Editing SMATV (section)

'''SMATV''' is Single Master Antenna Television (or Satellite Master Antenna Television),<ref name="ETSI"/>
The purpose of SMATV is for supplying and controlling the number and type of channels to multiple televisions.<ref name="VIS"/> Not only TV channels but [[FM broadcasting|FM]] channels as well. It provides Reception of [[Direct broadcast satellite|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.<ref name="SCDR"/> 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 {{Convert|2|m|ft}} to {{Convert|3|m|ft}} in diameter.

[[File:Fracarro-Portenseigne-Compact-Line-QPSK-Digital-Satellite-x6-Headend-SIG9506UN-Front.jpg|thumb|A QPSK Digital Satellite Headend by Fracarro.]]
A SMATV headend is used to receive and rebroadcast [[satellite television]] channels throughout a property from a single satellite feed.<ref name="BaylinBerkoff1992"/>

The system consists of a master antenna and a matching transformer to match the balanced antenna with unbalanced cable and amplifiers.<ref name="TEDR"/> Most antennas have an impedance of around 300&nbsp;Ω. To convert it to 75&nbsp;Ω, a matching transformer (or [[balun]]) is used. For trunk line isolation, a resistive inductive device known as a [[Power_dividers_and_directional_couplers|splitter]] is used. The amplifier output is fed to the splitter through [[coaxial]] trunk lines.<ref name="EED"/>

There are several methods of distribution that are often used in a SMATV headend. These include:
* [[IPTV]] ([[Internet Protocol]]) TV Systems<ref name="BroeckPierson2008"/>
* COM1000 Pro:Idiom Encrypted HD Headend
* [[L-Band]] Satellite TV Distribution<ref name="Long1999"/>
There are two main approaches for distribution of digital TV signals in SMATV installations:
* Transmodulation from satellite quaternary [[Phase-shift keying|phase shift keying]] [[QPSK]] to quadrature [[amplitude modulation]] [[Quadrature amplitude modulation|QAM]]
* Direct distribution of QPSK<ref name="ETSI2"/>

In the United States, the satellite carriers providing the satellite TV signal for SMATV headend systems are:
*[[DirecTV]]
*[[Dish Network]]