1. Presented By: Rahul Gawande (0103EC071080)

2. INTRODUCTION  For 75 years, AIR has been distinctive part of the Indian way of life. With one of the largest network of SW/MW/FM transmitters, AIR, reaches the remotest corners of the country.  All India Radio (abbreviated as AIR), officially known as Akashvani is the radio broadcaster of India and a division of Prasar Bharati.

3.  Today AIR has a network of 213 broadcasting centers covering 90% of the area & almost reaching the entire population of one billion. All India Radio is one of the largest radio networks in the world. The headquarters is at the Akashwani Bhavan, New Delhi.  The External Services Division of All India Radio broadcasts in 27 languages to countries outside of India.

4. Stages Of a Radio Station  Studio  Control Room  Transmitter

5.  RECEIVING CENTRE  ANNOUNCER CONSOLE  EQUIPMENTS

6. Broadcast Studio  A broadcast studio is an acoustically treated room. It is necessary that the place where a programme for broadcast purposes is being produced should be free of extraneous noise. This is possible only if the area of room is insulated from outside sound.  The entry to the studios is generally through sound isolating lobby called sound lock. Outside of every studio entrance, there is a warning lamp, which glows Red when the studio is ON-AIR.

7. Studio Centre The Studio Centre comprises of one or more studios, recording and dubbing room, a control room and other ancillary rooms like battery room, a.c. rooms etc. The size of such a centre and the number of studios provided depend on the programme activities of the station. The Studio Centre comprises of one or more studios, recording and dubbing room, a control room and other ancillary rooms like battery room, a.c. rooms, switch gear room,DG room, R/C room, service room, waiting room, tape library, etc.

8. PC TURN TABLE MICRO PHONE PROGRAM AMPLIFIER TO CONTROL ROOM ANNOUNCER CONSOLE

9. Control Room  Mixing  Switching Transmitter  Amplifiers  Modulators  Antennas

10. Control Room Broad functions of switching console in control room:  Switching of different sources for transmission like News, O.Bs. other satellite based relays, live broadcast from recording studio.  Level equalization and level control.  Quality monitoring.  Signaling to the source location.  Communication link between control room and different studios

11. RNT SWITCHING CENTRE STUDIO SWITCHER MIXER PROGRAM AMPLIFIER

12. Mixing Various equipments are available in a studio to generate programme as given below:  Microphone, which normally provides a level of 70 dBm.  Turntable which provides an output of 0 dBm.  Tape decks which may provide a level of 0 dBm.  CD and R-DAT will also provide a level of 0 dBm.

14. AMPLIFIER  Audio Amplifiers  Power Amplifiers  Peak Clippers

16. Principle Of Antenna System  Antenna is usually a metallic device (a rod or a wire) used for radiating or receiving electromagnetic waves.  The radio frequency power developed in the final stage of a transmitter is delivered through cables/feeders, without themselves consuming any power to the transmitting antenna.