CELLPHONE JAMMER CIRCUIT DESIGN AND IMPLEMENTATON BY AHMED ABDULHADI ...

69 Pages·2017·3.12 MB·English

CELLPHONE JAMMER CIRCUIT DESIGN AND
IMPLEMENTATON

BY
AHMED ABDULHADI AHMED ABDALHADI
INDEX no. 124012

Supervisor
Prof. Sharief Fadul Babiker

A REPORT SUBMITTED TO
UNIVERSITY OF KHARTOUM
IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF
B. Sc (HONS) Electrical and Electronic Engineering
(ELECTRONICS ENGINEERING)
Faculty Engineering
Department of Electrical and Electronic engineering
October 2017
DECLARATION OF ORIGINALINTY
I declare that this report entitled “Cell phone Jammers Circuit Design and implementation” is
my own work except as cited in the references. This report had not been accepted for any degree
and was not being submitted concurrently in candidature for any degree or another award.

Name:
Signature:
Date: / / 2017

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ACKNOWLEDGEMENTS

I would first like to thank my thesis advisor Prof. Sharief Fadul Babiker of
the Faculty of Engineering – Department of Electrical and Electronic Engineering
at University of Khartoum. He kept an open mind to my thoughts and provided
more than the required knowledge and guide into making this report happen.
He always provided constructive criticism and lessons to learn from .

I would also like to thank the experts who were involved in the educational
process for this research project: Prof. Sami Mohamed Sharief (Communication
Engineering), Prof. Mustafa Omer Nawri (Control Engineering), Dr. Iman
AbuAlMaali AbdalRahaman (Communication Engineering), Dr. Samah Omer
Hashem (Electronics Engineering), Mr. Mohannad Ahmed AlHassan
(Electronics Engineering) and Dr. Hiba Hassan Imam. Without their passionate
participation and input, the thesis could not have been successfully conducted.

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DEDICATION

My Mom, being the strong independent woman she is
My Father, being the provider and the generous man he is with his thoughts and feelings
My sisters, being the inspiration behind all my progress in life
My brother, being the reason behind all my efforts
My friends, for being the best the world can offer
Hanaa Salah Musa, being the wall to lean on at times of need just to hold me straight back on my
feet.

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ABSTRACT

This research presents the design, implementation, and testing of the design. This project have
implemented the First section of the device due limitations of obtaining the rest of the required
components but the design and the calculations have been measured to achieve the full design.
The design if manufactured correctly shall be capable of jamming the GSM 900 and GSM 1800
simultaneously and therefore jams the three well-known carriers in Sudan (Zain, Sudani, and
Mtn).
This project went through four phases:
Phase one: studying the GSM-system to learn about signals and distortions in circuits, and how
does the GSM-system filter them.
Phase two: studying the Radio frequency methodology and acknowledge its participation in our
project and design
Phase three: collecting the parts and studying their behaviour in real-time systems
Phase four: running tests and simulations

The design came out as a success and we even manufactured the IF part and obtained the desired
results, but failed to obtain VCO’s of the RF part for it to be manufactured as well.

