Medium wave (MW) is the part of the medium frequency (MF) radio band used mainly for AM radio broadcasting. The spectrum provides about 120 channels with more limited sound quality than FM stations on the FM broadcast band. During the daytime, reception is usually limited to more local stations, though this is dependent on the signal conditions and quality of radio receiver used. Improved signal propagation at night allows the reception of much longer distance signals. This can cause increased interference because on most channels multiple transmitters operate simultaneously worldwide. In addition, amplitude modulation (AM) is often more prone to interference by various electronic devices, especially power supplies and computers. Strong transmitters cover larger areas than on the FM broadcast band but require more energy and longer antennas. Digital modes are possible but have not reached momentum yet.
A guyed mast or guyed tower is a tall thin vertical structure that depends on guy lines for stability. The mast itself has the compressive strength to support its own weight, but does not have the shear strength to stand unsupported. It requires guy lines to stay upright and to resist lateral forces such as wind loads. Guy lines are usually spaced at equal angles about the structure's base.
The Mühlacker Broadcasting Transmission Facility is a radio transmission facility near Mühlacker, Germany, first put into service on November 21, 1930. It uses two guyed steel tube masts as aerials and one guyed steel framework mast, which are insulated against ground. It has two transmission aerials for shortwave and one free standing steel framework tower for directional radio services. The shortwave transmitter was shut off on October 19, 2004. The medium wave transmitter was switched off in January 2012.
Kalundborg Radio is a major transmission facility for long- and mediumwave at the harbour of Kalundborg in Denmark.
The Transmitter Ismaning was a large radio transmitting station near Ismaning, Bavaria, Germany. It was inaugurated in 1932. From 1932 to 1934 this transmitter used a T-antenna as transmitting antenna, which was spun between two 115-metre-high free-standing wooden lattice towers, which were 240 metres apart. As this antenna had an unfavourable vertical radiation pattern, which produced much skywave resulting in a too small fading-free reception area at night, in 1934 a new antenna was installed. Therefore, one of the towers was dismantled and rebuilt on a 39-metre-high (128 ft) wooden lattice base. While this work took place, an L-Antenna was used, which was spun between the other tower and a small auxiliary wooden tower. It became defunct in 1977 and was destroyed in 1983.
The Sender Bielstein is an FM- and TV-broadcasting facility on the 393-metre-high Bielstein mountain in the Forest of Teutoburg, North Rhine-Westphalia, Germany.
The Rheinsender is a large medium-wave transmission facility near Wolfsheim, southwest of Mainz for the frequency 1017 kHz. The Rhine transmitter was established in 1950 and went on the air May 15, 1950. It belongs to SWR and transmitted until the middle of the 1990s with 600 kilowatts. In the last years the transmission power was reduced to 100 kilowatts.
The Żórawina radio transmitter is a facility for FM transmission at Żórawina, south of Wrocław. It was established in 1932 as "Reichssender Breslau" and used as an antenna tower. Originally it was a 140-metre-tall free-standing lattice tower built of wood, on which a wire antenna was hung up. On the top of the tower there was an octagonal ring of bronze with a diameter of 10.6 metres for electrical lengthening of the antenna.
The Wavre radio transmitter is a facility for Fm, Dab+ and TV broadcasting near Wavre in Belgium. Formerly the mediumwave transmissions used a grounded 250-metre-high guyed mast. Furthermore, there was a backup mast for medium wave transmissions, which was 90 metres high. For shortwave broadcasting there were several directional antennas and a curtain antenna.
Radio masts and towers are typically tall structures designed to support antennas for telecommunications and broadcasting, including television. There are two main types: guyed and self-supporting structures. They are among the tallest human-made structures. Masts are often named after the broadcasting organizations that originally built them or currently use them.
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.
