WELCOME

WAR IN THE SKY

DTHTECHNOLOGY

A SEMINAR BY -RAKESH KUMAR SINGH

REG.- 0801215006

CONTENTS

COMPONENTS

INTRODUCTION

WORKING OF DTH

UPLINK ANTENNA

SATELLITE

SETTOP BOX

DTH Vs CABLE TV

CONCLUSION

WHAT IS DTH

DTH Stand’s for Direct to home television .

DTH can be defined as :

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

DTH does not require the local cable operator and put the broadcaster directly in

touch with the consumer.

HISTORYThe first person who invented the technology for DTH

was sir ARTHURE CLARLES CLARKE , a British inventor in late 1946.

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

After this other DTH service provider like ZEE and STAR started 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

DTH network consist of:-

Broadcasting center .

Satellite encoders.

Multiplexer.

Modulator.

DTH receiver.

WORKING OF DTH

UPLINK ANTENNAUplink satellite dishes are large in size which provides accurate aiming and increase signal strength .

They are pointed toward specific satellite and the frequency used is specific so that satellite transponder can receive the signal.

SATELLITEA 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).

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

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

MINIDISH ANTENNA It is parabolic reflector it receives the signal and fed to the LNB(low noise block down converter) ,which works as a receiver for signal transmitted by satellite.

Parabolic reflector( 45 to 60 cm )

LNB

SIGNAL RECEIVED BY MINIDISH

LOW NOISE BLOCK DOWN CONVERTER(LNB)

It collect the signal from minidish.

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

It amplify and remove the distortion from the received signal.

COAXIAL CABLE The coaxial cable connect LNB to set top box.A transmission cable consist of outer metal conductor enclosing and insulated from a central conducting core.

A set-top box can demodulate the received signal and can convert these signal into audio and video signal.

SETTOP BOX

TUNER DEMODULATOR DECODER AMPLIFIER

MICROCONTROLLER

DISH ANTENNA

A

V

CAS SYSTEM

SET TOP BOX GENERAL BLOCK DIAGRAM OF SETTOP

BOX

TUNNERIt select particular channel range from 48 Mhz

to 840 Mhz

DEMODULATORSelected channel demodulated and fed to decoder

DECODERIt is a D to A converter which provide audio and

video signal as output.

MICROCONTROLLERIt control all the process performed by each

block.

DTH Vs CABLE TV

Dish network features, HD, Dolby 5.1ch, CD sound, superior picture quality with huge nos of Channel access.

Dish tv has remote geographical access with limited installations.

Special features-multi recording/live pause, play games , study aids for children, language ,learn cooking, news, mobile recharge, radio, home tutorial packages, with movies on demand.

Average Accessed quality of sound and picture, Limited numbers of channels accessed.

Cable for subscriber is a limited to wire but major to the supplier with huge installation.

Cable TV had manual access with least features but with Cable modem net.

Dish TV --- Cable TV

FUTUTRE PROSPECT OF DTHThe DTH market in INDIA is

relatively increasing day by day and in next 3 years (by 2014 ) we will be able to add another 30 million subscriber.

In the next 3 years ..,we have manage to overtake JAPAN as the largest DTH market in ASIA.

DTH SERVICE PROVIDER

CONCLUSION DTH has made the hopes for people of the rural area to come true.It help to develop the economy condition of our country.

It provide the wide thinking of rural people which helps to develop the culture of society.

The DTH market in INDIA is relatively increasing day-by-day. In the next 3 years by (2014-15) DTH subscribers will increase by 30 million subscribers.

ANYQUERIES