A presentation on Industrial training at ALL INDIA RADIO

1. ON
Nutan Colony, Bilaspur (C.G.)
Presented By :
Md. Aazam Ali
5th
sem, ET&T

2. • Radio is the transmission of signals by modulation of
electromagnetic waves with frequencies below those of
visible light.
• Radio is based on wireless communication or satellite
communication.
• In this era of technology due to need of wireless
communication, A national service was planned and
developed by the Prasar Bharati Broadcasting
Corporation of India.

3.  All India Radio(A.I.R.) ‘s Bilaspur station is situated at Nutan Colony, Sarkanda area.
It was first stabilized on 1st
May 1991. It covers the range of 85 km area. This station
contains 6 Kw Power amplifier for the Transmitter.
 The Government run broadcasting set up was called the India State Broadcasting
Service (ISBS) which is then turned into AIR (All India Radio) in June 1936.
 The introduction of the commercial channel ‘Vividh Bharti’ in October 1957 increased
the interest and popularity of radio.
 AIR today has a network of 232 broadcasting centres with 149 medium
frequency(MW), 54 high frequency (SW) and 171FM transmitters.
The coverage is 91.79% of the area serving 99.14% of the people.

4. 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.

5. 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
Broadcast Tower Radio

6. • Studio Centre
• Broadcast Studio
• Mixing
• Control Room

7. • Recording Room
• Dubbing Room
• Loud Speakers
• Headphones

11. • AC POWER SUPPLY
• DC POWER SUPPLY

12.  FM broadcasts were introduced in Madras in 1977 and later at Jalandhar in 1992,
but it was only in 1993 when slots came to be leased to private companies.
 On August 15, 1993 a Frequency Modulation (FM) Channel was launched in
Bombay, with nine hours of radio which slots was leased to private producers like
Times FM, radio star and Radio Midday.
 In FM Phase II some 338 frequencies were offered of which about 237 were sold.

13. Here is an example of both FM modulation
and AM modulation you can see from the
image that AM is much looser than the FM
signal meaning that less data can be sent at
one time as it isn’t compressed. The reason
for the difference in sound quality as a lower
bitrate must be sent across the wave.

14. 91.1 - Radio City
92.7 - Big FM
93.5 - S FM
94.3 – My FM
98.3 - Radio Mirchi
101.3 - FM Rainbow
102.9 - Vivdh Bharati
104 - Fever FM
105.6 - Gyaan Vaani

15. o This is only means which can provide multi access two way communication.
o The cost of transmitting information through satellite is independent of
distance involved.
o Satellite can be used for two way communication or broadcast purpose with
the covered area.
o Satellites are capable of handling very high bandwidth.
o It is possible to provide large coverage using satellite. For example
Geostationary satellite can cover about 42% of earth surface using global
beam.