219 relations: Action at a distance, Airband, Alexander Graham Bell, Alexander Stepanovich Popov, Alternating current, AM broadcasting, Amateur radio, Amateur radio satellite, Amplifier, Amplitude, Amplitude modulation, Anamorphic widescreen, Angle modulation, Antenna (radio), Archie Frederick Collins, Atom, ATSC standards, Édouard Branly, Background radiation, Bandwidth (signal processing), Battle of Tsushima, BBC, Bluetooth, Capture effect, Carrier wave, Cell site, Charlie Brown, Citizens band radio, Classical compound, Clear-channel station, Code-division multiple access, Coherer, Communications system, Continuous wave, Crane (machine), David Edward Hughes, David Sarnoff, Demodulation, Detector (radio), Dielectric heating, Diffraction, Digital audio broadcasting, Digital container format, Digital Radio Mondiale, Digital signal processing, Digital television, Distance measuring equipment, Doppler effect, Duplex (telecommunications), DVB-T, ..., Earth, Edwin J. Houston, Electric current, Electrical conductor, Electrical resonance, Electromagnetic induction, Electromagnetic interference, Electromagnetic radiation, Electromagnetic spectrum, Electromagnetism, Electron, Electronic filter, Electronic oscillator, Electronics, Electrostatic induction, Elihu Thomson, Etheric force, Extremely high frequency, Fading, Family Radio Service, FM broadcasting, Fourteen Points, Frequency, Frequency allocation, Frequency modulation, Frequency-division multiplexing, Frequency-shift keying, Gamma ray, George Adams (1750-1795), Ghosting (television), Global Positioning System, Grand Rapids, Michigan, GSM, Guglielmo Marconi, H.264/MPEG-4 AVC, Heinrich Hertz, Hertz, Heterodyne, High fidelity, High frequency, High-definition television, Hobby, Horizon, IHeartMedia, Infrared, Inverse-square law, Ionosphere, Jagadish Chandra Bose, James Clerk Maxwell, Joseph Henry, KTNN, LC circuit, Lee de Forest, Light, List of 50 kW AM radio stations in the United States, Locomotive, LORAN, Loudspeaker, LowFER, Luigi Galvani, Madison Square Garden, Marine VHF radio, Medium wave, Microphone, Microwave, Microwave oven, Military communications, Missile, Mobile telephony, Modulation, Morse code, MPEG transport stream, MPEG-1 Audio Layer II, MPEG-2, Multi-Use Radio Service, Nikola Tesla, Noise (electronics), Non-ionizing radiation, NTSC, Oliver Lodge, On-off keying, Optics, Orthogonal frequency-division multiplexing, Outline of radio, Phase (waves), Phase modulation, Photon, Photophone, Pioneer program, Pirate radio, Polarization (waves), Position fixing, Positioning (marketing), Power-line communication, Public switched telephone network, Pulse-width modulation, Quadrature amplitude modulation, Radar, Radiant, Radiation therapy, Radio broadcasting, Radio control, Radio direction finder, Radio frequency, Radio jamming, Radio programming, Radio quiet zone, Radio receiver, Radio spectrum, Radio Times, Radio wave, Radio-controlled car, Radio-frequency engineering, Radioactive decay, Radiotelephone, Radioteletype, RCA, Reed–Solomon error correction, Reflection (physics), Refraction, Resonance, RMS Titanic, San Jose, California, Satellite navigation, Satellite phone, Satellite radio, Shortwave radio, Signal-to-noise ratio, Single-sideband modulation, Sirius Satellite Radio, Sound, Spark-gap transmitter, Speech, Spread spectrum, Subsidiary communications authority, Tactical air navigation system, Technical standard, Telecommunication, Telegraphy, Terminal equipment, Terrestrial Trunked Radio, Thomas Edison, Time of flight, Time-division multiplexing, Transistor, Transmission (telecommunications), Transmitter, Tuner (radio), TV and FM DX, Ultraviolet, UMTS, User requirements document, Vacuum tube, Very high frequency, VHF omnidirectional range, VORTAC, Walkie-talkie, WBCT, Wi-Fi, Wireless LAN, Wireless network, Wireless telegraphy, Woodrow Wilson, World War I, World War II, X-ray, XM Satellite Radio, 1worldspace, 8VSB. Expand index (169 more) » « Shrink index
In physics, action at a distance is the concept that an object can be moved, changed, or otherwise affected without being physically touched (as in mechanical contact) by another object.