The WITI TV Tower is a lattice communications tower located in Shorewood, Wisconsin, which transmits the signal of several television and radio stations in the Milwaukee area, including its namesake, Fox owned-and-operated station WITI, along with cellular and wireless communications. The structure is owned by WITI's parent company, Fox Television Stations. The 1,081 feet (329 m) tower built in 1962 was for many years the tallest free-standing tower in the United States until the Stratosphere Tower was built in 1996. It remains the tallest lattice tower in the country and the tallest 3-side lattice tower in the world.
Löffelstelzen Transmitter is a broadcasting facility of SWR at Bad Mergentheim-Löffelstelzen in northern Baden-Württemberg, Germany. It was inaugurated at the beginning of the 1950s and used at those days a guyed mast, which was insulated against ground, because it was used for medium-wave broadcasting with a butterfly antenna for FM- and TV-transmission on its top. Later this mast was replaced by a concrete tower, which carried an antenna for FM-/TV-broadcasting on its top and a cage and a wire antenna for medium-wave broadcasting at its site. This tower was replaced between 1998 and 2000 by a 179 metre tall concrete tower. This tower is not equipped with an antenna for medium wave broadcasting, because this was ceased in 2000 at the Löffelstelzen transmission site.
The Wiederau transmitter is the oldest broadcasting facility in Saxony. It is located near Wiederau, a village which is part of the municipality of Pegau, and is used for medium-wave, FM and Television broadcasting.
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 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.
Hoher Meissner transmitter is a facility for FM and TV broadcasting on Hoher Meissner mountain in Northern Hesse. The transmitter was inaugurated in 1952.
Venets Transmitter is a facility for FM and TV-broadcasting near Venets and Samuil in Shumen Province, Bulgaria. Venets Transmitter uses as antenna tower a 302 metre tall guyed lattice steel mast with rectangular cross section. This mast, which was built in 1975, is the tallest radio mast in Bulgaria. The TV transmitter, which used it as antenna, was the most powerful TV transmitter in Bulgaria with 50 kW. It broadcast the program of BNT 1 on channel 5 and could be received in Romania, Moldova and Ukraine. In 2008 due to interference with foreign FM radio stations the transmitter was shut down and broadcasting of BNT 1 was switched to channel 56 on a new NEC transmitter. The analogue transmitters were shut down on September 30, 2015, when simulcast period ended and Bulgaria switched to DVB-T.
Col de la Madone transmitter is a very large broadcasting centre operated by Radio Monte Carlo north of Fontbonne, near Nice and Monaco, in France. It was established in 1965 and was used until completion of Roumoules radio transmitter for longwave broadcasting, using 3 320 metres tall guyed mast radiators, which do not exist any more. It was used for broadcasting on 702 kHz and 1467 kHz. Both antennas consist of 2 guyed mast radiators insulated against ground. The masts of the antenna for 1467 kHz are 101 metres tall and oriented in North-South direction. The masts of the antenna for 702 kHz are oriented in East-West direction pointing towards Milan, as it is used for transmitting a radio program in Italian language toward Italy. The western mast of this antenna, which acts as reflector, has a height of 250 metres while the eastern mast which is the radiator is 215 metres taller. A bit souther, there is close to a military radar site a centre for FM-broadcasting and on Mount Angel there is a 146 metres tall partially guyed tower, which consists of a grounded lattice tower as basement and a guyed mast radiator insulated against ground as top. It was built in 1946 and first used for mediumwave broadcasting, but is today used for TV-broadcasting. Nearby there is also the shortwave transmitter of RMC with several dipole walls.
Flensburg-Jürgensby transmitter was the first transmitter of Flensburg, situated in Jürgensby district. It went in service in 1928 and used, at its beginning, a quadruple T-antenna which was spun between two 60 metres tall wood lattice towers. These were 80 metres apart. In 1934 the transmission power was increased from 0.5 kW to 3 kW.
Berlin-Köpenick transmitter was a transmission facility for broadcasting on medium wave, short wave, and VHF in Berlin-Köpenick, Germany, near the suburb of Uhlenhorst, after which it was occasionally named.
