Presented By :
Nitin Vashistha

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All India Radio “Prasaar Bharti”
 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.
 AIR today has a network of 232 broadcasting centers.
 In External services, it covers 27 languages
HISTORY
 The first license granted for transmitting a broadcast was given on February 23, 1922. The Radio Club of Calcutta was the first radio club to start functioning in Nov-1924
 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
PRINCIPLE OF AIR
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
Studio Chain in Air Station
 Studio Centre
 Broadcast Studio
 Mixing
 Control Room
Facilities in AIR Studio
 Recording Room
 Dubbing Room
 Loud Speakers
 Headphones
Satellite Communication
ADVANTAGES
• This is only means which can provide multi access two way communication.
• The cost of transmitting information through satellite is independent of distance.
• Satellite can be used for two way communication or broadcast purpose with the covered area.
• Satellites are capable of handling very high bandwidth.
• It is possible to provide large coverage using satellite. For example geostationary satellite can cover about 42% of earth surface using global beam.
Antenna System
 Antenna is usually a metallic device (a rod or a wire) used for radiating or receiving electromagnetic waves.
 The receiving antenna picks up the radio waves and delivers .
 The transmitting and receiving antennae are reciprocal in the sense, any characteristics of the antenna in general applies equally to both.
Studio Transmitter Link FRONT VIEW
Power Supply System
 AC Power Supply
 DC Power Supply