FM broadcasting in the context of Frequency deviation

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. DRM is more spectrally efficient than AM and FM, allowing more stations, at higher quality, into a given amount of bandwidth, using xHE-AAC audio coding format. Various other MPEG-4 codecs and Opus are also compatible, but the standard now specifies xHE-AAC.

Digital Radio Mondiale is also the name of the international non-profit consortium that has designed the platform and is now promoting its introduction. Radio France Internationale, TéléDiffusion de France, BBC World Service, Deutsche Welle, Voice of America, Telefunken (now Transradio) and Thomcast (now Ampegon) took part at the formation of the DRM consortium.

In electronics and telecommunications, a radio transmitter or just transmitter (often abbreviated as XMTR or TX in technical documents) is an electronic device which produces radio waves with an antenna with the purpose of signal transmission 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.

Transmitters are necessary component parts of all electronic devices that communicate by radio, such as radio (audio) 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. The term transmitter is usually limited to equipment that generates radio waves for communication purposes; or radiolocation, such as radar and navigational transmitters. Generators of radio waves for heating or industrial purposes, such as microwave ovens or diathermy equipment, are not usually called transmitters, even though they often have similar circuits.

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 (also known as "AM band") transmissions, but also on the longwave and shortwave radio bands.

The earliest experimental AM transmissions began in the early 1900s. However, widespread AM broadcasting was not established until the 1920s, following the development of vacuum tube receivers and transmitters. AM radio remained the dominant method of broadcasting for the next 30 years, a period called the "Golden Age of Radio", until television broadcasting became widespread in the 1950s and received much of the programming previously carried by radio. Later, AM radio's audiences declined greatly due to competition from FM (frequency modulation) radio, Digital Audio Broadcasting (DAB), satellite radio, HD (digital) radio, Internet radio, music streaming services, and podcasting.

An antenna farm, satellite dish farm or dish farm is an area dedicated to television or radio telecommunications transmitting or receiving antenna equipment, such as C, K_u or K_a band satellite dish antennas, UHF/VHF/AM/FM transmitter towers or mobile cell towers. The history of the term "antenna farm" is uncertain, but it dates to at least the 1950s.

In telecom circles, any area with more than three antennas could be referred to as an antenna farm. In the case of an AM broadcasting station (mediumwave and longwave, occasionally shortwave), the multiple mast radiators may all be part of an antenna system for a single station, while for VHF and UHF the site may be under joint management. Alternatively, a single tower with many separate antennas is often called a "candelabra tower".

Kiss is a British digital radio station owned and operated by Bauer Media Audio UK as part of the Kiss Network. Kiss broadcasts nationally to the UK via DAB digital radio, as well as on Bauer's Rayo platform.

The station started in 1985 as a pirate radio station, Kiss FM, before becoming the UK's first legal black and dance music specialist radio station in 1990 as Kiss 100, broadcasting in London on 100.0 FM. Kiss became a digital-only station in 2024 when its FM frequencies in London, Norfolk and the west of England were taken over by Hits Radio.

Greatest Hits Radio (GHR) is a classic hits radio network in the United Kingdom, owned and operated by Bauer Media Audio UK. It currently includes 18 local and regional radio stations operating over 50 FM and DAB licences in England, Scotland and Wales, as well as a national DAB station in areas not served by a local Bauer-owned licence.

The GHR brand launched on 7 January 2019 as an "older" companion to Hits Radio, which Bauer had launched in 2018. It is a rebranding of the former Bauer City 2 Network (launched on 5 January 2015) due to the success of Radio City 2 in Liverpool on FM. All GHR stations are networked and include localised opt-outs for news, weather, travel and advertising. Until 31 October 2024, the stations aired a three-hour regional afternoon show on weekdays.

BBC Radio London is the BBC's local radio station serving Greater London.

It broadcasts on FM, DAB, digital TV and via BBC Sounds from studios at Broadcasting House in Langham Place, London.

Digital Audio Broadcasting (DAB) is a digital radio standard for broadcasting digital audio radio services in many countries around the world, defined, supported, marketed and promoted by the WorldDAB organization. The standard is dominant in Europe and is also used in Australia, and in parts of Africa and as of 2025, 55 countries are actively running DAB broadcasts as an alternative platform to analogue FM.

DAB was the result of a European research project and first publicly rolled out in 1995, with consumer-grade DAB receivers appearing around the late 1990’s. Initially it was expected in many countries that existing FM services would switch over to DAB, although the take-up of DAB has been much slower than expected. In 2023, Norway became the first country to have implemented a national FM radio switch-off, with Switzerland to follow in 2026 and others territories in the process of planning a switch-off. Terrestrial digital radio has become a requirement for all new cars (not buses and trucks) sold in the EU since 2021.

HD Radio (HDR) is a trademark for in-band on-channel (IBOC) digital radio broadcast technology. HD radio generally simulcasts an existing analog radio station in digital format with less noise and with additional text information. HD Radio is used primarily by FM radio stations in the United States, U.S. Virgin Islands, Canada, Mexico and the Philippines, with a few implementations outside North America.

HD Radio transmits the digital signals in unused portions of the same band as the analog AM and FM signals. As a result, radios are more easily designed to pick up both signals, which is why the HD in HD Radio is sometimes referred to stand for Hybrid Digital, not "High Definition". Officially, HD is not intended to stand for any term in HD Radio, it is simply part of iBiquity's trademark, and does not have any meaning on its own. HD Radios tune into the station's analog signal first and then look for a digital signal. The European DRM system shares channels similar to HD Radio, but the European DAB system uses different frequencies for its digital transmission.

