During the 1860s: Scottish physicist, James Clerk Maxwell predicted the existence of radio waves; and in 1886, German physicist, Heinrich Rudholph Hertz demonstrated that rapid variations of electric current could be projected into space in the form of radio waves similar to those of light and heat.
In 1866: Mahlon Loomis, an American dentist, successfully demonstrated "wireless telegraphy." Loomis was able to make a meter connected to one kite cause another one to move, marking the first known instance of wireless aerial communication.
Guglielmo Marconi: an Italian inventor, proved the feasibility of radio communication. He sent and received his first radio signal in Italy in 1895. By 1899 he flashed the first wireless signal across the English Channel and two years later received the letter "S", telegraphed from England to Newfoundland. This was the first successful transatlantic radiotelegraph message in 1902.
James Clerk Maxwell
Radio owes its development to two other inventions: the telegraph and the telephone. All three technologies are closely related, and radio technology actually began as "wireless telegraphy."
The term "radio" can refer to either the electronic appliance that we listen with or to the content that plays from it. In any case, it all started with the discovery of radio waves—electromagnetic waves that have the capacity to transmit music, speech, pictures, and other data invisibly through the air. Many devices work by using electromagnetic waves, including radios, microwaves, cordless phones, remote controlled toys, televisions, and more.
Scottish physicist James Clerk Maxwell first predicted the existence of radio waves in the 1860s. In 1886, German physicist Heinrich Rudolph Hertz demonstrated that rapid variations of electric current could be projected into space in the form of radio waves, similar to light waves and heat waves.
In 1866, Mahlon Loomis, an American dentist, successfully demonstrated "wireless telegraphy." Loomis was able to make a meter connected to a kite cause a meter connected to another nearby kite to move. This marked the first known instance of wireless aerial communication.
But it was Guglielmo Marconi, an Italian inventor, who proved the feasibility of radio communication. He sent and received his first radio signal in Italy in 1895. In 1899, he flashed the first wireless signal across the English Channel, and two years later received the letter "S," which was telegraphed from England to Newfoundland (now part of Canada). This was the first successful transatlantic radiotelegraph message.
In addition to Marconi, two of his contemporaries, Nikola Tesla and Nathan Stubblefield, took out patents for wireless radio transmitters. Nikola Tesla is now credited with being the first person to patent radio technology. The Supreme Court overturned Marconi's patent in 1943 in favor of Tesla's.
Radiotelegraphy is the sending by radio waves of the same dot-dash message (Morse code) used by telegraphs. Transmitters, at the turn of the century, were known as spark-gap machines. They were developed mainly for ship-to-shore and ship-to-ship communication. This form of radiotelegraphy allowed for simple communication between two points. However, it was not public radio broadcasting as we know it today.
The use of wireless signaling increased after it was proved to be effective in communication for rescue work at sea. Soon a number of ocean liners even installed wireless equipment. In 1899, the United States Army established wireless communications with a lightship off Fire Island, New York. Two years later, the Navy adopted a wireless system. Up until then, the Navy had been using visual signaling and homing pigeons for communication.
In 1901, radiotelegraph service was established between five Hawaiian Islands. In 1903, a Marconi station located in Wellfleet, Massachusetts, carried an exchange between President Theodore Roosevelt and King Edward VII. In 1905, the naval battle of Port Arthur in the Russo-Japanese war was reported by wireless. And in 1906, the U.S. Weather Bureau experimented with radiotelegraphy to speed up notice of weather conditions.
Robert E. Peary, an arctic explorer, radiotelegraphed "I found the Pole" in 1909. A year later, Marconi established regular American-European radiotelegraph service, which several months later enabled an escaped British murderer to be apprehended on the high seas. In 1912, the first transpacific radiotelegraph service was established, linking San Francisco with Hawaii.
Meanwhile, overseas radiotelegraph service developed slowly, primarily because the initial radiotelegraph transmitter was unstable and caused a high amount of interference. The Alexanderson high-frequency alternator and the De Forest tube eventually resolved many of these early technical problems.
Lee de Forest was the inventor of space telegraphy, the triode amplifier, and the Audion, an amplifying vacuum tube. In the early 1900s, the development of radio was hampered by the lack of an efficient detector of electromagnetic radiation. It was De Forest who provided that detector. His invention made it possible to amplify the radio frequency signal picked up by antennae. This allowed for the use of much weaker signals than had previously been possible. De Forest was also the first person to use the word "radio."
The result of Lee de Forest's work was the invention of amplitude-modulated or AM radio, which allowed for a multitude of radio stations. It was a huge improvement over the earlier spark-gap transmitters.
In 1915, speech was first transmitted by radio across the continent from New York City to San Francisco and across the Atlantic Ocean. Five years later, Westinghouse's KDKA-Pittsburgh broadcasted the Harding-Cox election returns and began a daily schedule of radio programs. In 1927, commercial radiotelephony service linking North America and Europe was opened. In 1935, the first telephone call was made around the world using a combination of wire and radio circuits.
Edwin Howard Armstrong invented frequency-modulated or FM radio in 1933. FM improved the audio signal of radio by controlling the noise static caused by electrical equipment and the earth's atmosphere. Until 1936, all American transatlantic telephone communication had to be routed through England. That year, a direct radiotelephone circuit was opened to Paris.
In 1965, the first Master FM Antenna system in the world, designed to allow individual FM stations to broadcast simultaneously from one source, was erected on the Empire State Building in New York City.
The next advancement in telecommunications was radio, the first wireless mode of communication. Radios send messages by radio waves instead of wires. German scientist Heinrich Hertz proved the existence of radio waves, which occur in nature.
In 1895, a young Italian named Gugliemo Marconi invented what he called “the wireless telegraph” while experimenting in his parents’ attic. He used radio waves to transmit Morse code and the instrument he used became known as the radio. In 1906, Marconi shared the Nobel Prize for physics with Ferdinand Braun, a German, in recognition of their contributions to the development of wireless telegraphy. Radio works by changing sounds or signals into radio waves, which travel through air, space, and solid objects, and the radio receiver changes them back into the sounds, words, and music we hear.
A radio broadcast is a one-way transmission, originating from a radio station. In the early 1920s, radio played an important role in people’s lives, and over 500 stations were broadcasting news, music, sports, drama, and variety shows. By the 1930s, most households in the U.S. and Europe had at least one radio. In the evening, the family gathered around a big “console” that was usually located in the living room, where they might spend hours listening to variety shows or comedies from favorites like Jack Benny or Edgar Bergen and Charlie McCarthy.
Everyone used their imagination to visualize all of the characters in their favorite shows. This was the beginning of the “Golden Age of Radio.” The Radio Corporation of America (RCA), parent company of the National Broadcasting Company (NBC), Columbia Broadcasting System (CBS) and the British Broadcasting Corporation (BBC) produced and commissioned shows like “The Lone Ranger”, “The Shadow”, “BBC Dramas”, “I Love a Mystery,” and there were even plenty of shows for children, such as “Let’s Pretend” and “Hop Harrigan.”