DTH hsheueueh3huwjehe7wuejejeueieiwowiwu2iwk1.pptx

Satellite communication

1. Dth Direct to home

2. What is DTH ?

3. The reception of satellite programs with a personal dish in an individual home DTH does away with the need for local cabel operator and made the direct touch with broadcaster It is the transmitting of video and audio signals through satellite to home

4. History OF DTH

5. It was invented by sir ARTHURE CLARES CLARKE IN 1946 It was first proposed I INDIA in 1996 but not approved due to national security concerns Finally in 2000 DTH was apprved in INDIA In 1 st apiral 2000 DOORDHARSAN provide the INDIAs first DTH service

6. Main components of DTH Broadcasting centre Satellites Encoders Multiplexers Modulatos DTH receivers

7. working Uplink antena Broadcasting centre satellite Parabolic reflector SETtop Box & Television

8. UP Link Antenna They are large in size for providing accurate aiming and increase signal strength They pointed specific satellite and specific frequency transponder can receive

9. Satellite In DTH satellite have 32 transponder for ku band (10Ghz – 18 hz ) and 24 transponders for c band (4Ghz-8Ghz) The satellite transmit the signal to the earth in ku and c band frequency

10. Parabolic Reflector It receive the signals from satellite and fed to the LNBF (Low Noise Block Down convertor Fedhorn ) which works as reciever for the transmitted signal from satellite LNBF

11. Parabolic reflector working Axis symmetry focus

12. Low Noise Band Down convertor Fedhorn (LNBF) It receive the signal form ku band and down convert to radio frequency signal Amplify and remove the distortion of receive signals

13. Block diagram of DTH LNBF Down convertor amplifier Down convertor Channel selector TV Set Demodulator Filter Tuneable oscillator

14. Coaxial cabel It connects the LNBF and set up box Transmit the received signals to SET topBox to demodulate the signal

15. Set Top Box It was used to demodulate the received satellite signal to audio and video signals

16. Set top Box Block diagram Tunner Demodulator Dish antenna Amplifier Micro controller Decoder CAS system A v A--  audio signal V -- video signal

17. T unner Micro controller Decoder Demodulator It selects the channel range from 48 Mhz-840Mhz The selected channel was decoded and fed to decoder It control the process perform by each blocks It converts the signal into audio and video signals

18. M erits In urban area cabel tv are less but DTH serve well in bot urban and rural areas There is no third party involvement between customer and broad caster Since the signal has less distortion the quality of video and audio were good

19. DTH Operators in INDIA

20. Advancement in DTH Now a days in DTH operators using the DTH they providing the internet facilities and we can able to record the channel programs

21. THANK YOU