Airband or aircraft band is the name for a group of frequencies in the VHF radio spectrum allocated to radio communication in civil aviation, sometimes also referred to as VHF, or phonetically as "Victor".
Alexander Graham Bell (March 3, 1847 – August 2, 1922) was a Scottish-born scientist, inventor, engineer, and innovator who is credited with inventing and patenting the first practical telephone.
Alexander Stepanovich Popov (sometimes spelled Popoff; Алекса́ндр Степа́нович Попо́в; –) was a Russian physicist who is acclaimed in his homeland and some eastern European countries as the inventor of radio.
Alternating current (AC) is an electric current which periodically reverses direction, in contrast to direct current (DC) which flows only in one direction.
AM broadcasting is a radio broadcasting technology, which employs amplitude modulation (AM) transmissions.
Amateur radio, also known as ham radio, describes the use of radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emergency communication.
An amateur radio satellite is an artificial satellite built and used by amateur radio operators for use in the Amateur-satellite service.
An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the power of a signal (a time-varying voltage or current).
The amplitude of a periodic variable is a measure of its change over a single period (such as time or spatial period).
Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting information via a radio carrier wave.
Anamorphic widescreen (also called Full height anamorphic) is a process by which a comparatively wide widescreen image is horizontally compressed to fit into a storage medium (photographic film or MPEG-2 Standard Definition frame, for example) with a narrower aspect ratio, reducing the horizontal resolution of the image while keeping its full original vertical resolution.
Angle modulation is a class of carrier modulation that is used in telecommunications transmission systems.
In radio, an antenna is the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver.
Archie Frederick Collins (January 8, 1869 – January 3, 1952), who generally went by A. Frederick Collins, was a prominent early American experimenter in wireless telephony and prolific author of books and articles covering a wide range of scientific and technical subjects.
An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element.
Advanced Television Systems Committee (ATSC) standards are a set of standards for digital television transmission over terrestrial, cable, and satellite networks.
Édouard Eugène Désiré Branly (23 October 1844 – 24 March 1940) was a French inventor, physicist and professor at the Institut Catholique de Paris.
Background radiation is a measure of the ionizing radiation present in the environment at a particular location which is not due to deliberate introduction of radiation sources.
Bandwidth is the difference between the upper and lower frequencies in a continuous band of frequencies.
The Battle of Tsushima (Цусимское сражение, Tsusimskoye srazheniye), also known as the Battle of Tsushima Strait and the Naval Battle of the Sea of Japan (Japanese: 日本海海戦, Nihonkai-Kaisen) in Japan, was a major naval battle fought between Russia and Japan during the Russo-Japanese War.
The British Broadcasting Corporation (BBC) is a British public service broadcaster.
Bluetooth is a wireless technology standard for exchanging data over short distances (using short-wavelength UHF radio waves in the ISM band from 2.4 to 2.485GHz) from fixed and mobile devices, and building personal area networks (PANs).
In telecommunications, the capture effect, or FM capture effect, is a phenomenon associated with FM reception in which only the stronger of two signals at, or near, the same frequency or channel will be demodulated.
In telecommunications, a carrier wave, carrier signal, or just carrier, is a waveform (usually sinusoidal) that is modulated (modified) with an input signal for the purpose of conveying information.
A cell site or cell tower is a cellular-enabled mobile device site where antennae and electronic communications equipment are placed — typically on a radio mast, tower, or other raised structure — to create a cell (or adjacent cells) in a cellular network.
Charlie Brown is the central protagonist of the comic strip Peanuts, syndicated in daily and Sunday newspapers in numerous countries all over the world.
Citizens band radio (also known as CB radio) is, in many countries, a system of short-distance radio communications between individuals typically on a selection of 40 channels within the 27 MHz (11 m) band.
Classical compounds and neoclassical compounds are compound words composed from combining forms (which act as affixes or stems) derived from classical Latin or ancient Greek roots.
