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Multiswitch
{{Unreferenced, date=December 2009 A multiswitch is a device used with a dual or quattro LNB to distribute satellite TV signals to multiple (usually more than four) receivers from a single dish and LNB. A typical Ku band universal LNB designed for the European market can be switched between four modes (two frequency ranges and two polarisations) selected by signals from the receiver (supply voltage for polarisation and presence or absence of a 22 kHz tone for frequency range). This means that each receiver needs a separate feed and twin-tuner receivers (such as Sky+ and Freesat+) need two separate feeds. For small numbers of receivers a multi-output LNB is used and all the feeds are taken straight from the LNB but there is a limit to the number of outputs that can reasonably be placed on a LNB. So for larger installations a quattro LNB is used in conjunction with a multiswitch. The quattro LNB provides the signals for all four of the modes at the same time. The multisw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Low-noise Block Converter
A low-noise block downconverter (LNB) is the receiving device mounted on satellite dishes used for satellite TV reception, which collects the radio waves from the dish and converts them to a signal which is sent through a cable to the receiver inside the building. Also called a low-noise block, low-noise converter (LNC), or even low-noise downconverter (LND),Bains, Geoff. "Getting The Most Out Of An LNB" ''What Satellite & Digital TV'' (November, 2008) pp50-51 the device is sometimes inaccurately called a ''low-noise amplifier'' (''LNA''). The LNB is a combination of low-noise amplifier, frequency mixer, local oscillator and intermediate frequency (IF) amplifier. It serves as the RF front end of the satellite receiver, receiving the microwave signal from the satellite collected by the dish, amplifying it, and downconverting the block of frequencies to a lower block of intermediate frequencies (IF). This downconversion allows the signal to be carried to the indoor satellite TV ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Low-noise Block Converter
A low-noise block downconverter (LNB) is the receiving device mounted on satellite dishes used for satellite TV reception, which collects the radio waves from the dish and converts them to a signal which is sent through a cable to the receiver inside the building. Also called a low-noise block, low-noise converter (LNC), or even low-noise downconverter (LND),Bains, Geoff. "Getting The Most Out Of An LNB" ''What Satellite & Digital TV'' (November, 2008) pp50-51 the device is sometimes inaccurately called a ''low-noise amplifier'' (''LNA''). The LNB is a combination of low-noise amplifier, frequency mixer, local oscillator and intermediate frequency (IF) amplifier. It serves as the RF front end of the satellite receiver, receiving the microwave signal from the satellite collected by the dish, amplifying it, and downconverting the block of frequencies to a lower block of intermediate frequencies (IF). This downconversion allows the signal to be carried to the indoor satellite TV ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Satellite TV
Satellite television is a service that delivers television programming to viewers by relaying it from a communications satellite orbiting the Earth directly to the viewer's location. The signals are received via an outdoor parabolic antenna commonly referred to as a satellite dish and a low-noise block downconverter. A satellite receiver then decodes the desired television program for viewing on a television set. Receivers can be external set-top boxes, or a built-in television tuner. Satellite television provides a wide range of channels and services. It is usually the only television available in many remote geographic areas without terrestrial television or cable television service. Modern systems signals are relayed from a communications satellite on the X band (8–12 GHz) or Ku band (12–18 GHz) frequencies requiring only a small dish less than a meter in diameter. The first satellite TV systems were an obsolete type now known as television receive-only. These s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Satellite Dish
A satellite dish is a dish-shaped type of parabolic antenna designed to receive or transmit information by radio waves to or from a communication satellite A communications satellite is an artificial satellite that relays and amplifies radio telecommunication signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth. C .... The term most commonly means a dish which receives direct-broadcast satellite television from a direct broadcast satellite in geostationary orbit. History Parabolic antennas referred to as "dish" antennas had been in use long before satellite television. The term ''satellite dish'' was coined in 1978 during the beginning of the satellite television industry, and came to refer to dish antennas that send and/or receive signals from communications satellites. Taylor Howard of San Andreas, California, adapted an ex-military dish in 1976 and became the first person to receive s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crossbar Switch
