DTH TECHNOLOGY

PRESENTED

BY P.SUDHAKAR

11rk1ao447 ECE

2

CONTENTS

Introduction History of DTH Main Components DTH Network lNBC Block diagram Settop box Advantages disadvantages Applications Conclusion References

WHAT IS DTH

DTH CAN BE DEFINED AS

HISTORY

MAIN PARAMETERS OF DTH BROAD COASTING CENTER

UP LINK ANTENNA

SATILLITE TRANPONDER

MINIDISH ANTENNA

DTH RECEIVER

DTH NETWORK

Up link antenna Up link satellite dishes are large in size, which

provides accurate aiming and increase signal strength.

They are pointed toward specific satellite and the specific frequency is used.

Satellite transponder A typically satellite can have 32 transponder for

Ku band, 24 transponder for C band

Ku band range :10 to 18 GHZ

C band range :4 to 8 GHZ

The satellite retransmitts the signal back to earth in Ku & C band frequency

MINIDISH ANTENNA It is a parabolic reflector it receives the signal

and fed to the LNBC

Which works a receiver for signal transmitted by satellite

Parabolic reflector

(60 t0 120 cm)

LNBC

SIGNAL RECEIVED BY MINIDISH

DTH RECEIVING

LOW NOISE BLOCK DOWN CONVERTER(LNBC)

It collect the signal from minidish

It receive the signal from ku band and convert radio frequency signal

BLOCK DIAGRAM OF DTH SYSTEM

Low noise amplifier

Down Converter

Amplifier

Down Converter

Tunable Local Oscillator

Filter

Demodulator

TV SET

Video baseband

Channel selector

Low noise block down converter

SET TOP BOX A set top box can be demodulate the received signal.

It can convert these signal into audio & video signal.

SET TOP BOX Block diagram

TUNER DEMODULATOR DECODER AMPLIFIER

MICROCONTROLLER

DISH ANTENNA

CAS SYSTEM

A

V

FUTURE PROSPECT OF DTH The DTH market in INDIA is relatively increasing day

by day and in next 5 years(by 2020) we will be add another 40 million subscriber.

In the next 5 years.. We have manage to overtake JAPAN as the largest DTH market in ASIA.

ADVANTAGES Cost effective communication

DTH services provides pure quality of video,audi0.

Easily design

Reliability

It can provide up to 4000 TV channels and 2000 radio channels

DTH is more resistive to the weather condition ,IF it can work any type of environment

DISADVANTAGES Packet and pricing

The service is interrupted in case at the direction dish is distributed.

DTH SERVICE PROVIDER

CONCLUSION