what is radio

Your UK TV and radio guide to what's on TV and on demand plus all the latest entertainment, soap, film and drama news and reviews from Radio Times. Satellite navigation uses radio to determine location, and radar uses it to find and track things. The airwaves are a resource shared by many users. Radio broadcasting means transmission of audio (sound) to radio receivers belonging to a public audience. The greater bandwidth available has motivated a continuing trend to exploit higher frequencies throughout radio's history. The entire pattern of a wave, before it repeats itself, is called a cycle. A machine that sends radio signals is called a transmitter, while a machine that "picks up" the signals is called a receiver or antenna. These were often plays or dramas. “Radio,” which starred Cuba Gooding Jr. as Mr. Kennedy and chronicled the friendship between him and Harold Jones, a T.L. Other radio stations are supported by local communities. In the very high frequency band, greater than 30 megahertz, the Earth's atmosphere has less of an effect on the range of signals, and line-of-sight propagation becomes the principle mode. High frequencies in the microwave band are used, since microwaves pass through the ionosphere without refraction, and at microwave frequencies the high gain antennas needed to focus the radio energy into a narrow beam pointed at the receiver are small and take up a minimum of space in a satellite. Analog audio is the earliest form of radio broadcast. 2 : of or relating to electric currents or phenomena (such as electromagnetic radiation) of frequencies between about … Low frequency radio waves can bend around hills by diffraction, although repeater stations are often used to improve the quality of the signals. When the beam strikes a target object, radio waves are reflected back to the receiver. The first practical radio communications systems, developed by Guglielmo Marconi in 1894–5, transmitted telegraph signals by radio waves, so radio communication was first called "wireless telegraphy". The waves can bounce between the ionosphere and the earth to reach receivers that are not in the line of sight because of the curvature of the Earth's surface. Radar sets mainly use high frequencies in the microwave bands, because these frequencies create strong reflections from objects the size of vehicles and can be focused into narrow beams with compact antennas. Definition of radio. AM radio frequency bands fall between 535 kilohertz to 1.7 megahertz, acc… From Simple English Wikipedia, the free encyclopedia, https://simple.wikipedia.org/w/index.php?title=Radio&oldid=7393938, Articles lacking sources from December 2009, Creative Commons Attribution/Share-Alike License. The radio waves carry the information to the receiver location. The radio acted to pacify and assuage the worries of a confused and scared public. (the word broadcasting originated with the agricultural term meaning roughly "scattering seeds widely". Different radio systems use different modulation methods: Many other types of modulation are also used. Definition of Radio communication: is the transmission of signals by modulation of electromagnetic waves with frequencies below those of visible light. The radio operator must hold a government license, such as the general radiotelephone operator license in the US, obtained by taking a test demonstrating adequate technical and legal knowledge of safe radio operation. Some apps (e.g. Communication with spacecraft involves the longest transmission distances of any radio links, up to billions of kilometers for interplanetary spacecraft. Radar is a radiolocation method used to locate and track aircraft, spacecraft, missiles, ships, vehicles, and also to map weather patterns and terrain. Get the latest music and trending news, from your favorite artists and bands. In radio communication systems, information is carried across space using radio waves. A radio receiver does not need to be directly in view of the transmitter to receive programme signals. Like waves on a pond, a radio wave is a series of repeating peaks and valleys. In recent years "wireless" has gained renewed popularity as a more general term for devices communicating using electromagnetic radiation, either radio waves or light, due to the rapid growth of short-range computer networking, e.g., wireless local area networks Wi-Fi, and Bluetooth, as well as cell phones, to distinguish these uses from traditional "radio" communication, such as broadcasting. Examples are BPC, DCF77, JJY, MSF, RTZ, TDF, WWV, and YVTO. Cell tower channel transmitter power is 50 W. Current generation phones, called smartphones, have many functions besides making telephone calls, and therefore have several other radio transmitters and receivers that connect them with other networks: usually a WiFi modem, a Bluetooth modem, and a GPS receiver. Radio signals can start engines moving so that gates open on their own from a distance. For example, a television (video) signal has a greater data rate than an audio signal. Since radio waves can pass beyond national borders, some totalitarian countries which practice censorship use jamming to prevent their citizens from listening to broadcasts from radio stations in other countries. The radio waves from many transmitters pass through the air simultaneously without interfering with each other because each transmitter's radio waves oscillate at a different rate, in other words, each transmitter has a different frequency, measured in kilohertz (kHz), megahertz (MHz) or gigahertz (GHz). Radio is a way to send electromagnetic signals over a long distance, to deliver information from one place to another. US Federal law prohibits the nonmilitary operation or sale of any type of jamming devices, including ones that interfere with GPS, cellular, Wi-Fi and police radars.[15]. Radio telescopes receive radio waves from the sky to study astronomical objects. Radio waves were first identified and studied by German physicist Heinrich Hertz in 1886. Many of these devices use the ISM bands, a series of frequency bands throughout the radio spectrum reserved for unlicensed use. The receiver uses tuned circuits to select the radio signal desired out of all the signals picked up by the antenna and reject the others. In some classes, such as radio and television broadcasting stations, the transmitter is given a unique identifier consisting of a string of letters and numbers called a call sign, which must be used in all transmissions. Later inventors learned to transmit voices, which led to broadcasting of news, music and entertainment. Although they can be operated without a license, like all radio equipment these devices generally must be type-approved before sale. The transmitter emits a narrow beam of radio waves which is swept around the surrounding space. The first use of radio- in conjunction with electromagnetic radiation appears to have been by French physicist Édouard Branly, who in 1890 developed the coherer detector, which he called in French a radio-conducteur. Radio waves are still used to send messages between people. Radio is very widely used in everyday life now, and it is becoming more widely used as new applications are being found all the time.

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