.
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In 1878, David E. Hughes noticed that sparks could be heard in a telephone receiver when experimenting with his carbon microphone.
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In 1900, Brazilian priest Roberto Landell de Moura transmitted the human voice wirelessly.
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Around the start of the 20th century, the Slaby-Arco wireless system was developed by Adolf Slaby and Georg von Arco.
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Stations can be linked in radio networks to broadcast a common radio format, either in broadcast syndication or simulcast or both.
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Teletypewriters automated encoding, and were adapted to pulse-code dialing to automate routing, a service called telex.
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AT&T then introduced Mobile Telephone Service to one hundred towns and highway corridors by 1948. Mobile Telephone Service was a rarity with only 5,000 customers placing about 30,000 calls each week.
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NTSC compatible color television introduced in the US.
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In 1954 Regency introduced a pocket transistor radio, the TR-1, powered by a standard 22.5V Battery.
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Radio was a free medium for the public to hear music for which they would normally pay. While some companies saw radio as a new avenue for promotion, others feared it would cut into profits from record sales and live performances.
