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Guglielmo Giovanni Maria Marconi, 1st Marquis of Marconi was an Italian inventor and electrical engineer, known for his creation of a practical radio wave–based wireless telegraph system. This led to Marconi being credited as the inventor of radio, and he shared the 1909 Nobel Prize in Physics with Karl Ferdinand Braun "in recognition of their contributions to the development of wireless telegraphy".
The early history of radio is the history of technology that produces and uses radio instruments that use radio waves. Within the timeline of radio, many people contributed theory and inventions in what became radio. Radio development began as "wireless telegraphy". Later radio history increasingly involves matters of broadcasting.
Radio broadcasting is the broadcasting of audio (sound), sometimes with related metadata, by radio waves to radio receivers belonging to a public audience. In terrestrial radio broadcasting the radio waves are broadcast by a land-based radio station, while in satellite radio the radio waves are broadcast by a satellite in Earth orbit. To receive the content the listener must have a broadcast radio receiver (radio). Stations are often affiliated with a radio network that provides content in a common radio format, either in broadcast syndication or simulcast, or both. Radio stations broadcast with several different types of modulation: AM radio stations transmit in AM, FM radio stations transmit in FM, which are older analog audio standards, while newer digital radio stations transmit in several digital audio standards: DAB, HD radio, DRM. Television broadcasting is a separate service that also uses radio frequencies to broadcast television (video) signals.
Lee de Forest was an American inventor and a fundamentally important early pioneer in electronics. He invented the first practical electronic amplifier, the three-element "Audion" triode vacuum tube in 1906. This helped start the Electronic Age, and enabled the development of the electronic oscillator. These made radio broadcasting and long distance telephone lines possible, and led to the development of talking motion pictures, among countless other applications.
In radio communications, a radio receiver, also known as a receiver, a wireless, or simply a radio, is an electronic device that receives radio waves and converts the information carried by them to a usable form. It is used with an antenna. The antenna intercepts radio waves and converts them to tiny alternating currents which are applied to the receiver, and the receiver extracts the desired information. The receiver uses electronic filters to separate the desired radio frequency signal from all the other signals picked up by the antenna, an electronic amplifier to increase the power of the signal for further processing, and finally recovers the desired information through demodulation.
A spark-gap transmitter is an obsolete type of radio transmitter which generates radio waves by means of an electric spark. Spark-gap transmitters were the first type of radio transmitter, and were the main type used during the wireless telegraphy or "spark" era, the first three decades of radio, from 1887 to the end of World War I. German physicist Heinrich Hertz built the first experimental spark-gap transmitters in 1887, with which he proved the existence of radio waves and studied their properties.
The Marconi Company was a British telecommunications and engineering company that did business under that name from 1963 to 1987. Its roots were in the Wireless Telegraph & Signal Company founded by Italian inventor Guglielmo Marconi in 1897, which underwent several changes in name after mergers and acquisitions. The company was a pioneer of wireless long distance communication and mass media broadcasting, eventually becoming one of the UK's most successful manufacturing companies. In 1999, its defence equipment manufacturing division, Marconi Electronic Systems, merged with British Aerospace (BAe) to form BAE Systems. In 2006, financial difficulties led to the collapse of the remaining company, with the bulk of the business acquired by the Swedish telecommunications company, Ericsson.
KRTH is a commercial radio station that is licensed to Los Angeles, California, United States and serves the Greater Los Angeles area. The station is owned by Audacy, Inc. and broadcasts a classic hits format. KRTH's studios are located on Wilshire Boulevard in the Miracle Mile district of Los Angeles. The station's signal covers an extremely large area of Southern California due in part to its antenna location on Mt. Wilson. It can be heard as far south as San Diego, as far east as Moreno Valley, as far west as Santa Barbara, and as far north as Barstow. KRTH is the flagship station for the nationally syndicated program Rewind with Gary Bryan.
KIIS-FM is a commercial radio station licensed to Los Angeles, California, United States, and broadcasts to the Greater Los Angeles area. The station airs a Top 40 (CHR) format. Owned by iHeartMedia, KIIS-FM is the origin of the conglomerate's KISS-FM brand, and serves as the flagship station for the radio program On Air with Ryan Seacrest. KIIS-FM's studios are located in Burbank, while the station transmitter resides on Mount Wilson, north of Los Angeles.
