SMATV
SMATV (single master antenna television or satellite master antenna television),[1] is a system for supplying and controlling the number and type of communication channels, usually television channels and FM stations to multiple televisions.[2] 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 be distributed.
Design
[edit]It consists of single outdoor unit or antenna feeding multiple receivers.[3] Accessible channels can vary by user. Maintaining a high signal-to-noise ratio requires a larger antenna, typically 2–3 metres (6.6–9.8 ft) in diameter.
A single SMATV headend receives and retransmits satellite television channels throughout a property.[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 splitter is used. The amplifier output is fed to the splitter through coaxial trunk lines.[6]
Distribution
[edit]Several methods of distribution are supported via SMATV. These include:
- IPTV (Internet Protocol) TV Systems[7]
- COM1000 Pro:Idiom Encrypted HD Headend
- L-Band Satellite TV Distribution[8]
The two main approaches for distribution of digital TV signals in SMATV installations are:
- Transmodulation from satellite quaternary phase shift keying QPSK to quadrature amplitude modulation QAM
- Direct QPSK distribution[9]
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). Archived from the original on 2017-02-02. Retrieved 2014-11-29.
- ↑ 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.