air (3)
TRANSCRIPT
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VOCATIONAL TRAINING ON A.I.R
PRESENTED BY :RAJEEB AUDDYAVISHEK DAS
SUDIPTA RANJAN PALIT
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Basic Programme Chain at ALL INDIA RADIO
STUDIO
OUTSIDE
C-BandUPLINK
S-BandUPLINK
S-BandDownlink
EQA
CONTROLROOM
DTH Downlink
AUDIO SELECTOR SWITCHPROG INPUT RACK(TR HALL)
EARTHSTATION
P&T Line
DTH
C-B
and D’LIN
K
S-Band D
’LINK
DIG
TAL LIN
K
MW
LINK
FM LIN
K
DTHUplink
C-BandDownlink
LIMITER TRANSMITTER
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Source of Programmes
Internal: Studio BroadcastingExternal : Outside Broadcasting
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AUDIOSOURCE
(CONTROL ROOM)
Internal:a) Studiosb) Linkedc) NEWS
External:a) Live eventb) Sports event
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Categories of station• Transmitter + Studio ( Co-sited)
( FM Station)• Transmitter + Studio ( Non Co-sited)
( FM & AM Station)• Transmitter
( Relay Centre , HPT , SPT)
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CONTROL
ROOM
Satellite Uplink EARTH STATION
SB
andC
B
and
C BandUplink Terminal
S BandUplink Terminal
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Downlink Frequency
Frequency range (Down link)
• (i) S-Band = 2.5 to 2.7 GHz
• (ii) C-Band = 3.7 to 4.2 GHz
• (iii) Ex-C Band= 4.5 to 4.8 GHz
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Uplink Frequency
(i) Uplink freq. for S-Band
=Down link freq. + 3300 MHz (ii) Uplink freq. for C-Band/
=Down link freq. + 2225 MHz
(iii) Ex. C Band
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C - BandUplink Terminal
C - BandDownlink Terminal
(DTH Uplink Station)
DTH Uplink Terminal(Ku-Band)
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Important Audio Parameter
Frequency ResponseSignal to Noise Ratio (SNR)
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S – BandUplink
C – BandUplink
Ku – BandUplink(DTH)
S – BandDownlink
C – BandDownlink
Ku – BandDownlink(DTH STB)
AUDIO SELECTOR SWITCH(PROG INPUT RACK AT TR HALL)
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AUDIOINPUT
SELECTOR SWITCH
PROGINPUT RACK
(at TR HALL)P & T Line
FM Link
Satellite Downlinks
E1 Connectivity ( Limited )
Digital Link
STL Link (Microwave)
DTH Downlinks
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AUDIO SELECTOR SWITCH(PROG INPUT RACK AT TR HALL)
EQUALISED LINE AMPLIFIER
LIMTING AMPLIFIER
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EQAAUDIO SELECTOR SWITCHPROG INPUT RACK(TR HALL) LIMITER
TRANSMITTER
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TRANSMITTER RECEIVER
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What is the basic recognition of a Radio Transmitter?
It’s
Carrier Frequency
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What is the power of a Radio Transmitter?
It’s
Rated Carrier Power
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What are the basic types of Modulation?
• Amplitude Modulation
• Frequency Modulation
• Digital Modulation
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An audio signal (top) may be carried by an AM or FM radio wave.
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What are the basic type of Radio Transmitter?• AM Transmitter
• FM Transmitter
• Digital Transmitter
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What are the basic type of AM Transmitter?
• 10 kW• 2 X 10 kW• 100 kW• 2 X 100 kW • 300 kW • 2 X 500 kW
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What are the basic types of FM Transmitter?
• 3 kW• 2 X 3 kW• 5 kW• 2 X 5 kW• 2 X 10 kW
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Generation ofRF Signal
Modulator
Processing of AF Signal
HarmonicFiltration
Basic Chain of Radio Transmitter
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Exciter10 W
PowerDivider
PowerDivider
POWERAMP
POWERAMP
POWERCombiner
POWERAMP
POWERAMP POWER
Combiner
POWERCombiner
PowerDivider
HF
HF
HF
HF
Basic Block Diagram of FM Transmitter
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Thank you!