All India Radio Training Gwalior
All India Radio Training Gwalior
All India Radio Training Gwalior
PRESENTATION ON
INDUSTRIAL TRAINING
MOHIT MAKHIJA
BETN1EC11083
Introduction to AIR
Principle of AIR
Transmitting
Modulation
Amplification
Reception
Demodulation
Amplification
Transmission
Methodology of Radio
How radio electromagnetic waves are changed to Radio
Waves The sound wave is equivalent to a pressure wave.
Modulating
signal
Microphone
Carrier
Wave
Modulated Wave
ROOM s in AIR
Studio Centre
Broadcast Studio
Mixing
Control Room
Broadcasting chain:
Studio Centre
A studio is a room in studio complex which has been
Broadcast Studio
A broadcast studio is an acoustically treated room. It is
Mixing
The level from microphone is quite low and need to be
Mixer
Amplifier
Amplifier
Mixer
Control room
For two or more studios set up, there would be a provision for
used in AIR.
Pre-Amplifier
Pre-amplifier is the first amplifier in the broadcast
chain. The output from a microphone which is at
very low level is fed to its input.
The amplified signals obtained from this amplifier
are given to the program amplifier through a
mixing console.
The normal gain of this amplifier is about 50 dB.
In some pre -amplifiers a variable gain between 40
to 50 dB is provided.
A special feature of this amplifier is that the noise
contributed by this is very low.
Program Amplifier
Program
Monitoring Amplifier
The output available from the program amplifier is
Transmitter
AIR has its tranmitter located at Rairu (18 km from
GWL)
All India Radio uses various MW transmitters in
its network. They are from 1 kW to 500 kW power.
Various power and make of transmitters used are:
1. 1 kW MW Transmtiter BEL, Harris, BE
2. 10 kW/20 kW Transmitter BEL, Harris
3. 100/200 kW BEL HMB 140.
4. 100 kW Thales (Fully Solid state)
5. 200 kW/300 kW Thales (Fully Solid State)
6. 300 kW BBC Tube Version.
7. 500 kW BBC/Russian Transmitter.