Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave. In amplitude modulation, the amplitude of the wave is varied in proportion to that of the message signal, such as an audio signal. This technique contrasts with angle modulation, in which either the frequency of the carrier wave is varied, as in frequency modulation, or its phase, as in phase modulation.
In electronics and telecommunications, a radio transmitter or just transmitter is an electronic device which produces radio waves with an antenna with the purpose of signal transmission up to a radio receiver. The transmitter itself generates a radio frequency alternating current, which is applied to the antenna. When excited by this alternating current, the antenna radiates radio waves.
In electronics, a remote control is an electronic device used to operate another device from a distance, usually wirelessly. In consumer electronics, a remote control can be used to operate devices such as a television set, DVD player or other digital home media appliance. A remote control can allow operation of devices that are out of convenient reach for direct operation of controls. They function best when used from a short distance. This is primarily a convenience feature for the user. In some cases, remote controls allow a person to operate a device that they otherwise would not be able to reach, as when a garage door opener is triggered from outside.
Radio control is the use of control signals transmitted by radio to remotely operate a device. Examples of simple radio control systems are garage door openers and keyless entry systems for vehicles, in which a small handheld radio transmitter unlocks or opens doors. Radio control is also used for control of model vehicles from a hand-held radio transmitter. Industrial, military, and scientific research organizations make use of radio-controlled vehicles as well. A rapidly growing application is control of unmanned aerial vehicles for both civilian and military uses, although these have more sophisticated control systems than traditional applications.
Radio Netherlands was a public radio and television network based in Hilversum, producing and transmitting programmes for international audiences outside the Netherlands from 1947 to 2012.
The Crystal Palace transmitting station, officially known as Arqiva Crystal Palace, is a broadcasting and telecommunications site in the Crystal Palace area of the London Borough of Bromley, England. It is located on the site of the former television station and transmitter operated by John Logie Baird from 1933.
Japan Remote Control Co., Ltd. was a Japanese manufacturer of popular radio control devices including transmitters, receivers, servos, electronics, programmable robots and model aircraft. JR has ceased production of RC equipment.
Grimeton Radio Station in southern Sweden, close to Varberg in Halland, is an early longwave transatlantic wireless telegraphy station built in 1922–1924, that has been preserved as a historical site. From the 1920s through the 1940s it was used to transmit telegram traffic by Morse code to North America and other countries, and during World War II was Sweden's only telecommunication link with the rest of the world. It is the only remaining example of an early pre-electronic radio transmitter technology called an Alexanderson alternator. It was added to the UNESCO World Heritage List in 2004, with the statement: "Grimeton Radio Station, Varberg is an exceptionally well preserved example of a type of telecommunication centre, representing the technological achievements by the early 1920s, as well as documenting the further development over some three decades." The radio station is also an anchor site for the European Route of Industrial Heritage. The transmitter is still in operational condition, and each year on a day called Alexanderson Day is started up and transmits brief Morse code test transmissions, which can be received all over Europe.
The Orfordness transmitting station was a major radio broadcasting facility at Orford Ness on the Suffolk coast in the United Kingdom able to broadcast to much of Europe. It closed in May 2012 after more than 30 years of service. In 2017 Radio Caroline started broadcasting from the site, though not with the same intended coverage of an audience in Europe as the original station.
Amateur radio direction finding is an amateur racing sport that combines radio direction finding with the map and compass skills of orienteering. It is a timed race in which individual competitors use a topographic map, a magnetic compass and radio direction finding apparatus to navigate through diverse wooded terrain while searching for radio transmitters. The rules of the sport and international competitions are organized by the International Amateur Radio Union. The sport has been most popular in Eastern Europe, Russia, and China, where it was often used in the physical education programs in schools.
CFMZ-FM is an FM radio station that is licensed to Toronto, Ontario, Canada. Broadcasting on 96.3 MHz, the station is owned by ZoomerMedia and airs a classical music radio format. CFMZ's studios are located on Jefferson Avenue in Liberty Village, while its transmitter is located atop First Canadian Place in downtown Toronto.
Buddy box or buddy boxing is a colloquialism referring to two R/C aircraft radio systems joined together for pilot training purposes.
Masami Hirosaka is a Japanese radio controlled car driver who is considered to be the world's most successful with a record fourteen IFMAR World Championships in 1/12 scale electric, 1/10 scale Pan, 1/10 scale 2WD off-road and 1/10 scale 4WD, all electric. Hirosaka's peers have nicknamed him "Master Masami". He was considered to be one of the highest paid drivers in RC racing, until he retired from the activity. His last IFMAR race was the 2008 world championship in Thailand. His retirement ceremony was on May 3, 2009.
Multiplex Modellsport GmbH & Co. KG of Bretten-Gölshausen, Germany is a manufacturer of hobby-grade radio control electronics, electric radio-controlled airplanes and electric helicopters.
WQQK is an urban adult contemporary radio station broadcasting in the Nashville, Tennessee. Its transmitter site is in Goodlettsville, Tennessee, and its studios are located in Nashville's Music Row district.
WVTF is a non-commercial educational radio station licensed to serve Roanoke, Virginia, featuring a public radio format branded "Radio IQ". Owned by Virginia Polytechnic Institute and State University through its fundraising arm, the Virginia Tech Foundation, the station carries programming from NPR, the Public Radio Exchange, American Public Media and the BBC World Service. WVTF is a listener-supported station, holding periodic fundraisers on the air. The studios and offices are on Kingsbury Lane in Roanoke.
Radio is the technology of communicating using radio waves. Radio waves are electromagnetic waves of frequency between 3 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmitter connected to an antenna which radiates oscillating electrical energy, often characterized as a wave. They can be received by other antennas connected to a radio receiver, this is the fundamental principle of radio communication. In addition to communication, radio is used for radar, radio navigation, remote control, remote sensing, and other applications.
WMLK is a shortwave radio station in Bethel, Pennsylvania owned by the Assemblies of Yahweh. WMLK derives its callsign from MLK, representing the consonants of the Hebrew word "malak" meaning a "messenger" or angel. A different vocalisation of the word will also yield the definition salt.
Sanwa Denshi, widely known as Sanwa, is a brand of wireless equipment best known for its high end radio-control gear for scale modelling use. The company have been a subsidiary of the SMC Group since 1965 and began to diversify into the manufacturing of radio-control equipment in 1974 and remote control devices for home and industrial use since 1985.
The 2005 IFMAR 1:10 Electric Off-Road World Championships was the tenth edition of the IFMAR 1:10 Electric Off-Road World Championship was held on August 6–13, 2005.