A clear-channel station is an AM radio station in North America that has the highest protection from interference from other stations, particularly concerning night-time skywave propagation.
Code-division multiple access (CDMA) is a channel access method used by various radio communication technologies.
The coherer was a primitive form of radio signal detector used in the first radio receivers during the wireless telegraphy era at the beginning of the 20th century.
In telecommunication, a communications system is a collection of individual communications networks, transmission systems, relay stations, tributary stations, and data terminal equipment (DTE) usually capable of interconnection and interoperation to form an integrated whole.
A continuous wave or continuous waveform (CW) is an electromagnetic wave of constant amplitude and frequency, almost always a sine wave, that for mathematical analysis is considered to be of infinite duration.
A crane is a type of machine, generally equipped with a hoist rope, wire ropes or chains, and sheaves, that can be used both to lift and lower materials and to move them horizontally.
David Edward Hughes (16 May 1831 – 22 January 1900), was a British-American inventor, practical experimenter, and professor of music known for his work on the printing telegraph and the microphone.
David Sarnoff (Даві́д Сарно́ў, Дави́д Сарно́в, February 27, 1891 – December 12, 1971) was an American businessman and pioneer of American radio and television.
Demodulation is extracting the original information-bearing signal from a carrier wave.
In radio, a detector is a device or circuit that extracts information from a modulated radio frequency current or voltage.
Dielectric heating, also known as electronic heating, RF (radio frequency) heating, and high-frequency heating, is the process in which a radio frequency alternating electric field, or radio wave or microwave electromagnetic radiation heats a dielectric material.
--> Diffraction refers to various phenomena that occur when a wave encounters an obstacle or a slit.
Digital audio broadcasting (DAB) is a digital radio standard for broadcasting digital audio radio services, used in many countries across Europe, Asia, and the Pacific.
A container or wrapper format is a metafile format whose specification describes how different elements of data and metadata coexist in a computer file.
Digital Radio Mondiale (DRM; mondiale being Italian and French for "worldwide") is a set of digital audio broadcasting technologies designed to work over the bands currently used for analogue radio broadcasting including AM broadcasting, particularly shortwave, and FM broadcasting.
Digital signal processing (DSP) is the use of digital processing, such as by computers or more specialized digital signal processors, to perform a wide variety of signal processing operations.
Digital television (DTV) is the transmission of television signals, including the sound channel, using digital encoding, in contrast to the earlier television technology, analog television, in which the video and audio are carried by analog signals.
Distance measuring equipment (DME) is a transponder-based radio navigation technology that measures slant range distance by timing the propagation delay of VHF or UHF radio signals.
The Doppler effect (or the Doppler shift) is the change in frequency or wavelength of a wave in relation to observer who is moving relative to the wave source.
A duplex communication system is a point-to-point system composed of two or more connected parties or devices that can communicate with one another in both directions.
DVB-T is an abbreviation for "Digital Video Broadcasting — Terrestrial"; it is the DVB European-based consortium standard for the broadcast transmission of digital terrestrial television that was first published in 1997 and first broadcast in the UK in 1998.
Earth is the third planet from the Sun and the only astronomical object known to harbor life.
Edwin J. Houston (July 9, 1847 – March 1, 1914) was an American businessman, professor, consulting electrical engineer, inventor and author.
An electric current is a flow of electric charge.
In physics and electrical engineering, a conductor is an object or type of material that allows the flow of an electrical current in one or more directions.
Electrical resonance occurs in an electric circuit at a particular resonant frequency when the imaginary parts of impedances or admittances of circuit elements cancel each other.
Electromagnetic or magnetic induction is the production of an electromotive force (i.e., voltage) across an electrical conductor in a changing magnetic field.
Electromagnetic interference (EMI), also called radio-frequency interference (RFI) when in the radio frequency spectrum, is a disturbance generated by an external source that affects an electrical circuit by electromagnetic induction, electrostatic coupling, or conduction.
In physics, electromagnetic radiation (EM radiation or EMR) refers to the waves (or their quanta, photons) of the electromagnetic field, propagating (radiating) through space-time, carrying electromagnetic radiant energy.
The electromagnetic spectrum is the range of frequencies (the spectrum) of electromagnetic radiation and their respective wavelengths and photon energies.
