Description
ABSTRACT
Cell phones and radio receivers are used everywhere these days. It’s great to be able to call anyone anytime. But unfortunately, restaurants, movie theatres, concerts, shopping malls and churches all suffer from the spread of cell phones because not all cell-phone users know when to stop talking. While most of us just grumble and move on, some people are actually going to extremes to retaliate. FM Jammer can be one of the solutions to this problem. A transmitter is a device from which signal is transmitted into free space, after insertion of suitable carrier, i.e. is superimposed on a high frequency-sine wave. In Frequency Modulation, frequency of carrier is varied according to the modulating signal. The capture effect, or FM capture effect, is a phenomenon associated with FM reception in which only the stronger of two signals. Major application of Jammer includes in controlling a hostage situation in which police can control when and where a captor can make a phone call. Police can block phone calls during a drug raid so suspects can’t communicate outside the area. Cell-phone jammers can be used in areas where radio transmissions are dangerous, (areas with a potentially explosive atmosphere), such as chemical storage facilities or grain elevators. Moreover it can be used in places like Hospitals, restaurants, movie theatres, concerts, shopping malls and churches where silence is required
TABLE OF CONTENTS
COVER PAGE
TITLE PAGE
APPROVAL PAGE
DEDICATION
ACKNOWELDGEMENT
ABSTRACT
CHAPTER ONE
1.0 INTRODUCTION
1.1 BACKGROUND OF THE PROJECT
- PROBLEM STATEMENT
- OBJECTIVE OF THE PROJECT
- LIMITATION OF THE PROJECT
- PROBLEM AND CHALLENGES
- APPLICATION OF THE PROJECT
- METHODOLOGY
- PROJECT ORGANISATION
CHAPTER TWO
LITERATURE REVIEW
- INTRODUCTION
- OVERVIEW OF RADIO JAMMING
- TYPES OF SIGNAL JAMMERS
- HISTORY OF RF/ GSM JAMMER
- OPERATION OF THE PROJECT
- REVIEW OF THE PREVIOUS WORK
- PRESENT WORK
- HOW A GSM JAMMER WORKS
- HOW GSM JAMMERS ARE MADE
- GSM JAMMER RANGE
- RADIO FREQUENCY JAMMER USES
- RADIO FREQUENCY JAMMER EVOLUTION
- HISTORICAL BACKGROUND OF A GSM JAMMER
CHAPTER THREE
SYSTEM DESIGN
- SYSTEM BLOCK DIAGRAM
- MOBILE JAMMER CIRCUIT DIAGRAM
- CIRCUITS OPERATION
- DESCRIPTION OF COMPONENTS USED
CHAPTER FOUR
4.0 RESULT ANALYSIS
4.1 CONSTRUCTION PROCEDURE AND TESTING ANALYSIS
4.2 CASING AND PACKAGING
4.3 ASSEMBLING OF SECTIONS
4.4 TESTING OF SYSTEM OPERATION
4.5 INSTALLATION OF THE COMPLETED DESIGN
CHAPTER FIVE
5.1 CONCLUSIONS
- RECOMMENDATION
- REFERENCES
CHAPTER ONE
1.1 INTRODUCTION
It is not practicable to send electronic signals over wire to distant places. They are sent by radio. Low frequency signals, as in the audio range, cannot be frequency signals, as in the audio range, cannot be transmitted efficiently, so they are converted to higher frequency called radio frequencies, which can be transmitted effectively over long distance. The electronic equipment used to produce radio frequency (RF) signals for radio transmission is called a transmitter. The function of the transmitter is to generate RF carrier of proper frequency and sufficient power. The output of a transmitter is applied to an antenna, which radiates the signal into space. A basic transmitter consists of an oscillator and an RF amplifier. The oscillator generates a continuous sinusoidal output that serves as the carrier frequency. The carrier is amplified to the required power level by the RF amplifier as shown in figure. An antenna connected to the output of RF amplifier radiates the signal into space.
1.2 BACKGROUND OF THE PROJECT
The technology being used by this device is very simple. The mobile phone transmission is being blocked and interfered by RF which creates high noise. The frequency being generated by the jamming device jams the signal being generated by the cell tower. When the signal has been blocked, the mobile phone will show “NO NETWORK” on the network bar, and radio devices will not be able to tune into any signal. Thus, all phones and radio devices in the 200m radius of the jammer will be having the same situation.