A smartwatch is a portable wearable computer that resembles a wristwatch. Most modern smartwatches are operated via a touchscreen, and rely on mobile apps that run on a connected device (such as a smartphone) in order to provide core functions.

Early smartwatches were capable of performing basic functions like calculating, displaying digital time, translating text, and playing games. More recent models often offer features comparable to smartphones, including apps, a mobile operating system, Bluetooth and Wi-Fi connectivity, and the ability to function as portable media players or FM radios. Some high-end models have cellular capabilities, allowing users to make and receive phone calls.

The Nokia N800 Internet tablet is a wireless Internet appliance from Nokia, originally announced at the Las Vegas CES 2007 Summit in January 2007. N800 allows the user to browse the Internet and communicate using Wi-Fi networks or with mobile phone via Bluetooth. The N800 was developed as the successor to the Nokia 770. It includes FM and Internet radio, an RSS news reader, image viewer and a media player for audio and video files.

In electronics and radio, a tuner is a type of receiver subsystem that receives RF transmissions, such as AM or FM broadcasts, and converts the selected carrier frequency into a form suitable for further processing or output, such as to an amplifier or loudspeaker. A tuner is also a standalone home audio product, component, or device called an AM/FM tuner or a stereo tuner that is part of a hi-fi or stereo system, or a TV tuner for television broadcasts. The verb tuning in radio contexts means adjusting the receiver to detect the desired radio signal carrier frequency that a particular radio station uses. Tuners were a major consumer electronics product in the 20th century but in practice are often integrated into other products in the modern day, such as stereo or AV receivers or portable radios.

Emergency vehicle equipment is any equipment fitted to, or carried by, an emergency vehicle, other than the equipment that a standard non-emergency vehicle is fitted with (such as headlights, steering wheels, and windshield/windscreens).

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 (also known as "AM band") transmissions, but also on the longwave and shortwave radio bands.

The earliest experimental AM transmissions began in the early 1900s. However, widespread AM broadcasting was not established until the 1920s, following the development of vacuum tube receivers and transmitters. AM radio remained the dominant method of broadcasting for the next 30 years, a period called the "Golden Age of Radio", until television broadcasting became widespread in the 1950s and received much of the programming previously carried by radio. Later, AM radio's audiences declined greatly due to competition from FM radio, digital radio, satellite radio, Internet radio, music streaming services, and podcasting.

The BBC World Service is a British public service broadcaster owned and operated by the BBC. It is the world's largest external broadcaster in terms of reception area, language selection and audience reach. It broadcasts radio news, speech and discussions in more than 40 languages to many parts of the world on analogue and digital shortwave platforms, internet streaming, podcasting, satellite, DAB, FM, LW and MW relays. In 2024, the World Service reached an average of 450 million people a week (via TV, radio and online).

BBC World Service English maintains eight regional feeds with several programme variations, covering, respectively, East and Southern Africa; West and Central Africa; Europe and Middle East; the Americas and Caribbean; East Asia; South Asia; Australasia; and the United Kingdom. There are also two online-only streams, a general one and the other more news-orientated, known as News Internet. The service broadcasts 24 hours a day.

Biokovo (pronounced [bîɔkɔʋɔ]) is the second-highest mountain range in Croatia, located along the Dalmatian coast of the Adriatic Sea, between the rivers of Cetina and Neretva.

It is sometimes referred to as Bijakova, especially among inhabitants of the eastern side of the mountain. Its highest peak is Sveti Jure (Saint George), at 1762 m.a.s.l. It shows a typical karst landscape. Atop the peak there is a powerful FM and DVB-T transmitter.

A spark-gap transmitter is an obsolete type of radio transmitter which generates radio waves by means of an electric spark. Spark-gap transmitters were the first type of radio transmitter, and were the main type used during the wireless telegraphy or "spark" era, the first three decades of radio, from 1887 to the end of World War I. German physicist Heinrich Hertz built the first experimental spark-gap transmitters in 1887, with which he proved the existence of radio waves and studied their properties.

A fundamental limitation of spark-gap transmitters is that they generate a series of brief transient pulses of radio waves called damped waves; they are unable to produce the continuous waves used to carry audio (sound) in modern AM or FM radio transmission. So spark-gap transmitters could not transmit audio, and instead transmitted information by radiotelegraphy; the operator switched the transmitter on and off with a telegraph key, creating pulses of radio waves to spell out text messages in Morse code.

BBC Radio is an operational business division and service of the British Broadcasting Corporation (BBC) which has operated in the United Kingdom under the terms of a royal charter since 1927. The service provides national radio stations covering the majority of musical genres, as well as local radio stations covering local news, affairs, and interests. It also oversees online audio content.

Of the national radio stations, BBC Radio 1, 2, 3, 4, and 5 Live are all available through analogue radio (1, 2, 3 and 4 on FM and 5 Live on MW; BBC Radio 4 additionally broadcasts on longwave) as well as on DAB Digital Radio and BBC Sounds. BBC Radio 1Xtra, 1 Dance, 1 Anthems, 3 Unwind, 4 Extra, 5 Sports Extra, 6 Music, Asian Network and the World Service broadcast only on DAB and BBC Sounds.All of the BBC's national radio stations broadcast from bases in London and Manchester, usually in or near to Broadcasting House or MediaCityUK. However, the BBC's network production units located in Belfast, Birmingham, Bristol, Cardiff and Glasgow also make radio programmes.