Electromagnetism is a branch of physics involving the study of the electromagnetic force, a type of physical interaction that occurs between electrically charged particles.
The electron is a subatomic particle, symbol or, whose electric charge is negative one elementary charge.
Electronic filters are circuits which perform signal processing functions, specifically to remove unwanted frequency components from the signal, to enhance wanted ones, or both.
An electronic oscillator is an electronic circuit that produces a periodic, oscillating electronic signal, often a sine wave or a square wave.
Electronics is the discipline dealing with the development and application of devices and systems involving the flow of electrons in a vacuum, in gaseous media, and in semiconductors.
Electrostatic induction, also known as "electrostatic influence" or simply "influence" in Europe and Latin America, is a redistribution of electrical charge in an object, caused by the influence of nearby charges.
Elihu Thomson (March 29, 1853 – March 13, 1937) was an English-born American engineer and inventor who was instrumental in the founding of major electrical companies in the United States, the United Kingdom and France.
Etheric force is a term Thomas Edison coined to describe a phenomenon later understood as high frequency electromagnetic waves—effectively, radio.
Extremely high frequency (EHF) is the International Telecommunication Union (ITU) designation for the band of radio frequencies in the electromagnetic spectrum from 30 to 300 gigahertz (GHz).
In wireless communications, fading is variation or the attenuation of a signal with various variables.
The Family Radio Service (FRS) is an improved walkie-talkie radio system authorized in the United States since 1996.
FM broadcasting is a method of radio broadcasting using frequency modulation (FM) technology.
U.S. President Woodrow Wilson The Fourteen Points was a statement of principles for peace that was to be used for peace negotiations in order to end World War I. The principles were outlined in a January 8, 1918 speech on war aims and peace terms to the United States Congress by President Woodrow Wilson.
Frequency is the number of occurrences of a repeating event per unit of time.
Frequency allocation (or spectrum allocation or spectrum management) is the allocation and regulation of the electromagnetic spectrum into radio frequency bands, which is normally done by governments in most countries.
In telecommunications and signal processing, frequency modulation (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave.
In telecommunications, frequency-division multiplexing (FDM) is a technique by which the total bandwidth available in a communication medium is divided into a series of non-overlapping frequency bands, each of which is used to carry a separate signal.
Frequency-shift keying (FSK) is a frequency modulation scheme in which digital information is transmitted through discrete frequency changes of a carrier signal.
A gamma ray or gamma radiation (symbol γ or \gamma), is penetrating electromagnetic radiation arising from the radioactive decay of atomic nuclei.
George Adams the younger (1750–1795) was an English optician and writer.
In television, a ghost is a replica of the transmitted image, offset in position, that is super-imposed on top of the main image.
The Global Positioning System (GPS), originally Navstar GPS, is a satellite-based radionavigation system owned by the United States government and operated by the United States Air Force.
Grand Rapids is the second-largest city in Michigan, and the largest city in West Michigan.
GSM (Global System for Mobile communications) is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation digital cellular networks used by mobile devices such as tablets, first deployed in Finland in December 1991.
Guglielmo Marconi, 1st Marquis of Marconi (25 April 187420 July 1937) was an Italian inventor and electrical engineer known for his pioneering work on long-distance radio transmission and for his development of Marconi's law and a radio telegraph system.
H.264 or MPEG-4 Part 10, Advanced Video Coding (MPEG-4 AVC) is a block-oriented motion-compensation-based video compression standard.
Heinrich Rudolf Hertz (22 February 1857 – 1 January 1894) was a German physicist who first conclusively proved the existence of the electromagnetic waves theorized by James Clerk Maxwell's electromagnetic theory of light.
The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second.
Heterodyning is a signal processing technique invented in 1901 by Canadian inventor-engineer Reginald Fessenden that creates new frequencies by combining or mixing two frequencies.
High fidelity (often shortened to hi-fi or hifi) is a term used by listeners, audiophiles and home audio enthusiasts to refer to high-quality reproduction of sound.
High frequency (HF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) between 3 and 30 megahertz (MHz).
High-definition television (HDTV) is a television system providing an image resolution that is of substantially higher resolution than that of standard-definition television, either analog or digital.
