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, hospitals and commercial properties with multiple tenants, schools.Using a master antenna system video signals, audio signals, 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 around 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:
- DIRECTV
- Dish Network Smatv
References
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