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صلختسملا

1800 و زترهاغيم 900 ددرت ىلع شوشي فوسو ددرتلا جودزم شيوشت زاهج قيبطت و ةاكاحم و ميمصت ريرقتلا اذه ضرعي
. ةيولخلا فتاوهلل زترهاغيم
. نادوسلا يف ةمزلالا عطقلا رفوت مدع ببسب يناثلا ءزجلا قيبطت رذعتو ةلماك ةفصب عورشملا نم لولاا ءزجلا قيبطت مت
.ًلاماك زاهجلا قيقحتل ةمزلالا تاباسحلاو ميمصتلا لمع مت نكلو
1800 و 900 نديدرتلا ىلع شيوشت ىلع ًلاباق زاهجلا نوكي فوس ميمصتلل ًاعابت ةحيحص ةقيرطب هعينصت مت اذا ميمصتلا
. زترهاغيم
) ينادوس , ن ت ما , نيز( نادوسلا يف ةفورعملا تلااصتلاا تاكرش ىلع شوشي فوس كلذبو
: لحارم ةعبراب رم عورشملا اذه
لصاوتلا ماظنو لصاوتلل يملاعلا ماظنلا نع ةساردلا : ىلولاا ةلحرملا
ةيولخلا ةاراشلااو ويدارلا ددرتلا ةسارد : يناثلا ةلحرملا
ةبولطملاو ةرفوتملا عطقلا ديدحت و عطقلا عيمجت : ةثلاثلا ةلحرملا
ةلواحملاو بيرجتلا : ةعبارلا ةلحرملا
.ًاضيا حاجنب رابتخلاا ةلحرم زاتجاو )ضفخنملا ددرتلا(زاهجلا نم لولاا ءزجلا عينصت متو ةاكاحملا ةلحرم يف ميمصتلا حجن
.هقيبطت متي مل يويدارلا ددرتلا ءزج قيبطتل ةبولطملا عطقلا ىلع لصحتلا ىلع ةردقلا مدع ببسبو

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TABLE OF CONTENTS
DECLARATION OF ORIGINALINTY ........................................................................................ ii
ACKNOWLEDGEMENTS ........................................................................................................... iii
DEDICATION ............................................................................................................................... iv
ABSTRACT .................................................................................................................................... v
صلختسملا ......................................................................................................................................... vi
TABLE OF CONTENTS .............................................................................................................. vii
LIST OF FIGURES ........................................................................................................................ x
LIST OF ABBREVIATIONS ....................................................................................................... xii
1 Chapter One: INTRODUCTION .......................................................................................... 14
1.1 Overview ....................................................................................................................... 14
1.2 Problem Statement ........................................................................................................ 15
1.3 Background and Motivation ......................................................................................... 16
1.4 Objectives of the Project ............................................................................................... 17
1.5 Thesis Layout ................................................................................................................ 18
2 Chapter Two: LITERATURE REVIEW .............................................................................. 19
2.1 Overview ....................................................................................................................... 19
2.2 Introduction to GSM/DCS Systems .............................................................................. 19
2.2.1 GSM 900 ................................................................................................................. 20
2.2.2 GSM 1800 (DCS) ................................................................................................... 21
2.3 How cell phones work .................................................................................................. 21
2.3.1 TDMA ..................................................................................................................... 21
2.3.2 CDMA..................................................................................................................... 22
2.3.3 TDMA vs. CDMA .................................................................................................. 23
2.4 Cell phone Jammers Circuit .......................................................................................... 23
2.5 Jamming Techniques .................................................................................................... 24
2.5.1 Noise Strategy ......................................................................................................... 24
2.5.2 Phase Strategy ......................................................................................................... 24
2.5.3 Techniques .............................................................................................................. 24
2.5.3.1 Spoofing........................................................................................................... 24
2.5.3.2 Shielding Attacks ............................................................................................. 24
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2.5.3.3 Denial of Service ............................................................................................. 24
2.6 Avalanche Breakdown .................................................................................................. 25
2.6.1 Avalanche Noise ..................................................................................................... 26
2.7 Voltage Control Oscillators .......................................................................................... 27
2.8 555Timer ....................................................................................................................... 29
2.8.1 NE555B................................................................................................................... 30
2.8.1.1 Features:........................................................................................................... 30
2.8.1.2 A-stable mode .................................................................................................. 31
2.9 LM741........................................................................................................................... 33
2.10 LM386........................................................................................................................... 33
2.11 Monopole Antenna........................................................................................................ 35
3 Chapter Three: METHODOLOGY AND IMPLEMENTATION ........................................ 37
3.1 Introduction ................................................................................................................... 38
3.2 Design parameters ......................................................................................................... 38
3.2.1 The distance to be jammed (D) ............................................................................... 38
3.2.2 Frequency bands ..................................................................................................... 38
3.2.3 Jamming to signal Ratio.......................................................................................... 40
3.2.4 Free space loss (FSPL)............................................................................................ 42
3.3 System design ............................................................................................................... 42
3.3.1 Power calculations .................................................................................................. 42
3.3.2 Parts of the jammers device .................................................................................... 43
3.3.2.1 The power supply ............................................................................................ 43
3.3.2.2 The IF-Section ................................................................................................. 44
3.3.2.2.1 Triangle wave generator .............................................................................. 45
3.3.2.2.2 Noise generator ........................................................................................... 46
3.3.2.2.3 The mixer .................................................................................................... 47
3.3.2.2.4 Clamper ....................................................................................................... 48
3.3.2.3 The RF-Section ................................................................................................ 50
3.3.2.3.1 Voltage Control oscillators.......................................................................... 50
3.3.2.3.2 Power amplifier ........................................................................................... 51
3.3.2.3.3 Antenna ....................................................................................................... 51
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4 Chapter Four: RESULTS AND DISCUSSION .................................................................... 53
4.1 Summary ....................................................................................................................... 53
4.2 IF-Section ...................................................................................................................... 54
4.2.1 Triangle wave generator ......................................................................................... 54
4.2.2 Noise Generator ...................................................................................................... 55
4.2.3 Mixer ....................................................................................................................... 56
4.2.4 Clamper ................................................................................................................... 57
4.3 Schematic, PCB layout, and Implementation ............................................................... 58
4.4 RF-Section .................................................................................................................... 60
5 Chapter Five: CONCLUSION AND FUTURE WORK ...................................................... 61
5.1 The problem .................................................................................................................. 61
5.2 The approach ................................................................................................................. 61
5.3 Future work and Alternative solutions .......................................................................... 62
5.4 Solutions and tryouts: ................................................................................................... 62
6 REFRENCES ........................................................................................................................ 63
Appendix A ................................................................................................................................... 64
Appendix B ................................................................................................................................... 65
Appendix C ................................................................................................................................... 66
Appendix D ................................................................................................................................... 68