A hobby is a regular activity that is done for enjoyment, typically during one's leisure time.
The horizon or skyline is the apparent line that separates earth from sky, the line that divides all visible directions into two categories: those that intersect the Earth's surface, and those that do not.
iHeartMedia, Inc., formerly CC Media Holdings, Inc., is an American mass media corporation headquartered in San Antonio, Texas.
Infrared radiation (IR) is electromagnetic radiation (EMR) with longer wavelengths than those of visible light, and is therefore generally invisible to the human eye (although IR at wavelengths up to 1050 nm from specially pulsed lasers can be seen by humans under certain conditions). It is sometimes called infrared light.
The inverse-square law, in physics, is any physical law stating that a specified physical quantity or intensity is inversely proportional to the square of the distance from the source of that physical quantity.
The ionosphere is the ionized part of Earth's upper atmosphere, from about to altitude, a region that includes the thermosphere and parts of the mesosphere and exosphere.
Sir Jagadish Chandra Bose, CSI, CIE, FRS (30 November 1858 – 23 November 1937), also spelled Jagdish and Jagadis, was a polymath, physicist, biologist, biophysicist, botanist and archaeologist, and an early writer of science fiction.
James Clerk Maxwell (13 June 1831 – 5 November 1879) was a Scottish scientist in the field of mathematical physics.
Joseph Henry (December 17, 1797 – May 13, 1878) was an American scientist who served as the first Secretary of the Smithsonian Institution.
KTNN is a Navajo language AM (medium-wave) radio station broadcasting on 660 AM from Window Rock, Arizona, the seat of the government of the Navajo Nation.
An LC circuit, also called a resonant circuit, tank circuit, or tuned circuit, is an electric circuit consisting of an inductor, represented by the letter L, and a capacitor, represented by the letter C, connected together.
Lee de Forest (August 26, 1873 – June 30, 1961) was an American inventor, self-described "Father of Radio", and a pioneer in the development of sound-on-film recording used for motion pictures.
Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum.
The following is a list of radio stations in the United States that are authorized to run 50 kW (50,000 watts) of power.
A locomotive or engine is a rail transport vehicle that provides the motive power for a train.
LORAN, short for long range navigation, was a hyperbolic radio navigation system developed in the United States during World War II.
A loudspeaker (or loud-speaker or speaker) is an electroacoustic transducer; which converts an electrical audio signal into a corresponding sound.
LowFER (Low-Frequency Experimental Radio) refers to experimental radio communication practiced by hobbyists on frequencies below 300 kHz, a part of the radio spectrum known as low frequency.
Luigi Aloisio Galvani (Aloysius Galvanus; 9 September 1737 – 4 December 1798) was an Italian physician, physicist, biologist and philosopher, who discovered animal electricity.
Madison Square Garden, often called "MSG" or simply "The Garden", is a multi-purpose indoor arena in the New York City borough of Manhattan.
Marine VHF radio refers to the radio frequency range between 156 and 174 MHz, inclusive.
Medium wave (MW) is the part of the medium frequency (MF) radio band used mainly for AM radio broadcasting.
A microphone, colloquially nicknamed mic or mike, is a transducer that converts sound into an electrical signal.
Microwaves are a form of electromagnetic radiation with wavelengths ranging from one meter to one millimeter; with frequencies between and.
A microwave oven (also commonly referred to as a microwave) is an electric oven that heats and cooks food by exposing it to electromagnetic radiation in the microwave frequency range.
Military communications or military signals involve all aspects of communications, or conveyance of information, by armed forces.
In modern language, a missile is a guided self-propelled system, as opposed to an unguided self-propelled munition, referred to as a rocket (although these too can also be guided).
Mobile telephony is the provision of telephone services to phones which may move around freely rather than stay fixed in one location.
In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted.
Morse code is a method of transmitting text information as a series of on-off tones, lights, or clicks that can be directly understood by a skilled listener or observer without special equipment.
MPEG transport stream (transport stream, MPEG-TS, MTS or TS) is a standard digital container format for transmission and storage of audio, video, and Program and System Information Protocol (PSIP) data.
