Date post: | 11-Apr-2017 |
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A Training Presentation
onAll India Radio(Bhopal)
Presented to: Dr. D.K GANGWAR H.O.D (ECE)
Presented by: Niwas kumas EC 7th sem
CONTENTS Introduction
Principle of All India RadioStudioPhone in program consoleControl RoomTransmitterAntennaSatellite role in AIRSummary
INTRODUCTION
• Radio is the transmission of signals by modulation of electromagnetic waves with frequencies 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.
Frequency used:S.W .Transmitter– 7180 KHZ & 8410 KHZ (41m)
M.W . Transmitter– 1593 KHZ (60m)F.M. Transmitter – 103.5 MHZ (188.32m)
PRINCIPLE OF AIR
TransmittingA 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.
ReceivingAn 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
STUDIO
There are following studio in AIR BHOPAL: --_ 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 Bharati 5. PLAYBACK STUDIO: For announcing and playback of songs and records. 6. DUBBTNG STUDIO: dubbing and editing of tapes.
PHONE IN PROGRAM CONSOLE
BLOCK DIAGRAM OF STUDIO
SWITCHER
CONTROL ROOM
PLAY BACK STUDIO
MUSIC STUDIO
TALK STUDIO
DUBBING/EDITING ROOM
CONTROL ROOM
SERVER
Control Room Audio Console Inputs and Outputs
CONTROL ROOM AUDIO
CONSOLE
BHOPAL(C-BAND DISH OUTPUT)
TALK STUDIO
MUSIC STUDIO
BSNL LINK TO OTHER
STATIONS
MASTER AMPLIFIER 1
OR 2PLAYBACK
STUDIOSTUDIO
TRANSMITTER LINK
AM TRANSMITTER
FM TRANSMITTER
TRANSMITTER
AM TRANSMITTER:- These transmitter are used to transmit the medium wave(MW) and short wave(SW).
The MW band has frequency between 550 KHz to 1650 KHz and SW band has frequency ranging from 3 MHz to 30 MHz
There is too much over-crowding in the AM broadcast bands and shrinkage in the night-time service due to fading, interference ,etc.
There are two types of AM transmitter that are used based on the their transmitting power are:-
1.High Level2.Low level
FM TRANSMITTER:- FM broadcasting offers several advantage over AM such as uniform day and night coverage, good quality listening and suppression of noise, interference.
All India Radio has gone in for FM broadcasting using Modern FM Transmitter .
The configuration of the transmitter being used in the network are:-
3 kW Transmitter
2*3 kW Transmitter
5 kW Transmitter
2*5 kW Transmitter
TRANSMITTER
FM transmitter AM transmitter
Block Diagram of Transmitter
Common Devices of FM transmitter and AM transmitter
• Exciter
• RF switch
• VHF amplifiers
• Adapter plug in unit
• Power distribution panel
• Combining and Monitoring panel
• Reject load
• Dummy load
ANTENNAAn antenna or aerial, is an electrical device which converts electric power into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver , In transmission, a radio transmitter supplies an electric current oscillating at radio frequency (i.e. a high frequency alternating current (AC)) to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves(radio waves). In reception, an antenna intercepts some of the power of an electromagnetic wave in order to produce a tiny voltage at its terminals, that is applied to a receiver to be amplified.
ROLE OF SATELLITE IN AIR•Satellite communication is the outcome of desire of the man to achieve the global village.
•Satellites are mainly used during broadcasting of vividh Bharati program from Mumbai with the help of up-linking and down-linking process.
SUMMARY
QUERIES…….
THANK YOU