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Zarya (antenna)
{{unreferenced, date=January 2010 A Zarya Antenna (Cyrillic: Заря) is a special type of directional mediumwave broadcasting antenna consisting of a long straight row of grounded lattice tower A lattice tower or truss tower is a freestanding vertical framework tower. This construction is widely used in transmission towers carrying high voltage electric power lines, in radio masts and towers (a self-radiating tower or as a support f ...s with a height of approximately 50 metres in a distance of 100 metres. These towers carry the antenna wire. Three types of Zarya antennas are used at most larger AM broadcasting facilities in the former Soviet Union. They use the same configuration but different length values, which are 1500, 2500 and 3500 metres. See also * ARRT-Antenna External links Приднестровский Радиоцентр в п.Маяк купила Россия (ФГУП РТРС) - Страница 4 Communications in Russia Radio in the Soviet Union< ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antenna (radio)
In radio engineering, an antenna or aerial is the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver. In transmission, a radio transmitter supplies an electric current to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves (radio waves). In reception, an antenna intercepts some of the power of a radio wave in order to produce an electric current at its terminals, that is applied to a receiver to be amplified. Antennas are essential components of all radio equipment. An antenna is an array of conductors ( elements), electrically connected to the receiver or transmitter. Antennas can be designed to transmit and receive radio waves in all horizontal directions equally ( omnidirectional antennas), or preferentially in a particular direction ( directional, or high-gain, or “beam” antennas). An antenna may include components not conn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lattice Tower
A lattice tower or truss tower is a freestanding vertical framework tower. This construction is widely used in transmission towers carrying high voltage electric power lines, in radio masts and towers (a self-radiating tower or as a support for aerials) and in observation towers. Its advantage is good shear strength at a much lower weight than a tower of solid construction would have as well as lower wind resistance. In structural engineering the term ''lattice tower'' is used for a freestanding structure, while a ''lattice mast'' is a guyed mast supported by guy lines. Lattices of triangular (3-sided) cross-section are most common, particularly in North America. Square (4-sided) lattices are also widely used and are most common in Eurasia. Lattice towers are often designed as either a space frame or a hyperboloid structure. Before 1940, they were used as radio transmission towers especially for short and medium wave. Occasionally lattice towers consisting of wood were uti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amplitude Modulation
Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave. In amplitude modulation, the amplitude (signal strength) of the wave is varied in proportion to that of the message signal, such as an audio signal. This technique contrasts with angle modulation, in which either the frequency of the carrier wave is varied, as in frequency modulation, or its phase, as in phase modulation. AM was the earliest modulation method used for transmitting audio in radio broadcasting. It was developed during the first quarter of the 20th century beginning with Roberto Landell de Moura and Reginald Fessenden's radiotelephone experiments in 1900. This original form of AM is sometimes called double-sideband amplitude modulation (DSBAM), because the standard method produces sidebands on either side of the carrier frequency. Single-sideband modulation uses bandpass filters to eliminate one of the sidebands a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ARRT-Antenna
An ARRT-Antenna (Cyrillic: АРРТ) is the designation of a common type used on many AM broadcasting sites in former Soviet Union, Bulgaria and Albania. It consists of a cage antenna which is mounted around the lower parts of a mast radiator insulated against ground and insulated from the mast. The mast and the cage antenna are fed separately. The ARRT-antenna allows a radiation pattern with less skywave radio propagation and is more easily realizeable than a mast divided by insulators. A variant of ARRT-antennas uses a grounded mast and a cage antenna reaching from the bottom to the top of the mast. Such antennas are used e.g. at the mediumwave masts of Bolshakovo transmitter. See also * Zarya Zarya may refer to: *Zorya, personification of dawn in Slavic mythology *Zarya (antenna), a type of medium-wave broadcasting antenna used in former Soviet Union *Zarya (ISS module) is a module of the International Space Station. * ''Zarya'' (magazin ... External links Pictures of a broa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Communications In Russia
Censorship and the issue of media freedom in Russia have been main themes since the era of the telegraph. Radio was a major new technology in the 1920s, when the Communists had recently come to power. Soviet authorities realized that the "ham" operator was highly individualistic and encouraged private initiative – too much so for the totalitarian regime. Criminal penalties were imposed but the working solution was to avoid broadcasting over the air. Instead radio programs were transmitted by copper wire, using a hub and spoke system, to loudspeakers in approved listening stations, such as the "Red" corner of a factory. Due to the enormous size of the country Russia today leads in the number of TV broadcast stations and repeaters. There were few channels in the Soviet time, but in the past two decades many new state-run and private-owned radio stations and TV channels appeared. The telecommunications system in Russia has undergone significant changes since the 1980s, resulting ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