MPEG-1 Audio Layer II or MPEG-2 Audio Layer II (MP2, sometimes incorrectly called Musicam or MUSICAM) is a lossy audio compression format defined by ISO/IEC 11172-3 alongside MPEG-1 Audio Layer I and MPEG-1 Audio Layer III (MP3).
MPEG-2 (a.k.a. H.222/H.262 as defined by the ITU) is a standard for "the generic coding of moving pictures and associated audio information".
In the United States, the Multi-Use Radio Service (MURS) is an unlicensed two-way radio service similar to Citizens Band (CB).
Nikola Tesla (Никола Тесла; 10 July 1856 – 7 January 1943) was a Serbian-American inventor, electrical engineer, mechanical engineer, physicist, and futurist who is best known for his contributions to the design of the modern alternating current (AC) electricity supply system.
In electronics, noise is an unwanted disturbance in an electrical signal.
Non-ionizing (or non-ionising) radiation refers to any type of electromagnetic radiation that does not carry enough energy per quantum (photon energy) to ionize atoms or molecules—that is, to completely remove an electron from an atom or molecule.
NTSC, named after the National Television System Committee,National Television System Committee (1951–1953),, 17 v. illus., diagrs., tables.
Sir Oliver Joseph Lodge, (12 June 1851 – 22 August 1940) was a British physicist and writer involved in the development of, and holder of key patents for, radio.
On-off keying (OOK) denotes the simplest form of amplitude-shift keying (ASK) modulation that represents digital data at the presence or absence of a carrier wave.
Optics is the branch of physics which involves the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it.
In telecommunications, orthogonal frequency-division multiplexing (OFDM) is a method of encoding digital data on multiple carrier frequencies.
The following outline is provided as an overview of and topical guide to radio: Radio – transmission of signals by modulation of electromagnetic waves with frequencies below those of visible light.
Phase is the position of a point in time (an instant) on a waveform cycle.
Phase modulation (PM) is a modulation pattern for conditioning communication signals for transmission.
The photon is a type of elementary particle, the quantum of the electromagnetic field including electromagnetic radiation such as light, and the force carrier for the electromagnetic force (even when static via virtual particles).
The photophone is a telecommunications device that allows transmission of speech on a beam of light.
The Pioneer program is a series of United States unmanned space missions that were designed for planetary exploration.
Pirate radio or a pirate radio station is a radio station that broadcasts without a valid license.
Polarization (also polarisation) is a property applying to transverse waves that specifies the geometrical orientation of the oscillations.
Position fixing is the branch of navigation concerned with the use of a variety of visual and electronic methods to determine the position of a vehicle or person on the surface of the Earth.
Positioning refers to the place that a brand occupies in the mind of the customer and how it is distinguished from products from competitors.
Power-line communication (PLC) carries data on a conductor that is also used simultaneously for AC electric power transmission or electric power distribution to consumers.
The public switched telephone network (PSTN) is the aggregate of the world's circuit-switched telephone networks that are operated by national, regional, or local telephony operators, providing infrastructure and services for public telecommunication.
Pulse-width modulation (PWM), or pulse-duration modulation (PDM), is a modulation technique used to encode a message into a pulsing signal.
Quadrature amplitude modulation (QAM) is the name of a family of digital modulation methods and a related family of analog modulation methods widely used in modern telecommunications to transmit information.
Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects.
Radiant may refer to.
Radiation therapy or radiotherapy, often abbreviated RT, RTx, or XRT, is therapy using ionizing radiation, generally as part of cancer treatment to control or kill malignant cells and normally delivered by a linear accelerator.
Radio broadcasting is transmission by radio waves intended to reach a wide audience.
Radio control (often abbreviated to R/C or simply RC) is the use of radio signals to remotely control a device.
A radio direction finder (RDF) is a device for finding the direction, or ''bearing'', to a radio source.
Radio frequency (RF) refers to oscillatory change in voltage or current in a circuit, waveguide or transmission line in the range extending from around twenty thousand times per second to around three hundred billion times per second, roughly between the upper limit of audio and the lower limit of infrared.
Radio jamming is the deliberate jamming, blocking or interference with authorized wireless communications.
Radio programming is the process of organising a schedule of radio content for commercial broadcasting and public broadcasting by radio stations.
