SMATV
SMATV is Single Master Antenna Television (or Satellite Master Antenna Television),[1] The purpose of SMATV is for supplying and controlling the number and type of channels to multiple televisions.[2] 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.[3] 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 2 metres (6.6 ft) to 3 metres (9.8 ft) in diameter.
A SMATV headend is used to receive and rebroadcast satellite television channels throughout a property from a single satellite feed.[4]
The system consists of a master antenna and a matching transformer to match the balanced antenna with unbalanced cable and amplifiers.[5] Most antennas have an impedance of around 300 Ω. To convert it to 75 Ω, a matching transformer (or 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 trunk lines.[6]
There are several methods of distribution that are often used in a SMATV headend. These include:
- IPTV (Internet Protocol) TV Systems[7]
- COM1000 Pro:Idiom Encrypted HD Headend
- L-Band Satellite TV Distribution[8]
There are two main approaches for distribution of digital TV signals in SMATV installations:
- Transmodulation from satellite quaternary phase shift keying QPSK to quadrature amplitude modulation QAM
- Direct distribution of QPSK[9]
In the United States, the satellite carriers providing the satellite TV signal for SMATV headend systems are:
References
[edit]- ^ EN 300 473: "Digital Video Broadcasting (DVB); Satellite Master Antenna Television (SMATV) distribution systems" (PDF). ISBN 2-7437-1655-X.
- ^ View Source vision and security: "Satellite Master Antenna Television System(S.M.A.T.V).
- ^ Dennis Roddy. Satellite Communications. pp. 569-. ISBN 978-0-07-007785-0. Retrieved 29 Nov 2014.
- ^ Frank Baylin; Steve Berkoff (August 1992). Wireless cable and SMATV. Baylin Publications. ISBN 978-0-917893-17-9. Retrieved 24 May 2013.
- ^ RG Gupta. Television Engineering and Video Systems. ISBN 0-07-058596-2. Retrieved 29 Nov 2014.
- ^ SK Bhattacharya. Electrical Engineering Drawing. ISBN 81-224-0855-9. Retrieved 29 Nov 2014.
- ^ Wendy Van den Broeck; J. Pierson (2008). Digital television in Europe. Asp / Vubpress / Upa. pp. 241–. ISBN 978-90-5487-541-3. Retrieved 24 May 2013.
- ^ Mark Long (1999). Digital Satellite Television Handbook. Newnes. pp. 165–. ISBN 978-0-7506-7171-2. Retrieved 24 May 2013.
- ^ EN 300 473 V1.1.2: "Digital Video Broadcasting (DVB); Satellite Master Antenna Television (SMATV) distribution systems" (PDF). ISBN 2-7437-1655-X.