DTH (Direct to Home) technology involves transmitting satellite programming directly to small dish antennas at individual homes. It does not require a local cable operator and allows broadcasters to connect directly with consumers. DTH systems consist of an uplink antenna, satellite, minidish antenna, low noise block down converter, and set top box. DTH offers better picture quality than cable TV since the signal travels directly from satellite to user without passing through coaxial cables. DTH has expanded television access to both urban and rural areas in India.

1. WELCOME

2. ARYAN INSTITUTE OF TECHNOLOGYGHAZIABADSEMINARDTH

3. DTH can be defined as :

4. The reception of satellite programmers with a personal dish at individual home.

5. DTH does not require the local cable operator and put the broadcaster directly in touch with the consumer. WHAT IS DTHDTH Stand’s for Direct to home television .HISTORY

6. The first person who invented the technology for DTH was sir ARTHURE CLARLES CLARKE , a british inventor in late 1946.

7. The DTH service was first proposed in INDIA in 1996 , but was not approved due to concern over national security.

8. Finally , 2000 DTH service was allowded and Doordarshan was first to To provide the service to the consumers from 1st of April ,2000.

9. After this other DTH service provider like ZEE and STAR starded pushing hard for DTH service in INDIA and setup earth station whose cost was 2.15 million and was valid for 10 years in INDIA. MAIN PARAMETER OF DTH

10. DTH network consist of

11. Broadcasting center .

12. Satellite encodes.

13. Multiplexer.

14. Modulator.

15. DTH receiver.DTH NETWORKUPLINK ANTENNA

16. Uplink satellite dishes are large in size which provides accurate aiming and increase signal strength

17. The y are pointed toward specific satellite and the frequency used is specific so that satellite transponder can receive the signal. The EIRP (Effective isotropically radiated power) for the uplink antenna EIRP = Pt – Lc + GaWhere Pt = Power of transmitter (dbm)Lc = Line loss(db)Ga = Gain of antenna(dbi)

18. SATELLITE

19. A typical satellite can have 32 transponder for Ku band (10 Ghz to 18 Ghz) and 24 transponder for C band( 4 Ghz to 8 Ghz).

20. A typical transponder can have bandwidth between 27 Mhz to 50 Mhz.

21. The satellite retransmits the signal back to earth in Ku band and C band frequency.MINIDISH ANTENNA

22. It is parabolic reflector it receives the signal and fed to the LNBF(low noise band down converter) ,which works as a receiver for signal transmitted by satellite.LNBFParabolic reflector( 60 to 120 cm )

23. SIGNAL RECEIVED BY MINIDISHLOW NOISE BLOCK DOWN CONVERTER(LNBF)

24. It collect the signal from minidish.

25. It receive the signal from Ku band and down convert to radio frequency signal.

26. It amplify and remove the distortion from the received signal. BLOCK DIAGRAM OF DTH SYSTEMLow noise block down converterAmplifier Down Converter Filter Low noise amplifierDown Converter Video baseband Demodulator Tunable Local Oscillator Channel selector TV SET