A radio quiet zone is an area where radio transmissions are restricted in order to protect a radio telescope or a communications station from radio frequency interference.
In radio communications, a radio receiver (receiver or simply radio) is an electronic device that receives radio waves and converts the information carried by them to a usable form.
The radio spectrum is the part of the electromagnetic spectrum with frequencies from 3 Hz to 3 000 GHz (3 THz).
Radio Times is a British weekly television and radio programme listings magazine.
Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light.
Radio controlled (or R/C) cars are battery/gas-powered model cars or trucks that can be controlled from a distance using a specialized transmitter or remote.
Radio-frequency engineering, or RF engineering, is a subset of electrical engineering involving the application of transmission line, waveguide, antenna and electromagnetic field principles to the design and application of devices that produce or utilize signals within the range of about 20 kHz up to 300 GHz.
Radioactive decay (also known as nuclear decay or radioactivity) is the process by which an unstable atomic nucleus loses energy (in terms of mass in its rest frame) by emitting radiation, such as an alpha particle, beta particle with neutrino or only a neutrino in the case of electron capture, gamma ray, or electron in the case of internal conversion.
A radiotelephone (or radiophone) is a communications system for transmission of speech over radio.
Radioteletype (RTTY) is a telecommunications system consisting originally of two or more electromechanical teleprinters in different locations connected by radio rather than a wired link.
The RCA Corporation was a major American electronics company, which was founded as the Radio Corporation of America in 1919.
Reed–Solomon codes are a group of error-correcting codes that were introduced by Irving S. Reed and Gustave Solomon in 1960.
Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated.
Refraction is the change in direction of wave propagation due to a change in its transmission medium.
In physics, resonance is a phenomenon in which a vibrating system or external force drives another system to oscillate with greater amplitude at specific frequencies.
RMS Titanic was a British passenger liner that sank in the North Atlantic Ocean in the early hours of 15 April 1912, after colliding with an iceberg during its maiden voyage from Southampton to New York City.
San Jose (Spanish for 'Saint Joseph'), officially the City of San José, is an economic, cultural, and political center of Silicon Valley and the largest city in Northern California.
A satellite navigation or satnav system is a system that uses satellites to provide autonomous geo-spatial positioning.
A satellite telephone, satellite phone, or satphone is a type of mobile phone that connects to orbiting satellites instead of terrestrial cell sites.
Satellite radio is defined by the International Telecommunication Union (ITU)'S ITU Radio Regulations (RR) as a broadcasting-satellite service.
Shortwave radio is radio transmission using shortwave radio frequencies.
Signal-to-noise ratio (abbreviated SNR or S/N) is a measure used in science and engineering that compares the level of a desired signal to the level of background noise.
In radio communications, single-sideband modulation (SSB) or single-sideband suppressed-carrier modulation (SSB-SC) is a type of modulation, used to transmit information, such as an audio signal, by radio waves.
Sirius Satellite Radio was a satellite radio (SDARS) and online radio service operating in North America, owned by Sirius XM Holdings.
In physics, sound is a vibration that typically propagates as an audible wave of pressure, through a transmission medium such as a gas, liquid or solid.
A spark-gap transmitter is a device that generates radio frequency electromagnetic waves using a spark gap.
Speech is the vocalized form of communication used by humans and some animals, which is based upon the syntactic combination of items drawn from the lexicon.
In telecommunication and radio communication, spread-spectrum techniques are methods by which a signal (e.g., an electrical, electromagnetic, or acoustic signal) generated with a particular bandwidth is deliberately spread in the frequency domain, resulting in a signal with a wider bandwidth.
Subsidiary Communications Authorization (SCA) in the United States, and Subsidiary Communications Multiplex Operation (SCMO) in Canada, is a subcarrier on a radio station, allowing the station to broadcast additional services as part of its signal.
A tactical air navigation system, commonly referred to by the acronym TACAN, is a navigation system used by military aircraft.
A technical standard is an established norm or requirement in regard to technical systems.
Telecommunication is the transmission of signs, signals, messages, words, writings, images and sounds or information of any nature by wire, radio, optical or other electromagnetic systems.
Telegraphy (from Greek: τῆλε têle, "at a distance" and γράφειν gráphein, "to write") is the long-distance transmission of textual or symbolic (as opposed to verbal or audio) messages without the physical exchange of an object bearing the message.
