ACKNOWLEDGMENT

It is the euphoria of my life, when a moment comes and word become insufficient to express

the actual feelings in my heart. It almost impossible to illuminating guidance of God from this

particular point only could I harvest the vital element of struggle for a better life in the best

possible way.

Firstly I would like to convey my sincere thanks and gratitude to our respectable Prof. (Dr.)

Shakti Kumar,(Chairman, B.O.G of ISTK), Er. Parvinder Bhalla, (H.O.D. of Electronic &

communication) and Er. Sonam Gupta (Training coordinator).

Before presenting the report , I want to offer my heart felt thank and gratitude to Er. Somorjit

Singha ( Head of transmitting department and guide Lecturer of DDK Silchar ) for proving

us to all possible help and express my extreme gratitude to the Er. R.K. Aditya ( Head of

Receiver department and guide Lecturer DDK Silchar ) for arranging our training in this

organization.

I like to thank MR. J. KRISHNA RAO (Deputy Director , Engg) from the

core of my heart and I like to thank those who help directly or indirectly co- operate , guide and

helped me in gaining confidence during my training period.

Lastly I am thankful to entire person who helped gaining knowledge about the

organization my teacher’s , my parents , my all well-wishers for their blessing, inspiration.

Md. Siraj Uddin Ahmed

3311208

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LIST OF FIGURES

FIGURES PAGE NO

Fig. 2.1 Additive colour mixing 5

Fig. 2.2 Colour TV system. 6

Fig 2.3 Diagram of vision mixer. 8

Fig. 2.4 One line display of TV signal. 9

Fig. 2.5 Block diagram of PAL Encoder. 10

Fig. 3.1 Diagram of CCU. 14

Fig. 3.2 Diagram of Video tape recorder. 16

Fig. 3.3 Block diagram of video chain. 18

Fig. 3.4 CCD Camera.

20

Fig. 3.5 Block diagram of Typical Camera. 21

Fig. 3.6 Block diagram of Optical part of 3CCD. 21

Fig. 3.7 Block diagram of electronics part of 3CCD. 22

Fig.4.1 Block diagram of PCN-1610SSPH/1 VHF TV Transmitter. 23

Fig. 4.2 Diagram of Exciter. 24

Fig.4.3 Block diagram Transmitter. 26

Fig.4.4 Block diagram of Video Processor. 28

Fig.4.5 Block diagram of Vision Modulator. 29

Fig.4.6 Block diagram of VSBF Mixer. 30

Fig.4.7 Block diagram of Local Oscillator. 31

Fig.4.8 Block diagram of AURAL Modulator. 31

Fig.4.9 NLE Software. 34

Fig. 4.10 Doordarshan logo

35

Fig.4.11 Block diagram of Earth Station DDK Silchar. 38

Fig.4.12 Block diagram of Earth Station DDK Silchar. 39

Fig.4.13 Diagram of Parabolic Dish Antenna. 40

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LIST OF TABLES

TABLES PAGE NO

TABLE-1.1 STELLITE UPLINKING AND DOWNLINKING FREQUENCIES 2

TABLE-1.2 TERRESTRIAL TELEVISION (BAND-I) 2

TABLE-1.3 TERRESTRIAL TELEVISION (BAND-II) 3

TABLE-4.12 SPECIFFICATION OF DOORDARSHAN 37

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LIST OF CONTENTS

CONTENTS PAGE NO.

CHAPTER-1

INTRODUCTION TO DOORDARSHAN

1.1 INTRODUCTION 1

1.2 SATELLITE UPLINKING AND DOWNLINKING FREQUENCIES 2

1.3 TERRESTRIAL TELEVISION 2

CHAPTER-2

FUNDAMENTAL OF MONOCROME AND COLOR TV SYSTEM

2.1 PICTURE FORMATION 4

2.2 THE PAL COLOUR TELEVISION SYSTEM 5

2.3 THE COLOUR TELEVISION 6

2.4 COLOUR DIFFERENCE SIGNAL 7

2.5 VISION MIXING 8

2.6 VISION MIXER (OR VIDEO SWITCHER) 8

2.7 PAL ENCODER

10

CHAPTER-3

VIDEO CHAIN IN A TYPICAL DOORDARSHAN STUDIO

3.1 STUDIO CENTRE 11

3.2 PAL PHASE INDENT PULSES 14

3.3 VIDEO CHAIN 17

3.4 TV LIGHTING 18

3.5 TV CAMERA

19

CHAPTER-4

HIGH POWER TV TRANSMITERiv

4.1 DESIGN OF TRANSMITTER 23

4.2 EXCITER 24

4.3 AMPLIFIRE 25

4.4 SOLID STAGE POWER AMLIFIERS 25

4.5 TRANSMITTER SECTION 26

4.6 TRANSMITTER CONTTROL SYSTEM 27

4.7 VSBF AND MIXER 29

4.8 AUDIO CHAIN 31

4.9 AUDIO AMPLIFIER 32

4.10 EDITING 32

4.11 TRANSMITTER ANTENNA SYSTEM 35

4.12 DIGITAL SIDE BAND TRANSMISSION 36

4.13 EARTHSTATION 37

4.14 ANTENNA ARRAYS 40

REFERENCES 41

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