VOCATIONAL TRAINING ON A.I.R PRESENTED BY : RAJEEB AUDDY AVISHEK DAS SUDIPTA RANJAN PALIT
VOCATIONAL TRAINING ON A.I.R
PRESENTED BY :RAJEEB AUDDYAVISHEK DAS
SUDIPTA RANJAN PALIT
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
Source of Programmes
Internal: Studio BroadcastingExternal : Outside Broadcasting
AUDIOSOURCE
(CONTROL ROOM)
Internal:a) Studiosb) Linkedc) NEWS
External:a) Live eventb) Sports event
Categories of station• Transmitter + Studio ( Co-sited)
( FM Station)• Transmitter + Studio ( Non Co-sited)
( FM & AM Station)• Transmitter
( Relay Centre , HPT , SPT)
CONTROL
ROOM
Satellite Uplink EARTH STATION
SB
andC
B
and
C BandUplink Terminal
S BandUplink Terminal
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
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
C - BandUplink Terminal
C - BandDownlink Terminal
(DTH Uplink Station)
DTH Uplink Terminal(Ku-Band)
Important Audio Parameter
Frequency ResponseSignal to Noise Ratio (SNR)
S – BandUplink
C – BandUplink
Ku – BandUplink(DTH)
S – BandDownlink
C – BandDownlink
Ku – BandDownlink(DTH STB)
AUDIO SELECTOR SWITCH(PROG INPUT RACK AT TR HALL)
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
AUDIO SELECTOR SWITCH(PROG INPUT RACK AT TR HALL)
EQUALISED LINE AMPLIFIER
LIMTING AMPLIFIER
EQAAUDIO SELECTOR SWITCHPROG INPUT RACK(TR HALL) LIMITER
TRANSMITTER
TRANSMITTER RECEIVER
What is the basic recognition of a Radio Transmitter?
It’s
Carrier Frequency
What is the power of a Radio Transmitter?
It’s
Rated Carrier Power
What are the basic types of Modulation?
• Amplitude Modulation
• Frequency Modulation
• Digital Modulation
An audio signal (top) may be carried by an AM or FM radio wave.
What are the basic type of Radio Transmitter?• AM Transmitter
• FM Transmitter
• Digital Transmitter
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
What are the basic types of FM Transmitter?
• 3 kW• 2 X 3 kW• 5 kW• 2 X 5 kW• 2 X 10 kW
Generation ofRF Signal
Modulator
Processing of AF Signal
HarmonicFiltration
Basic Chain of Radio Transmitter
Exciter10 W
PowerDivider
PowerDivider
POWERAMP
POWERAMP
POWERCombiner
POWERAMP
POWERAMP POWER
Combiner
POWERCombiner
PowerDivider
HF
HF
HF
HF
Basic Block Diagram of FM Transmitter
Thank you!