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Nikola Tesla
A serbain American inventor who discovered the basis for most alternating current machinery. In 1884, a year after coming to the United States he sold the patent rights for his system of alternating current dynamos , transformers, and motors to George Westinghouse. He the estblished his own lab where he invented, among other things, the Telsa coil, and induction coil widely used in radio. -
Heinrich Rodolf Hertz
In 1888 Heinrich Rodolf Hertz was able to conclusively prove transmitted airborn electromagnetic waves in an experiment confirming Maxwell's theory of eletromagnetism. Electromanetism is a electromagnetic force and it is one of the four fundamental interactions in nature. -
Natan B. Stubblefield
The first time human voice was transmitted by radio is debateable. Claims to that distinction range from the phase, "Hello Rainey" spoken by Natan B. Stubblefield to a test partner near Murray, Kentucky, in 1892. -
Edwin Armstrorng
This WWI Army officer, Columbia University engineering professer, and creator of FM radio invented htregenerative circuit , the first amplifying receiver and reliable continous-wave transmitter; and the superheterodyne circuit, a means of receiving, converting and amlifying weak, high-frequeany elecrtomagnetic waves. His inventions are considered by many to provide the foundation for cellular phones. -
Reinald Fessenden
This Canadian spent much of his working life in the U.S. where he developed a way to combine sound and radio carrier waves. His first effort to transmit this mixed signal- to a receiver where the carrier wave wiuld be removed and the listener could hear the original sound - failed. However, in 1906, using Alexanderson's Alternator, Fessenden made the first long-range transmission of voice from Brant Rock, MA -
Bi-Plane
Frederick Baldwin and John McCurdy were the first to trail an aerial behind their bi-plane to demonstrate radio's uses for aviation. -
Lee DeForest
Credited with being the "Father of American Radio." Deforest was a direct competitor to Marconi at the turn of the century (1899), when he was the chief scientist at the U.S.'s first radio firm-- American Wireless Telephone and Telegraph-- until Marconi took over the company's assest in 1912 after a series of financial scandals. Although he held 300 patents, Deforest's greatests technological contriution is considered to be his 1906 "Audion" vacuun tube. -
Police Vechicals
Detroit police commissioner William Rutledge was the first public saftey offical to use radioequipped vehicles. -
Guglielmo Marconi
This Italian creator spent most of his working life in England where he introduced mant of the first uses of wireess telegraphy to European navies. His radio apparatus is the widely considered to be the reason tha over 700 people survived the titanic disaster in 1912-- instead of dying as they would have if ships at sea were still using carrier pigeons to communicate over great distances. -
Radio Comunication
The first ship to shore two way radio conversation occurred in 1922, between Deal beach, New Jersey, abd the S.S. America, 400 miles at sea. However, it was not until 1929 that the high seas public radiotelephone service was inaugurated. At the time telephone contact could be made only with ships within 1,500 miles of the shore. Today there is the ability to telephone nearly every large ship wherever it may be on the globe. -
Edwin Howard Armstrong
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 translantic teltphone communication had to be routed through England. In that year, a direct radiotelephone circuit was opened to Paris. Telephone connection by radio and cable is now accessible with 187 foreign points. -
1941
30 commerical Fm stations are now on air. -
2021
by the end or the year, there are 2021 radio stations ont the air. -
Ernst Alexanderson
Born in sweden, this remarkable inventor developed the first alternator to make transmission of speech (as opposed to the dots and dashes of telegraphs) posible. It is said that this holder of 334 patents "virtually invented eberything General Electric did in the field of AM, FM and TV." -
Music Radio
Music radio is a radio format in which tmusic is the main broadcast content.
