Radio technique has many fathers. The Italians, the British, of course, the Americans, and the Russians claim to have invented the radio technique themselves. They also mention the name of Ernst Alexanderson...
They also mention the name of Ernst Alexanderson who invented the so-called high-frequency alternator and worked for the General Electric Company for 46 years.
Entering the business in 1904, Alexanderson was the person who enabled the first experimental radio broadcast in America in 1906.
Who is Ernst Alexanderson?
(1878-1975) Swedish-American electrical engineer and inventor. With his inventions in the field of electronics, he has been one of the pioneers of the development of the radio and television technology. Ernst Frederik Werner Alexanderson was born on January 25, 1878 in Uppsala. After completing his technical education in Stockholm and Berlin, he settled in the USA in 1901. The following year, he started working at the General Electric Company. He continued all his research in the laboratories of this organization until his retirement in 1948. He became a consultant to the Radio Corporation of America (RCA) in 1952. When he died on May 14, 1975, in Schenectady, New York State, over 300 patents were registered to his name.
Alexanderson began working with Steinmetz in 1902 at General Electric, the first major U.S. corporation in the field of electric motors and electrical appliances. The high-frequency alternator, which he made in 1906, is his most important invention that revolutionized all communication techniques using radio waves. This vehicle, which produces radio waves at frequencies between 3,000 and 30,000 kHz, enabled the first sound and music broadcast with radio transmitters, and also led to great developments in radio communication. Alexanderson further developed the alternator, making it usable for overseas radio and radio broadcasting; then he built receiving and transmitting antennas and developed telephone relays (Hertz relays) that allow many telephone conversations to take place at the same time. The selective tuner mechanism, which he patented in 1916, is an indispensable part of modern radio systems even today and allows a radio receiver to receive only carrier waves at a certain frequency to which it is tuned, and to obtain a clear broadcast by eliminating close frequencies.
Again, Alexanderson's invention, the "amplifying", is a simple precursor of automatic control mechanisms that find numerous uses today with the development of automation and cybernetics. This device, which is a direct current amplifier, automatically increases or decreases the amplification power of the receiver according to the signal intensity, which often decreases and increases due to the change in electron density in the ionosphere.