The industrial attachment was performed at Bangladesh Betar, Kazihata Rajshahi in May, 2019.

1. RAJSHAHI UNIVERSITY OF ENGINEERING & TECHNOLOGY
(RUET)
Department of Electrical & Electronic Engineering (EEE)
Presented By :
Shafin Al Asad Protic
Roll: _____________
Department of EEE, RUET
Supervision of:
Md. ___________________
Lecturer, Department of EEE,
RUET

2. CONTENTS:
 Objectives of Industrial Attachment
 History of Bangladesh Betar
 Operating Principle of a Radio Station
 Equipments Observed in Bangladesh Betar
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3. OBJECTIVES:
 To achieve practical experience about a typical
radio base station
 To know the operating principle of AM and FM
radio broadcasting center
 To get familiar with the equipments used in a radio
broadcasting center
 To know important technical information related
to radio broadcasting in Bangladesh
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4. HISTORY OF BANGLADESH BETAR
 Radio Broadcasting was launched in December 16,
1939 in Bangladesh
 Rajshahi Betar was started in 1954
 Bangladesh Betar played a very vital role during the
independent war in 1971
 At present Bangladesh Betar, Rajshahi
broadcasting there programs both in AM & FM.
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5. THEORY OF A RADIO BROADCASTING
 Both AM and FM Broadcasting is performed at
Bangladesh Betar
 In AM the amplitude of the carrier wave is modified
according to the amplitude of the message signal.
 In FM the frequency of the carrier signal is modified
according to the amplitude of the message signal.
 Modulation technique is necessary to reduce
antenna size, to optimize channel bandwidth and to
transmit signals more effectively.
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6. DIFFERENCE BETWEEN AM & FM
BROADCASTING
AM Broadcasting FM Broadcasting
1. Frequency band is 540-
1650KHz
1. Frequency band is 88-108MHz
2. Require less power to cover a
particular area compared to FM
2. Require more power to cover a
particular area compared to AM
3. Signal quality is not superior. 3. Signal quality is much superior
than AM radio.
4. The coverage area of AM
station is greater than the
equivalent FM station.
4. The coverage area of FM
station is less than the equivalent
AM station.
5. Noise and interference can
easily affect the AM radio
broadcasting.
5. Noise and interference can‟t
easily affect the FM radio
broadcasting. 6

7. EQUIPMENTS OBSERVED AT BANGLADESH
BETAR
Microphones:
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 Observed at Radio Broadcasting Studio
 Used to Convert Sound Signal into Electrical Signal

8. EQUIPMENTS OBSERVED AT BANGLADESH
BETAR
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Audio Console:
 Observed at Radio Broadcasting Studio
 It is the heart of a radio studio
 All the microphones are connected to the audio console
 Microphones are controlled by the audio console

9. EQUIPMENTS OBSERVED AT BANGLADESH
BETAR
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VU Meter:
 Observed at radio studio
 Used to display the strength of the sound signal
 Also called as level meter

10. EQUIPMENTS OBSERVED AT BANGLADESH
BETAR
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Broadcast Audio Processor:
 Observed at Master Control Room
 Process the broadcasting audio signal before transmitting On-
Air

11. EQUIPMENTS OBSERVED AT BANGLADESH
BETAR
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Studio Transmitter Link (STL) :
 Observed at Transmitter Section
 Used to make a link between the studio and transmitter section

12. EQUIPMENTS OBSERVED AT BANGLADESH
BETAR
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FM Exciter :
 Observed at Transmitter Section
 Observed two individual FM exciter at Bangladesh Betar
 10KW exciter works at 88.8MHz frequency
 5KW exciter works at 104MHz frequency

13. EQUIPMENTS OBSERVED AT BANGLADESH
BETAR
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FM Transmitter Power Amplifier:
 Observed at Transmitter Section
 FM Power Amplifier (PA) takes the signal from the FM Exciter
and amplifies it to a licensed power level

14. OTHER EQUIPMENTS OBSERVED AT
BANGLADESH BETAR
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Studio Monitor Speaker: Head Phones:
ON AIR Light: FM Analyzer:

15. OTHER EQUIPMENTS OBSERVED AT
BANGLADESH BETAR
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Transmitting Antennas:

16. OTHER EQUIPMENTS OBSERVED AT
BANGLADESH BETAR
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Power Generator (33KV): Automatic Voltage Regulator
(AVR)