SMATV: Difference between revisions
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Revision as of 09:54, 20 December 2016
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, hospitals and commercial properties with multiple tenants, schools. 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. Antenna with 2 m-3m diameter.
A SMATV headend is used to receive and rebroadcast Satellite TV channels throughout a property from a single satellite feed.[4]
The system consist of Master Antenna, matching transformer to match the balanced antenna with unbalanced cable and amplifiers.[5] Mostly antenna have impedance is around 300 ohm. To convert it to 75 ohm matching Transformer Balun is used. For trunk line isolation, a resistive inductive device known as splitter is used. It amplifier output is fed to splitter through coaxial trunk lines.[6]
There are several methods of distribution that is often used in a SMATV headend including:
- IPTV (Internet Protocol) TV Systems[7]
- Com1000 Pro:Idiom Encrypted HD Headend
- L-Band Satellite TV Distribution[8]
Two Main approaches for distribution of digital TV signal 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 utilized to provide the satellite TV signal for SMATV headend systems are:
References
- ^ 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.