In electronics and telecommunications, a crossbar switch (cross-point switch, matrix switch) is a collection of switches arranged in a matrix configuration. A crossbar switch has multiple input and output lines that form a crossed pattern of interconnecting lines between which a connection may be established by closing a switch located at each intersection, the elements of the matrix. Originally, a crossbar switch consisted literally of crossing metal bars that provided the input and output paths. Later implementations achieved the same switching topology in solid-state electronics. The crossbar switch is one of the principal telephone exchange architectures, together with a rotary switch, memory switch, and a crossover switch. General properties A crossbar switch is an assembly of individual switches between a set of inputs and a set of outputs. The switches are arranged in a matrix. If the crossbar switch has M inputs and N outputs, then a crossbar has a matrix with ''M'' × ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kathrein EXR5016T Multiswitch
Kathrein-Werke KG is a German manufacturer of antenna systems and related electronics. The company was founded in Rosenheim (Upper Bavaria) in 1919 and is still headquartered there. It is the world's oldest and largest antenna manufacturer, valued at about $1.8 billion in 2015. The company is headed by the German billionaire Anton Kathrein Jr. who ascended to the CEO position in 2012 following the death of his father Anton Kathrein. Kathrein produces antennas for GSM and UMTS mobile radio towers and for various car manufacturers such as BMW. Most satellite receivers and satellite parabolic antennas for radio and television reception are developed and partly produced by Kathrein in Germany. Many radio and television antenna towers in Germany (the ones with red and white striped tips) are equipped with Kathrein antennas. The corresponding transmitters usually are supplied by Rohde & Schwarz. In February 2019 it became known that the core business with mobile phone antennas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sky+
The sky is an unobstructed view upward from the surface of the Earth. It includes the atmosphere of Earth, atmosphere and outer space. It may also be considered a place between the ground and outer space, thus distinct from outer space. In the field of astronomy, the sky is also called the celestial sphere. This is an abstract sphere, concentric objects, concentric to the Earth, on which the Sun, Moon, planets, and fixed stars, stars appear to be diurnal motion, drifting. The celestial sphere is conventionally divided into IAU designated constellations, designated areas called constellations. Usually, the term ''sky'' informally refers to a perspective from the Earth's surface; however, the meaning and usage can vary. An observer on the surface of the Earth can see a small part of the sky, which resembles a dome (sometimes called the ''sky bowl'') appearing flatter during the day than at night. In some cases, such as in discussing the weather, the sky refers to only the lower, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freesat+
Freesat+ is a consumer brand introduced to raise consumer awareness and promote sales of Freesat-capable digital TV recorders, otherwise known as personal video recorders. Freesat+ affords users similar features that are available with competitor services such as Sky+ and Freeview+. Background Freesat+ offers a PVR functionality for Freesat, which offers a greater choice of channels compared to Freeview, including a greater number of HD channels, without the subscriptions of Sky or Virgin Media. Freesat also offers higher rates of coverage than Freeview. Manufacturers Freesat do not manufacture the units itself, but will award the Freesat+ label to manufacturers that are able to meet a series of specifications that have been drawn up by the UK’s Digital TV Group. Many manufacturers provide Freesat+ set-top boxes such as: Humax, Manhattan, Bush, Sagemcom, Goodmans and others. See also * High-definition television in the United Kingdom High-definition television in the Uni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Integrated Reception System
An integrated reception system (IRS) provides broadcast signals from multiple sources (typically terrestrial television, FM radio, DAB digital radio and satellite TV Satellite television is a service that delivers television programming to viewers by relaying it from a communications satellite orbiting the Earth directly to the viewer's location. The signals are received via an outdoor parabolic antenna commo ...) to multiple outlets, via a single aerial cluster and signal booster-distributor. The most obvious use for such a system is in communal housing blocks, where one aerial cluster can replace many aerials serving individual dwellings (e.g. flats or apartments). The predecessor to IRS was MATV- master aerial television- which provided communal housing with terrestrial TV signals only. Because the booster-distributor boxes within such systems usually need replacing to cope with digital terrestrial TV signals, many landlords are opting to replace the entire system with IRS at ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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