Radio

radio communicationradio communicationswirelessradio transmissionterrestrial radioradiosradio channelradiocommunicationradio technologyterrestrial
Radio is the technology of signaling and communicating using radio waves.wikipedia
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Telecommunication

telecommunicationscommunicationstelecom
Radio is the technology of signaling and communicating using radio waves.
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.

Radio receiver

receiverreceiversRadios
They are generated by an electronic device called a transmitter connected to an antenna which radiates the waves, and received by a radio receiver connected to another antenna.
In radio communications, a radio receiver, also known as a receiver, wireless or simply radio is an electronic device that receives radio waves and converts the information carried by them to a usable form.

Radio navigation

radionavigation serviceradio navigation aidradionavigation
Radio is very widely used in modern technology, in radio communication, radar, radio navigation, remote control, remote sensing and other applications.
Radio navigation or radionavigation is the application of radio frequencies to determine a position of an object on the Earth.

Two-way radio

two way radioRadio Operatortwo-way radios
In radio communication, used in radio and television broadcasting, cell phones, two-way radios, wireless networking and satellite communication among numerous other uses, radio waves are used to carry information across space from a transmitter to a receiver, by modulating the radio signal (impressing an information signal on the radio wave by varying some aspect of the wave) in the transmitter.
A two-way radio is a radio that can both transmit and receive a signal (a transceiver), unlike a broadcast receiver which only receives content.

Antenna (radio)

antennaantennasradio antenna
They are generated by an electronic device called a transmitter connected to an antenna which radiates the waves, and received by a radio receiver connected to another antenna.
Antennas are essential components of all radio equipment.

Wireless network

wireless networkingwireless networkswireless
In radio communication, used in radio and television broadcasting, cell phones, two-way radios, wireless networking and satellite communication among numerous other uses, radio waves are used to carry information across space from a transmitter to a receiver, by modulating the radio signal (impressing an information signal on the radio wave by varying some aspect of the wave) in the transmitter.
admin telecommunications networks are generally implemented and administered using radio communication.

Radio control

radio-controlledradio controlledradio-control
In wireless radio remote control devices like drones, garage door openers, and keyless entry systems, radio signals transmitted from a controller device control the actions of a remote device.
Radio control (often abbreviated to R/C or simply RC) is the use of control signals transmitted by radio to remotely control a device.

Guglielmo Marconi

MarconiMarconi WirelessMarconi's Wireless Telegraph Company
The first practical radio transmitters and receivers were developed around 1895-6 by Italian Guglielmo Marconi, and radio began to be used commercially around 1900.
Guglielmo Marconi, 1st Marquis of Marconi FRSA (25 April 1874 – 20 July 1937) was an Italian inventor and electrical engineer, known for his pioneering work on long-distance radio transmission, development of Marconi's law, and a radio telegraph system.

Radio spectrum

bandradio bandspectrum
To prevent interference between users, the emission of radio waves is strictly regulated by law, coordinated by an international body called the International Telecommunications Union (ITU), which allocates frequency bands in the radio spectrum for different uses. Because it is a fixed resource which is in demand by an increasing number of users, the radio spectrum has become increasingly congested in recent decades, and the need to use it more effectively is driving many additional radio innovations such as trunked radio systems, spread spectrum (ultra-wideband) transmission, frequency reuse, dynamic spectrum management, frequency pooling, and cognitive radio. Digital television (DTV) transmission systems, which replaced older analog television in a transition beginning in 2006, use image compression and high efficiency digital modulation such as OFDM and 8VSB to transmit HDTV video within a smaller bandwidth than the old analog channels, saving scarce radio spectrum space.
To prevent interference between different users, the generation and transmission of radio waves is strictly regulated by national laws, coordinated by an international body, the International Telecommunication Union (ITU).

Omnidirectional antenna

non-directional antennaomnidirectionalnon-directional
An omnidirectional antenna transmits or receives radio waves in all directions, while a directional antenna or high gain antenna transmits radio waves in a beam in a particular direction, or receives waves from only one direction.
In radio communication, an omnidirectional antenna is a class of antenna which radiates equal radio power in all directions perpendicular to an axis (azimuthal directions), with power varying with angle to the axis (elevation angle), declining to zero on the axis.

Frequency

frequenciesperiodperiodic
Radio waves are electromagnetic waves of frequency between 30 hertz (Hz) and 300 gigahertz (GHz).
In physics and engineering disciplines, such as optics, acoustics, and radio, frequency is usually denoted by a Latin letter f or by the Greek letter \nu or ν (nu) (see e.g. Planck's formula).

