DESIGN AND CONSTRUCTION OF AN FM TRANSMITTER FINAL PROJECT

ABSTRACT
An FM transmitter is an electronic device which, with the aid of an antenna, produces radio waves. The transmitter itself generates a radio frequency alternating current, which is applied to the antenna. When excited by this alternating current, the antenna radiates radio waves. frequency modulation (FM) transmitter generates the radio waves by varying the radio signal's frequency slightly.
FM transmitter is basically a VHF colipits oscillator capable of transmitting sound or music to any standard FM receiver. The circuit works on a D.C source which makes it for a pure rectification. FM transmitter also has a capacitor microphone which picks up very weak sound signals.
This FM transmitter was designed using transistors and other component such resistor, inductor and capacitors. This project transmits frequency on 100MHz± 5%. The transmitting distance is l00metres. It is powered with 5volt – 15volts D.C battery using suitable F.M receiver tuned to the transmitting frequency of this project. F.M Transmitter can be used as cordless microphones, mobile phone and for public address purposes. The distant of transmission is limited to 100m and fixed frequency of transmission, away from all other radio station. This gives best range and least interference.
The antenna is attached to the outside of the transmitter, as in portable devices such as cell phones, walkie-talkies, and garage door openers . In more powerful transmitters, the antenna may be located on top of a building or on a separate tower, and connected to the transmitter by a feed line, that is a transmission line.
TABLE OF CONTENTS
TITLE PAGE
APPROVAL PAGE
DEDICATION
ACKNOWLEDGEMENT
ABSTRACT
CHAPTER ONE
1.0 INTRODUCTION
1.1 PURPOSE OF THE PROJECT
1.2 OBJECTIVE OF THE PROJECT
CHAPTER TWO
2.0 LITERATURE REVIEW
2.1 HISTORITICAL BACKGROUND OF THE PROJECT
2.2 REVIEW OF PARTS OF RADIO TRANSMITTER
2.3 REVIEW OF FM BROADCAST BANDS
2.4 MODULATION AND DEMODULATION
2.5 PRE-EMPHASIS AND DE-EMPHASIS
2.6 REVIEW OF MODULATION CHARACTERISTICS
CHAPTER THREE
3.0 CONSTRUCTION
3.1 BASICS OF FM TRANSMITTER
3.2 BLOCK DIAGRAM OF AN FM TRANSMITTER
3.3 FUNCTION OF FM TRANSMITTER BLOCK
3.4 CIRCUIT DIAGRAM OF THE SYSTEM
3.5 CIRCUIT PARTS
3.6 CIRCUIT OPERATION
3.7 DESCRIPTION OF COMPONENTS USED
CHAPTER FOUR
4.0 RESULT ANALYSIS
4.1 CONSTRUCTION PROCEDURE AND TESTING
4.2 CASING AND PACKAGING
4.3 ASSEMBLING OF SECTIONS
4.4 TESTING OF SYSTEM OPERATION
4.5 INSTALLATION OF THE COMPLETED DESIGN
4.6 SYSTEM TROUBLESHOOTING METHOD
4.7 COST ANALYSIS
CHAPTER FIVE
5.0 CONCLUSION
5.1 RECOMMENDATION
5.2 BIBLIOGRAPHY
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