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APRACTICAL TRAINING PRESENTATION

ON

ALL INDIA RADIO(JODHPUR)

Submitted to :Ms.Laxmi Choudhary

(Training seminar coordinator)

Presented By :Mohammad Arshad

Electronics & Communication

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CONTENTS

Introduction

History and present scenario

Principal of All India Radio

THREE TIRE BROADCASTING SYSTEM

Transmitter

Studio

Console

Phone in Program console

Conclusion

INTRODUCTION TO A.I.R

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A.I.R is one of the largest radio networks in

the world.

A national service planned, developed and

operated by the Prasar Bharati Broadcasting

Corporation of India

All India Radio, Jodhpur was established at

15th August,1965.

The Satellite Earth station was established at

21st March,1944.

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To uphold the unity and integrity of the country and the

values enshrined in the Constitution.

Present a fair and balanced flow of information of national,

regional, local and international interest, including contrasting

views, without advocating any opinion or ideology of its own.

Produce and transit varied programs designed to awaken,

inform, educate, entertain and enrich all sections of the

people.

OBJECTIVE

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HISTORY AND PRESENT SCENERIO

In 1926 the private Indian Broadcasting Company (IBC) was

granted permission to operate two radio stations; the Bombay

station was inaugurated on July 23, 1927, the Calcutta station

followed on August 26, 1927.

The introduction of the commercial channel ‘Vividh Bharti’ in

October 1957 increased the interest and popularity of radio.

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AIR today has a network of 237 broadcasting centers with 149

medium frequency (MW), 54 high frequency (SW) and 177 FM

transmitters.

The coverage is 91.85% of the area , serving 99.18% of the

people in the largest democracy of the world.

AIR covers 24 Languages and 146 dialects in home services.

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Principles Of All India Radio

*Transmitting

*A radio wave carries information signal;

Signals are converted into electrical

signals. A carrier wave is then produced

from the modulation. The wave is then

amplified, and sent to the antenna that

then converts signal into an E.M. wave.

*Receiving

*An antenna on receiving the signal send it

to the receiver this then converts the

electrical signal sends it to the amplifier

either a speaker/headphones jack this is

then converted into a sound wave.

• Modulation• Amplification

Transmission

• Demodulation• Amplification

Reception

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Antenna is usually a metallic device (as a rod or a wire) used for radiating or receiving electromagnetic waves.

Transmission - radiates electromagnetic energy into space

Reception - collects electromagnetic energy from space

In two-way communication, the same antenna can be used for transmission and reception

Antenna Introduction

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Types of Antennas

Isotropic antenna (idealized)

Radiates power equally in all directions

Dipole antennas

Half-wave dipole antenna (or Hertz antenna)

Quarter-wave vertical antenna (or Marconi antenna)

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Types of Antennas

Yagi uda

Phased arrays

Vertical or Horizontal

Horns for super ultra high frequencies

Mobile antennas

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Antenna Array

Consist of multiple antennas collaborating to synthesize radiation characteristics not available with a single antenna. They are able

to match the radiation pattern to the desired coverage area.

to change the radiation pattern electronically through the control of the phase and the amplitude of the signal fed to each element.

to adapt to changing signal conditions.

to increase transmission capacity by better use of the radio resources and reducing interference.

.

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Antenna Array

27 antennas along 3 railroad tracks provide baselines up to 35 km. Radio images are formed by correlating the signals garnered by each antenna.

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Advantages of Antenna Array

Possibilities to control electronically

Direction of maximum radiation

Directions (positions) of nulls

Beam-width

Directivity

Levels of side lobes

Using standard antennas (or antenna collections) independently of their radiation patterns.

Antenna elements can be distributed along straight lines, arcs, squares, circles, etc.

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KEY LEARNINGS

Important concepts of communication.

Resource management.

Discipline.

Development of a practical point of view towards

the work.

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THREE-TIER BROADCASTING SYSTEM

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There are following studio in AIR JODHPUR: --_

1. DRAMA STUDIO: Recording of Drama, discussion, chat, phone in Program.

2 TALK STUDIO: For live program like talk and rural programs.

3. MUSIC STUDIO: Recording of musical programs and concerts.

4. CBS: Purely dedicated to commercial broadcasting service of Vividh Bharti

5. PLAYBACK STUDIO: For announcing and playback of songs and records.

6. DUBBING STUDIO: dubbing and editing of tapes.

STUDIO

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CONSOLE

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SYSTEM FACILITIES

A. Interface with telephone line

B. Interface with telephone equipment

C. Optional facility for headset if required

D. Optional facility for direct broadcast on air using

headset/handset lf required.

FEATURES

1. Conversion with the remote participant in the live program.

2. Feed responses from the expert in the studio to the listeners

through telephone line.

3. Facilitate live broadcast of both the listen enquiry and expert's

responses.

4. Provide music on hold

5. Provide signaling facilities for indicating incoming calls.

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CONCLUSION

It was a wonderful experience , training in A.I.R.

There is great scope for engineers in the field of

communication.

Exposure to practical working conditions will be beneficial

for our career.

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QUERIES ???(if any..)

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Thank u…