Sideband

double sidebandsidebandsupper sideband
The information (modulation) in a radio signal is usually concentrated in narrow frequency bands called sidebands (SB) just above and below the carrier frequency.
In radio communications, a sideband is a band of frequencies higher than or lower than the carrier frequency, that are the result of the modulation process.

Microphone

microphonescondenser microphonedynamic microphone
Microphones are used in many applications such as telephones, hearing aids, public address systems for concert halls and public events, motion picture production, live and recorded audio engineering, sound recording, two-way radios, megaphones, radio and television broadcasting, and in computers for recording voice, speech recognition, VoIP, and for non-acoustic purposes such as ultrasonic sensors or knock sensors.

Transmitter

radio transmittertransmittersradio transmitters
They are generated by an electronic device called a transmitter connected to an antenna which radiates the waves, and received by a radio receiver connected to another antenna. In transmission, a transmitter generates an alternating current of radio frequency which is applied to an antenna.
Transmitters are necessary component parts of all electronic devices that communicate by radio, such as radio and television broadcasting stations, cell phones, walkie-talkies, wireless computer networks, Bluetooth enabled devices, garage door openers, two-way radios in aircraft, ships, spacecraft, radar sets and navigational beacons.

Amplitude modulation

AMamplitude modulatedamplitude-modulated
Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting information via a radio carrier wave.

Radio frequency

RFradio frequenciesradio-frequency
In transmission, a transmitter generates an alternating current of radio frequency which is applied to an antenna.

Cognitive radio

autonomous interference cognitionCognitive communicationscognitive radio networks
Because it is a fixed resource which is in demand by an increasing number of users, the radio spectrum has become increasingly congested in recent decades, and the need to use it more effectively is driving many additional radio innovations such as trunked radio systems, spread spectrum (ultra-wideband) transmission, frequency reuse, dynamic spectrum management, frequency pooling, and cognitive radio.
A cognitive radio (CR) is a radio that can be programmed and configured dynamically to use the best wireless channels in its vicinity to avoid user interference and congestion.

Spread spectrum

spread-spectrumDigital Spread SpectrumSpread-spectrum clocking
Because it is a fixed resource which is in demand by an increasing number of users, the radio spectrum has become increasingly congested in recent decades, and the need to use it more effectively is driving many additional radio innovations such as trunked radio systems, spread spectrum (ultra-wideband) transmission, frequency reuse, dynamic spectrum management, frequency pooling, and cognitive radio.
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.

Hertz

MHzkHzHz
Radio waves are electromagnetic waves of frequency between 30 hertz (Hz) and 300 gigahertz (GHz).
Some of the unit's most common uses are in the description of sine waves and musical tones, particularly those used in radio- and audio-related applications.

Call sign

call letterscallsigncall signs
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 callsign, which must be used in all transmissions.
In broadcasting and radio communications, a call sign (also known as a call name or call letters—and historically as a call signal—or abbreviated as a call) is a unique designation for a transmitter station.

Carrier wave

carrier frequencycarriercarrier signal
The information (modulation) in a radio signal is usually concentrated in narrow frequency bands called sidebands (SB) just above and below the carrier frequency.
The purpose of the carrier is usually either to transmit the information through space as an electromagnetic wave (as in radio communication), or to allow several carriers at different frequencies to share a common physical transmission medium by frequency division multiplexing (as in a cable television system, for example).

Baby monitor

baby monitorsbaby-monitoring devicesinfant monitor
Exceptions to the above rules allow the unlicensed operation by the public of low power short range transmitters in consumer products such as cell phones, cordless phones, wireless devices, walkie-talkies, citizens band radios, wireless microphones, garage door openers, and baby monitors.
A baby monitor, also known as a baby alarm, is a radio system used to remotely listen to sounds made by an infant.

Cordless telephone

cordless phonecordless phonescordless telephones
Exceptions to the above rules allow the unlicensed operation by the public of low power short range transmitters in consumer products such as cell phones, cordless phones, wireless devices, walkie-talkies, citizens band radios, wireless microphones, garage door openers, and baby monitors.
A cordless telephone or portable telephone is a telephone in which the handset is portable and communicates with the body of the phone by radio, instead of being attached by a cord.

Digital television

digitaldigital TVDTV
Digital television (DTV) transmission systems, which replaced older analog television in a transition beginning in 2006, use image compression and high efficiency digital modulation such as OFDM and 8VSB to transmit HDTV video within a smaller bandwidth than the old analog channels, saving scarce radio spectrum space.

Shortwave radio

shortwaveshort waveshort-wave
The shortwave bands have greater potential range, but are more subject to interference by distant stations and varying atmospheric conditions that affect reception.
Shortwave radio is radio transmission using shortwave radio frequencies.