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LIST OF FIGURES
Figure 2.1Cell phones working on the GSM 900 bands ............................................................... 21
Figure 2.2 TDMA to CDMA ........................................................................................................ 23
Figure 2.3 Avalanche breakdown mechanism .............................................................................. 25
Figure 2.4 Avalanche breakdown ................................................................................................. 26
Figure 2.5 Avalanche Noise generator example ........................................................................... 27
Figure 2.6Voltage Control Oscillator ........................................................................................... 27
Figure 2.7 Graph of Constant voltage applied to Oscillator ......................................................... 28
Figure 2.8 555timer in Monostable mode ..................................................................................... 29
Figure 2.9 555timer in A-Stable mode ......................................................................................... 30
Figure 2.10 Functional block diagram of a NE555B .................................................................... 31
Figure 2.11 Circuit for Astable mode ........................................................................................... 32
Figure 2.12 Application Information ............................................................................................ 32
Figure 2.13 LM741 Schematic Diagram ...................................................................................... 33
Figure 3.1 GSM used bands .......................................................................................................... 38
Figure 3.2Jammer main blocks ..................................................................................................... 43
Figure 3.3power supply blocks ..................................................................................................... 43
Figure 3.4PC power supply Input Voltages .................................................................................. 44
Figure 3.5A-stable 555timer ......................................................................................................... 45
Figure 3.6 Implementation of the NE555B................................................................................... 46
Figure 3.7 Implementatin of the Noise generator ......................................................................... 46
Figure 3.9 Implementation of the LM741..................................................................................... 48
Figure 3.8 OP-Amp Summer circuit ............................................................................................. 47
Figure 3.10Positive clamper ......................................................................................................... 48
Figure 3.11 Implementation of the clamper .................................................................................. 49
Figure 4.1PCB triangle wave generator ........................................................................................ 54
Figure 4.2 saw tooth generated signal (sweep signal) .................................................................. 55
Figure 4.3The noise generator and its output on an oscillator ...................................................... 56
Figure 4.4 Output after the mixer of the signals ........................................................................... 57
Figure 4.5 Output after the Clamper ............................................................................................. 57
Figure 4.6 The schematic of the IF-Section .................................................................................. 58
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