Low frequency (LF) is the ITU designation for radio frequencies (RF) in the range of 30–300 kHz. Since its wavelengths range from 10–1 km, respectively, it is also known as the kilometre band or kilometre waves.
In radio, longwave, long wave or long-wave, and commonly abbreviated LW, refers to parts of the radio spectrum with wavelengths longer than what was originally called the medium-wave broadcasting band. The term is historic, dating from the early 20th century, when the radio spectrum was considered to consist of longwave (LW), medium-wave (MW), and short-wave (SW) radio bands. Most modern radio systems and devices use wavelengths which would then have been considered 'ultra-short'.
The Warsaw Radio Mast was a radio mast located near Gąbin, Poland, and was the world's tallest structure at 2,120 ft from 1974 until its collapse on 8 August 1991. The mast was designed for extreme height in order to broadcast Communist propaganda around the world, including to the remotest areas such as Antarctica. As of 2023, it was the third-tallest manmade structure ever built, after the Burj Khalifa tower in the United Arab Emirates in 2009, and Merdeka 118 tower in Malaysia in 2022.
The Longwave transmitter Solec Kujawski is a longwave broadcasting facility of Polskie Radio for the AM-LW (longwave) 225 kHz frequency/1333 meters wavelength. Its construction was necessitated by the collapse of the Warsaw radio mast on 8 August 1991 and the resistance of the local population to its reconstruction. Tower Height 948 feet/289 meters and 1080 feet/330 meters. Height above sea level 209 feet/64 meters MSL.
The Longwave transmitter Europe 1 was the oldest privately owned radio station in Germany, situated between Felsberg and Berus/Saar, Germany. It transmitted on 183 kHz with a power of 2,000 kilowatts a French speaking programme, Europe 1 toward France. It was the highest power radio broadcasting transmitter in Germany. Longwave transmissions stopped on 31 December 2019.
The Roumoules transmitter is the main broadcasting facility for longwave and mediumwave broadcasting of Radio Monte Carlo near Roumoules, France and is owned by Monaco Media Diffusion. The 1000 and 2000kW transmitters installed are among the most powerful in the world and can be received well at nighttime throughout Europe.
The Junglinster Longwave Transmitter is a longwave broadcasting facility used by RTL near Junglinster, Luxembourg, which went into service in 1932. Its aerial consists of three free-standing steel-framework towers, which are ground fed radiators. These towers formed a directional aerial for the frequency 234 kHz and until 1980 were 250 metres high. Since 1980 their height has been 215 metres.
The Langenberg transmission tower is a broadcasting station for ananlog FM Radio and Digital-TV signals. It is located in Langenberg, Velbert, Germany and owned and operated by Westdeutscher Rundfunk, WDR.
The Droitwich transmitting station is a large broadcasting facility for long-wave and medium-wave transmissions, established in 1934 in the civil parish of Dodderhill, just outside the village of Wychbold, near Droitwich in Worcestershire, England. The site is the location of the British Broadcasting Corporation's most powerful long-wave transmitter, which together with the two Scottish long-wave transmitters at Burghead and Westerglen forms a network broadcasting on the same frequency. The masts can be seen to the east from the M5 motorway, between Droitwich and Bromsgrove, as well as to the west from the Herefordshire/Worcestershire border. At night, the two sets of aircraft warning lights are visible from a long distance. The station is owned and operated by Arqiva.
Kalundborg Radio was a major transmission facility for long- and mediumwave at the harbour of Kalundborg in Denmark. Longwave broadcasts on 243 kHz began on 27 August 1927 and ceased on 31 December 2023. Mediumwave broadcasts on 1062 kHz began on 1 October 1951 and ceased in June 2011.
The Orlunda longwave transmitter was a longwave broadcast facility in central Sweden which broadcast Sveriges Radio Programme 1 from 1962 to 1991. The facility is currently in use as a museum.
Allouis is a commune in the Cher department of the Centre-Val de Loire region of France.
Deutschlandfunk is a public-broadcasting radio station in Germany, concentrating on news and current affairs. It is one of the four national radio channels produced by Deutschlandradio.
France Inter is a French public radio channel and part of Radio France. It is the successor to Paris Inter, later known as France I, and created as a merger of the France I and France II networks, first as RTF Inter in October 1963, then renamed to its current name in December of that year. It is a "generalist" station, aiming to provide a wide national audience with a full service of news and spoken-word programming, both serious and entertaining, liberally punctuated with an eclectic mix of music. It is broadcast on FM from a nationwide network of transmitters, as well as via the internet.
A broadcast transmitter is an electronic device which radiates radio waves modulated with information content intended to be received by the general public. Examples are a radio broadcasting transmitter which transmits audio (sound) to broadcast radio receivers (radios) owned by the public, or a television transmitter, which transmits moving images (video) to television receivers (televisions). The term often includes the antenna which radiates the radio waves, and the building and facilities associated with the transmitter. A broadcasting station consists of a broadcast transmitter along with the production studio which originates the broadcasts. Broadcast transmitters must be licensed by governments, and are restricted to specific frequencies and power levels. Each transmitter is assigned a unique identifier consisting of a string of letters and numbers called a callsign, which must be used in all broadcasts.
ALS162 is a French longwave time signal and standard-frequency radio station and is used for the dissemination of the Metropolitan French national legal time to the public. TéléDiffusion de France broadcast the ALS162 time signal, provided by LNE-SYRTE and LNE-LTFB time laboratories under ANFR responsibility, from the Allouis longwave transmitter at 162 kHz, with a power of 800 kW.
The Tullamore transmitter was an AM radio transmission mast located near Tullamore, Ireland. Built in 1975 to replace the Athlone transmitter, it always carried RTÉ Radio 1 on 567 kHz, at 500 kW. The old Athlone mast was used to carry RTÉ 2fm, and was later decommissioned. The Tullamore transmitter was demolished in 2023.
The Topolná transmitter was the central longwave broadcasting facility of the Czech Republic situated in the municipality of Topolná near the Morava River. Constructed in the early 1950s, it was used for broadcasting until the end of 2021, and its masts were blasted down in 2022.
Marnach transmitter was a broadcasting facility of RTL near Marnach in the commune of Clervaux, in northern Luxembourg. The Marnach transmitter was built in 1955 for improving the transmission of the English-speaking program on 1439 kHz, which was transmitted from 1951 with an omnidirectional antenna from Junglinster, to the British Isles and for a better transmission on this frequency to Germany at daytime. Therefore, it was given a directional antenna with a switchable directional characteristic pointing north-northeast towards the Rhine-Ruhr area, Germany's most populated area, and west-northwest in the direction of the UK. This antenna was implemented in form of a directional antenna consisting of three ground-fed 105-metre-tall (350 ft) guyed mast antennas arranged in the form of an isosceles triangle with a 90-degree angle. As transmitters, two 100 kW units switched in parallel were used when it went in service in December 1955.
Nador transmitter is the main transmission facility for longwave and shortwave of Medi 1 Radio, a privately owned broadcasting company of Morocco. It is situated approximately 18 kilometres south of the city of Nador and a few kilometres south of Selouane at 35°2'29"N and 2°55'7"W.