The invention of radio communication was preceded by many decades of establishing theoretical underpinnings, discovery and experimental investigation of radio waves, and engineering and technical developments related to their transmission and detection. These developments allowed Guglielmo Marconi to turn radio waves into a wireless communication system.
WILM is a news/talk AM radio station broadcasting in Wilmington, Delaware, United States. The station is owned by iHeartMedia. WILM is known as the station where radio and television talk show Joe Pyne developed the confrontational style now standard in radio and TV talk shows. Another well-known WILM personality was Tom Mees (ESPN) who worked at the station in the 1970s.
The timeline of radio lists within the history of radio, the technology and events that produced instruments that use radio waves and activities that people undertook. Later, the history is dominated by programming and contents, which is closer to general history.
KLAA is a commercial AM radio station licensed to the city of Orange, California, and broadcasting to the Greater Los Angeles Area. The station is owned by LAA 1, LLC, composed of the owners and executives of the Los Angeles Angels baseball team, and is held separately from the baseball club. KLAA's studios and offices are located on the grounds of Angel Stadium of Anaheim in Anaheim, California. The transmitter is in Chino, California, off McCarty Road.
The Fleming valve, also called the Fleming oscillation valve, was a thermionic valve or vacuum tube invented in 1904 by English physicist John Ambrose Fleming as a detector for early radio receivers used in electromagnetic wireless telegraphy. It was the first practical vacuum tube and the first thermionic diode, a vacuum tube whose purpose is to conduct current in one direction and block current flowing in the opposite direction. The thermionic diode was later widely used as a rectifier — a device that converts alternating current (AC) into direct current (DC) — in the power supplies of a wide range of electronic devices, until beginning to be replaced by the selenium rectifier in the early 1930s and almost completely replaced by the semiconductor diode in the 1960s. The Fleming valve was the forerunner of all vacuum tubes, which dominated electronics for 50 years. The IEEE has described it as "one of the most important developments in the history of electronics", and it is on the List of IEEE Milestones for electrical engineering.
The year 1963 saw a number of significant happenings in radio broadcasting history.
The year 1975 saw a number of significant events in radio broadcasting history.
The year 1989 saw a number of significant events in radio broadcasting.
Pegeen Fitzgerald was an American radio personality perhaps best known for co-hosting The Fitzgeralds on radio in New York City.
The Marconi Wireless Telegraph Company of America was incorporated in 1899. It was established as a subsidiary of the British Marconi Company and held the U.S. and Cuban rights to Guglielmo Marconi's radio patents. American Marconi initially primarily operated high-powered land and transatlantic shipboard stations. In 1912, it acquired the extensive assets of the bankrupt United Wireless Telegraph Company, becoming the dominant radio communications provider in the United States.
Lester Mandiville Mitchel was an American film actor and radio producer, director and actor, known for directing Stars over Hollywood and Backstage Wife, as well as hosting, producing and directing Skippy Hollywood Theatre.
References
- ↑ "Radio in History". On This Day. Retrieved 2019-10-22.
- ↑ U.S. patent 760,463 .
- ↑ U.S. patent 803,684 .
- ↑ "Radio/Broadcasting Timeline". CBN History. WCBN. Archived from the original on 2022-03-01. Retrieved 2019-10-22.[ additional citation(s) needed ]
- ↑ Armstrong, Alice Catt (1950). Who's Who in Los Angeles County . Los Angeles, CA: Who's Who Historical Society. p. 145. ISSN 0508-6930.
- ↑ "Obituaries: Les Mitchel". Variety. January 22, 1975. p. 94. ProQuest 1401273197.
- ↑ Flint, Peter B. (January 31, 1989). "Pegeen Fitzgerald, 78, Radio Host Of Family-Style Talk Show, Dies". The New York Times. Retrieved 11 April 2016.
- ↑ "Pegeen Fitzgerald". Radio Television Mirror. 35 (4): 80. March 1951. Retrieved 9 April 2016.
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