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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.
In radio communication, a transceiver is an electronic device which is a combination of a radio transmitter and a receiver, hence the name. It can both transmit and receive radio waves using an antenna, for communication purposes. These two related functions are often combined in a single device to reduce manufacturing costs. The term is also used for other devices which can both transmit and receive through a communications channel, such as optical transceivers which transmit and receive light in optical fiber systems, and bus transceivers which transmit and receive digital data in computer data buses.
AM broadcasting is radio broadcasting using amplitude modulation (AM) transmissions. It was the first method developed for making audio radio transmissions, and is still used worldwide, primarily for medium wave transmissions, but also on the longwave and shortwave radio bands.
Broadcasting is the distribution of audio or video content to a dispersed audience via any electronic mass communications medium, but typically one using the electromagnetic spectrum, in a one-to-many model. Broadcasting began with AM radio, which came into popular use around 1920 with the spread of vacuum tube radio transmitters and receivers. Before this, most implementations of electronic communication were one-to-one, with the message intended for a single recipient. The term broadcasting evolved from its use as the agricultural method of sowing seeds in a field by casting them broadly about. It was later adopted for describing the widespread distribution of information by printed materials or by telegraph. Examples applying it to "one-to-many" radio transmissions of an individual station to multiple listeners appeared as early as 1898.
Wireless communication is the transfer of information (telecommunication) between two or more points without the use of an electrical conductor, optical fiber or other continuous guided medium for the transfer. The most common wireless technologies use radio waves. With radio waves, intended distances can be short, such as a few meters for Bluetooth or as far as millions of kilometers for deep-space radio communications. It encompasses various types of fixed, mobile, and portable applications, including two-way radios, cellular telephones, personal digital assistants (PDAs), and wireless networking. Other examples of applications of radio wireless technology include GPS units, garage door openers, wireless computer mouse, keyboards and headsets, headphones, radio receivers, satellite television, broadcast television and cordless telephones. Somewhat less common methods of achieving wireless communications involve other electromagnetic phenomena, such as light and magnetic or electric fields, or the use of sound.
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 started 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.
Telefunken was a German radio and television apparatus company, founded in Berlin in 1903, as a joint venture of Siemens & Halske and the Allgemeine Elektrizitäts-Gesellschaft (AEG).
West Virginia Public Broadcasting (WVPB) is the public television and radio state network serving the U.S. state of West Virginia. It is owned by the West Virginia Public Broadcasting Authority, an agency of the state government that holds the licenses for all Public Broadcasting Service (PBS) and National Public Radio (NPR) member stations licensed in West Virginia. It is headquartered in Charleston with studios in Morgantown and Beckley.
The Voice of America's Bethany Relay Station was located in Butler County, Ohio's Union Township about 25 miles (40 km) north of Cincinnati, adjacent to the transmitter site of WLW. Starting in 1944 during World War II it transmitted American radio programming abroad on shortwave frequencies, using 200,000-watt transmitters built by Crosley engineers under the direction of R.J. Rockwell. The site was developed to provide 'fallback' transmission facilities inland and away from the East Coast, where transmitters were located in Massachusetts, on Long Island in New York, and in New Jersey, all close to the ocean, subject to attack from German submarines or other invading forces.
WOUB-TV is a PBS member television station in Athens, Ohio, United States. The station's transmitter is located west of the city off SR 56. Its programming can also be seen on satellite station WOUC-TV in Cambridge, with transmitter near Fairview, Ohio.
WDGG is a country music–formatted radio station licensed to Ashland, Kentucky, United States, serving Huntington, West Virginia, and the greater Huntington–Ashland metropolitan area. The station is owned by Kindred Communications as part of a conglomerate with Huntington–licensed ESPN Radio–affiliated sports station WRVC, Huntington–licensed ESPN Radio–affiliated sports station WCMI, Catlettsburg, Kentucky–licensed active rock station WCMI-FM, Kenova, West Virginia–licensed adult contemporary station WMGA, and Gallipolis, Ohio–licensed classic country station WXBW. All six stations share studios on Fifth Avenue in downtown Huntington, while its transmitter facilities off of Park Avenue near I-64 in southwestern Huntington.
WCMI (1340 AM is an ESPN Radio–affiliated radio station licensed to Ashland, Kentucky, United States, and serving Huntington, West Virginia and the greater Huntington–Ashland metropolitan area. The station is owned by Huntington–based Kindred Communications as part of a conglomerate with Huntington–licensed ESPN Radio–affiliated sports station WRVC, Catlettsburg, Kentucky–licensed active rock station WCMI-FM, Ashland–licensed country music station WDGG, Kenova, West Virginia–licensed adult contemporary station WMGA, and Gallipolis, Ohio–licensed classic country station WXBW. All six stations share studios on Fifth Avenue in downtown Huntington, while its transmitter facilities off of US 52 across the Ohio River from Ashland in Perry Township, Lawrence County, Ohio.
WRVC is an ESPN Radio–affiliated sports–formatted radio station licensed to Huntington, West Virginia, United States, and serving the greater Huntington–Ashland metropolitan area. The station is owned by Huntington–based Kindred Communications as part of a conglomerate with Ashland, Kentucky–licensed ESPN Radio–affiliated sports station WCMI, Catlettsburg, Kentucky–licensed active rock station WCMI-FM, Ashland–licensed country music station WDGG, Kenova, West Virginia–licensed adult contemporary station WMGA, and Gallipolis, Ohio–licensed classic country station WXBW. All six stations share studios on Fifth Avenue in downtown Huntington, while its transmitter facilities off of Park Avenue near I-64 in southwestern Huntington.
The National Electronics Museum, located in Linthicum, Maryland, displays the history of the United States defense electronics. The museum houses exhibits containing assortments of telegraphs, radios, radars and satellites. Located near the Baltimore/Washington International Airport and rail station, the museum displays hands-on electronics. The library serves as a research center open to the public. In addition, an amateur radio station is broadcast live from the museum each week. K3NEM/W3GR includes both antique and updated communication equipment.
Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frequency between 3 hertz (Hz) and 3,000 gigahertz (GHz). They are generated by an electronic device called a transmitter connected to an antenna which radiates the waves, and received by another antenna connected to a radio receiver. Radio is widely used in modern technology, in radio communication, radar, radio navigation, remote control, remote sensing, and other applications.
The following timeline tables list the discoveries and inventions in the history of electrical and electronic engineering.
This article details the history of electronics engineering. Chambers Twentieth Century Dictionary (1972) defines electronics as "The science and technology of the conduction of electricity in a vacuum, a gas, or a semiconductor, and devices based thereon".
Wireless Hill Park is a 40-hectare (99-acre) park in Ardross, Western Australia that is the location of the former Applecross Wireless Station, an early radio station in Western Australia. The station buildings have been preserved and now house the Wireless Hill Museum. The site is listed in the Register of the National Estate. and the State Register of Heritage Places.
The California Historical Radio Society ("CHRS') is a non-profit organization centered on the history of radio and radio broadcasting, including related technologies such as vintage TV, amateur radio and HiFi. The focus is on the history of early radio and early radio broadcasting in California, especially the San Francisco Bay Area and the western states. Its museum and headquarters, known as "Radio Central," are located on its new site in Alameda, California.