Radio Frequency (RF) and Mobile signal jammer is an illegal device in many countries. It is because the device is blocking the signal which has been approved by government agency as a legal communication transmission system. According to the National Communications Commission (NCC) in Nigeria, “The manufacture, importation, sale, or offer for sale, of devices designed to block or jam wireless transmission is prohibited”.
The reason I am developing this device is for educational purpose only. This device was developed and tested in this report just for Final Year Project presentation. There is no intention of manufacturing or selling such device in Nigeria or elsewhere.
In the construction of this wireless signal jammer, the device will be able to jam GSM and Radio Frequency (RF) signals and this can be done alternatively through a switch.
1.3 PROBLEM STATEMENT
Due to the increasing sophistication and high technology, most people are using mobile phones, and also due to the need for man to stay updated with his environment, the use of radio is also in wide use.
Mobile phones have become a very important communication tool today. With the use of the mobile phones everywhere, it becomes annoying device while working, studying, praying and many more.
Modern technology has contributed to the sophistication of bombs which are being triggered by GSM and Radio signals.
Wireless mobile jammer can be placed in schools, mosque, and conference hall, meeting rooms, library and many more places which need quiet and peaceful environment. This device will block the transmission of Radio and GSM signals.
1.4 OBJECTIVES OF THE PROJECT
The Development of Wireless Signal Jammer for Security Application objective is:
- To design Radio Frequency (RF), Intermediate Frequency (IF), and Power Supply circuit. To construct the Development of Wireless Signal Jammer for Security Application’s circuit.
- To construct the development of wireless signal jammer for security application’s circuit.
- To simulate Intermediate Frequency (IF) section circuit.
- To block mobile phones transmission by creating interference.
- To block multiple frequency of amplitude modulated and frequency modulated signal transmission by creating interference within its range.
1.4 SIGNIFICANCE OF THE PROJECT
Even thought using of cell phone is every important for our daily life but these cell phone devices are creating some problems as the sound of ringing becomes annoying or disrupting in our environment. So the device jammer is the solution to avoid the annoying or disrupting of the cell phone devices.
1.5 LIMITATION OF THE PROJECT
This project only focuses on blocking the signal transmission which is the range between 835 to 960 MHz.
The third limitation is that for reliability of the jammer, a Radio Frequency amplifier should be incorporated but the components required for this are difficult to find in Nigeria.
1.7 PROBLEM AND CHALLENGES
Many of the components were tiny and could not be soldered without significant risk of damage to component. This was overcome by using conductive pens to create contacts on these components Oscillator signals appeared modulated .HF signals leaked through breadboard and interfered with one another. Corrected by placing MUX on RF board
1.8 APPLICATIONS OF PROJECT
Such device can be used to jam detonation of remote controlled explosive devices. In case of earthquakes, floods or other such circumstances, we can jam the desired frequency band and deliver the message needed to be delivered. It can be used in military installations like in military headquarters, checkpoints, base camps etc.
1.9 METHODOLOGY
To achieve the aim and objectives of this work, the following are the steps involved:
- Study of the previous work on the project so as to improve it efficiency.
- Draw a block diagram.
- Test for continuity of components and devices,
- Design and calculation for the jammer was carried out.
- Studying of various component used in circuit.
- Construct a jammer circuit.
- Finally, the whole device was cased and final test was carried out.
1.10 PROJECT WORK ORGANISATION
The various stages involved in the development of this project have been properly put into five chapters to enhance comprehensive and concise reading. In this project thesis, the project is organized sequentially as follows:
Chapter one of this work is on the introduction to a Rf GSM jammer. In this chapter, the background, significance, objective limitation and problem of a Rf GSM jammer were discussed.
Chapter two is on literature review of a Rf GSM jammer. In this chapter, all the literature pertaining to this work was reviewed.
Chapter three is on design methodology. In this chapter all the method involved during the design and construction were discussed.
Chapter four is on testing analysis. All testing that result accurate functionality was analyzed.
Chapter five is on conclusion, recommendation and references.
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