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SMATV is Single Master Antenna Television (or Satellite Master Antenna Television),
The purpose of SMATV is for supplying and controlling the number and type of channels to multiple televisions. Not only TV channels but FM channels as well. It provides Reception of DBS TV/FM channels for hotels, motels, dormitories, schools, hospitals and commercial properties with multiple tenants. Using a master antenna system video signals, audio signals and decoder signals can also be distributed.
It consists of single outdoor unit or antenna feeding to number of indoor units. The channels accessible are independent of other users. For maintaining a good signal-to-noise ratio at all the indoor units served, a larger antenna is required, typically to in diameter.
A SMATV headend is used to receive and rebroadcast
A SMATV headend is used to receive and rebroadcast satellite television
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 comm ...
channels throughout a property from a single satellite feed.
The system consists of a master antenna and a matching transformer to match the balanced antenna with unbalanced cable and amplifiers. Most antennas have an impedance of around 300 Ω. To convert it to 75 Ω, a matching transformer (or balun
A balun (from "balanced to unbalanced", originally, but now dated from "balancing unit") is an electrical device that allows balanced and unbalanced lines to be interfaced without disturbing the impedance arrangement of either line. A balun ...
) is used. For trunk line isolation, a resistive inductive device known as a splitter is used. The amplifier output is fed to the splitter through coaxial
In geometry, coaxial means that several three-dimensional linear or planar forms share a common axis. The two-dimensional analog is ''concentric''.
Common examples:
A coaxial cable is a three-dimensional linear structure. It has a wire condu ...
trunk lines.
There are several methods of distribution that are often used in a SMATV headend. These include:
* IPTV
Internet Protocol television (IPTV) is the delivery of television content over Internet Protocol (IP) networks. This is in contrast to delivery through traditional terrestrial, satellite, and cable television formats. Unlike downloaded med ...
(Internet Protocol
The Internet Protocol (IP) is the network layer communications protocol in the Internet protocol suite for relaying datagrams across network boundaries. Its routing function enables internetworking, and essentially establishes the Internet.
...
) TV Systems
* COM1000 Pro:Idiom Encrypted HD Headend
* L-Band
The L band is the Institute of Electrical and Electronics Engineers (IEEE) designation for the range of frequencies in the radio spectrum from 1 to 2 gigahertz (GHz). This is at the top end of the ultra high frequency (UHF) band, at the lower ...
Satellite TV Distribution
There are two main approaches for distribution of digital TV signals in SMATV installations:
* Transmodulation from satellite quaternary phase shift keying QPSK
Phase-shift keying (PSK) is a digital modulation process which conveys data by changing (modulating) the phase of a constant frequency reference signal (the carrier wave). The modulation is accomplished by varying the sine and cosine inputs at ...
to quadrature amplitude modulation QAM
Quadrature amplitude modulation (QAM) is the name of a family of digital modulation methods and a related family of analog modulation methods widely used in modern telecommunications to transmit information. It conveys two analog message signa ...
* Direct distribution of QPSK
In the United States, the satellite carriers providing the satellite TV signal for SMATV headend systems are:
*DirecTV
DirecTV (trademarked as DIRECTV) is an American multichannel video programming distributor based in El Segundo, California. Originally launched on June 17, 1994, its primary service is a digital satellite service serving the United States. I ...
* Dish Networkbr>SmatvReferences
{{reflist, refs= {{cite book, title=EN 300 473: "Digital Video Broadcasting (DVB); Satellite Master Antenna Television (SMATV) distribution systems", url=http://www.etsi.org/deliver/etsi_en/300400_300499/300473/01.01.02_60/en_300473v010102p.pdf, isbn=2-7437-1655-X {{cite book, title=View Source vision and security: "Satellite Master Antenna Television System(S.M.A.T.V), url=http://www.viewsecure.co.uk/smatv.php {{cite book, author1=Dennis Roddy, title=Satellite Communications, url=https://books.google.com/books?id=_Ef0N-ExWucC, accessdate=29 Nov 2014, isbn=978-0-07-007785-0, pages=569- {{cite book, author1=Frank Baylin, author2=Steve Berkoff, title=Wireless cable and SMATV, url=https://books.google.com/books?id=xHfyAAAAMAAJ, accessdate=24 May 2013, date=August 1992, publisher=Baylin Publications, isbn=978-0-917893-17-9 {{cite book, author1=RG Gupta, title=Television Engineering and Video Systems, url=https://books.google.com/books?id=P6BlcWaizHUC&pg=PT490, accessdate=29 Nov 2014, isbn=0-07-058596-2 {{cite book, author1=SK Bhattacharya, title=Electrical Engineering Drawing, url=https://books.google.com/books?id=gdsSXU4uF-MC&pg=PA239, accessdate=29 Nov 2014, isbn=81-224-0855-9 {{cite book, author1=Wendy Van den Broeck, author2=J. Pierson, title=Digital television in Europe, url=https://books.google.com/books?id=oc2HL71I7EgC&pg=PA241, accessdate=24 May 2013, year=2008, publisher=Asp / Vubpress / Upa, isbn=978-90-5487-541-3, pages=241– {{cite book, author=Mark Long, title=Digital Satellite Television Handbook, url=https://books.google.com/books?id=L4yQ0iztvQEC&pg=PA165, accessdate=24 May 2013, year=1999, publisher=Newnes, isbn=978-0-7506-7171-2, pages=165– {{cite book, title=EN 300 473 V1.1.2: "Digital Video Broadcasting (DVB); Satellite Master Antenna Television (SMATV) distribution systems", url=http://www.etsi.org/deliver/etsi_en/300400_300499/300473/01.01.02_60/en_300473v010102p.pdf, isbn=2-7437-1655-X Satellite television