In telecommunication, the term terminal equipment has the following meanings.
Terrestrial Trunked Radio (TETRA; formerly known as Trans-European Trunked Radio), a European standard for a trunked radio system, is a professional mobile radio and two-way transceiver specification.
Thomas Alva Edison (February 11, 1847October 18, 1931) was an American inventor and businessman, who has been described as America's greatest inventor.
Time of flight (TOF) is a property of an object, particle or acoustic, electromagnetic or other wave.
Time-division multiplexing (TDM) is a method of transmitting and receiving independent signals over a common signal path by means of synchronized switches at each end of the transmission line so that each signal appears on the line only a fraction of time in an alternating pattern.
A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power.
In telecommunications, transmission (abbreviations: TX, Xmit) is the process of sending and propagating an analogue or digital information signal over a physical point-to-point or point-to-multipoint transmission medium, either wired, optical fiber or wireless.
In electronics and telecommunications, a transmitter or radio transmitter is an electronic device which produces radio waves with an antenna.
A tuner is a subsystem that receives radio frequency (RF) transmissions like radio broadcasts and converts the selected carrier frequency and its associated bandwidth into a fixed frequency that is suitable for further processing, usually because a lower frequency is used on the output.
TV DX and FM DX is the active search for distant radio or television stations received during unusual atmospheric conditions.
Ultraviolet (UV) is electromagnetic radiation with a wavelength from 10 nm to 400 nm, shorter than that of visible light but longer than X-rays.
The Universal Mobile Telecommunications System (UMTS) is a third generation mobile cellular system for networks based on the GSM standard.
The user requirement(s) document (URD) or user requirement(s) specification (URS) is a document usually used in software engineering that specifies what the user expects the software to be able to do.
In electronics, a vacuum tube, an electron tube, or just a tube (North America), or valve (Britain and some other regions) is a device that controls electric current between electrodes in an evacuated container.
Very high frequency (VHF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) from 30 to 300 megahertz (MHz), with corresponding wavelengths of ten to one meter.
Very High Frequency (VHF) Omni-Directional Range (VOR) is a type of short-range radio navigation system for aircraft, enabling aircraft with a receiving unit to determine their position and stay on course by receiving radio signals transmitted by a network of fixed ground radio beacons.
A VORTAC is a navigational aid for aircraft pilots consisting of a co-located VHF omnidirectional range (VOR) beacon and a tactical air navigation system (TACAN) beacon.
A walkie-talkie (more formally known as a handheld transceiver, or HT) is a hand-held, portable, two-way radio transceiver.
WBCT (93.7 MHz, "B-93") is a commercial FM radio station licensed to Grand Rapids, Michigan and owned by iHeartMedia, Inc. The station has had a country music radio format since July 24, 1992.
Wi-Fi or WiFi is technology for radio wireless local area networking of devices based on the IEEE 802.11 standards.
A wireless local area network (WLAN) is a wireless computer network that links two or more devices using wireless communication within a limited area such as a home, school, computer laboratory, or office building.
A wireless network is a computer network that uses wireless data connections between network nodes.
Wireless telegraphy is the transmission of telegraphy signals from one point to another by means of an electromagnetic, electrostatic or magnetic field, or by electrical current through the earth or water.
Thomas Woodrow Wilson (December 28, 1856 – February 3, 1924) was an American statesman and academic who served as the 28th President of the United States from 1913 to 1921.
World War I (often abbreviated as WWI or WW1), also known as the First World War, the Great War, or the War to End All Wars, was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918.
World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945, although conflicts reflecting the ideological clash between what would become the Allied and Axis blocs began earlier.
X-rays make up X-radiation, a form of electromagnetic radiation.
XM Satellite Radio (XM) was one of the three satellite radio (SDARS) and online radio services in the United States and Canada, operated by Sirius XM Holdings.
1worldspace, known for most of its existence simply as 'WorldSpace', is a defunct satellite radio network that in its heyday provided service to over 170,000 subscribers in eastern and southern Africa, the Middle East, and much of Asia with 96% coming from India.
8VSB is the modulation method used for broadcast in the ATSC digital television standard.
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