The document is a student's acknowledgment and report on their training at DDK Silchar. It thanks various people who helped and supported the student during their training, including the Chairman and HOD of their college, as well as managers and lecturers at DDK Silchar who provided guidance and assistance. It expresses gratitude to everyone who helped the student gain knowledge and confidence during the training period, including teachers, parents, and well-wishers. The student is thankful for the invaluable experience and lessons learned during their time at DDK Silchar.

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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 TRANSMITER
4.1 DESIGN OF TRANSMITTER 23
4.2 EXCITER 24

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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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