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radio begins
marconi sent and recieved the first radio signal, but there is possibility that he did not. -
radio on water
the British Marconi company was established in 1897 and began communication between coast radio stations and ships at sea. This company, along with its subsidiaries Canadian Marconi and American Marconi, had a stranglehold on ship to shore communication. -
amp
The invention of amplitude-modulated (AM) radio, so that more than one station can send signals is attributed to Reginald Fessenden and Lee de Forest. On Christmas Eve 1906. -
broadcast
In April 1909 Charles David Herrold, an electronics instructor in San Jose, California constructed a broadcasting station. -
first
On March 8, 1916, Harold Power with his radio company American Radio and Research Company (AMRAD), broadcast the first continuous broadcast in the world from Tufts University under the call sign 1XE (it lasted 3 hours). -
vacuum
During the mid-1920s, amplifying vacuum tubes (or thermionic valves in the UK) revolutionized radio receivers and transmitters -
fines
When radio was introduced in the 1920s many predicted the end of records. -
fm
In 1933, FM radio was patented by inventor Edwin H. Armstrong. FM uses frequency modulation of the radio wave to reduce static and interference from electrical equipment and the atmosphere. -
mobile
In 1947 AT&T commercialized the Mobile Telephone Service. From its start in St. Louis in 1946, AT&T then introduced Mobile Telephone Service to one hundred towns and highway corridors by 1948. -
war
After World War II, the FM radio broadcast was introduced in Germany. In 1948, -
regency
In 1954 Regency introduced a pocket transistor radio, the TR-1, powered by a "standard 22.5V Battery".