1

DEVELOPMENT OF WIRELESS SIGNAL JAMMER FOR SECURITY

APPLICATIONS

MUHAMAD SYAFIQ MUHAIMIN

UNIVERSITI KUALA LUMPUR

JULAI 2012

2

DEVELOPMENT OF WIRELESS SIGNAL JAMMER FOR SECURITY

APPLICATIONS

MUHAMAD SYAFIQ MUHAIMIN

51211110177

Report Submitted to Fulfill the Partial Requirements

for the Bachelor of Enginnering Technology in Electronics

Universiti Kuala Lumpur

JULY 2012

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I declare that this project entitle “Development of Wireless Signal Jammer for

Security Applications” is the results of my own research excepts as cited in

references. The report has not been accepted for any degree and is not concurrently

submitted in candidature of any other degree.

Signature : ............................................................................

Name : ............................................................................

Date : ............................................................................

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APPROVAL

We have examined this report and verify that its meets the program and University

requirements for the Bachelor of ....................................................................

Date: Day/Month/Year Signature : …………………...........................

Supervisor’s Name: …………………............

Official Stamp

Date: Day/Month/Year Signature : …………………...........................

Co-Supervisor’s Name: ………………............

Official Stamp

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ACKNOWLEDGEMENT

First of all, thanks to Allah S.W.T with his bounty makes I complete my Final

Year Project successfully. I’m also thankful to be able to prepare this report within

the required time frame.

Big thanks also goes to my project supervisor Sir Mohd Azlan bin Abu for

giving a lot of guidance, advice, suggestions and support for this project. Final Year

Project also contributes to the students to get knowledge and work experience.

The idea given by my supervisor very thoughtful and helped me to solve

technical problems for this project. Although the project have problem, he still gave

me the confidence to continue my struggle until the end. With this I was able to learn

behaviour from him that implements a project must be a spirit of never giving up.

Finally, all tributes goes to my parents who gives me encouragements,

support and also pray for me and my success. Thanks also goes to all friends who

helped me during I’m having trouble, give me supports, give me new ideas and also

helped me doing my project. Thank you and may Allah S.W.T bless us.

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ABSTRACT

The main focus of this report is to development a wireless signal which can

blocks the signal transmissions from GSM mobile phones. Not only the research

about the signal blocks but also in designing, implementing and testing the whole

signal jammer. This jammer only blocks the transmission of GSM 900 which in

range of 935 to 960 MHz. The jammer also only blocks the three main carrier

MAXIS, DIGI and CELCOM.

This project using GMSK ( Gaussian Minimum Shift Keying ) modulation

technique. GMSK is able to carry digital modulation while it’s still using the

spectrum efficiently [1]

.

The main part is the RF (Radio Frequency) section which amplifies the signal

and to transmit the signal become a noise. After this section the GSM signal will

successfully be blocked.

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TABLE OF CONTENTS

CHAPTER TITLE PAGE

TITLE PAGE i

DECLARATION ii

APPROVAL iii

ACKNOWLEDGEMENTS iv

ABSTRACT v

TABLE OF CONTENTS vi

LIST OF TABLES ix

LIST OF FIGURES x

LIST OF SYMBOLS xii

1 INTRODUCTION 1

1.1 Introduction 1

1.2 Project Background 2

1.3 Problem Statement 3

1.4 Objectives 3

1.5 Scope of Project / Limitation 4

1.6 Summary 4

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2 LITERATURE REVIEW 5

2.1 Introduction 5

2.2 History 6

2.2.1 Previous Work 6

2.2.2 Present Work 6

2.3 Summary 7

3 METHODOLOGY 8

3.1 Introduction 8

3.2 Definition of Methodology 8

3.3 Project Overview 9

3.4 Frequency Band 9

3.5 Block Diagram 9

3.6 Flow Chart 10

3.6.1 Power Supply 11

3.6.2 Intermediate Frequency Section (IF) 13

3.6.2.1 Triangular Wave Generator 14

3.6.2.2 Noise Generator 15

3.6.2.3 Mixer 16

3.6.2.4 Clamper 17

3.6.3 Radio Frequency Section (RF) 18

3.6.3.1 Voltage Controlled Oscillator (VCO) 19

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3.6.3.2 Power Amplifier 20

3.6.3.3 Antenna 20

3.7 Summary 21

4 RESULTS AND ANALYSIS 22

4.1 Introduction 22

4.2 Results 22

4.3 Analysis 24

4.4 Summary 27

5 CONCLUSION 28

5.1 Conclusion 28

5.2 Project Limitation 28

5.3 Recommendation 29

REFERENCES 30

APPENDIX A – B 32 - 33

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LIST OF TABLES

TABLE NO. TITLE PAGE

4.0 Duration Time Taken to Block the Transmission 26

11

LIST OF FIGURES

FIGURE NO. TITLE PAGE

3.0 System Block Diagram 9

3.1 System Flow Chart 10

3.2 Power Supply Circuit Diagram 11

3.3 Power Supply PCB Design 12

3.4 Transformer 9V 12

3.5 Triangular Wave Generator Circuit Diagram 14

3.6 Noise Generator Circuit Diagram 15

3.7 Op-Amp Summer Circuit Diagram 16

3.8 Mixer Circuit Diagram 16

3.9 Clamper Circuit Diagram 17

3.10 IF Circuit Diagram 17

3.11 IF PCB Design 18

3.12 Voltage Controlled Oscillator 19

3.13 Power Amplifier 20

3.14 Antenna 20

4.0 Maxis Operator with Network Coverage 22

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4.1 Digi Operator with Network Coverage 23

4.2 Celcom Operator with Network Coverage 23

4.3 Maxis Operator with No Network Coverage 23

4.4 Digi Operator with No Network Coverage 24

4.5 Celcom Operator with No Network Coverage 24

4.6 Power Supply Circuit 25

4.7 IF Circuit 25

4.8 RF Circuit 26

4.9 Development of Wireless Signal Jammer for Security

Application 27

13

LIST OF SYMBOLS

V - Volt

Ω - Ohm

dBm - Decibel-miliwatt

MHz - Mega Hertz

VAC - Volt Alternating Current

kHz - Kilo Hertz

GHz - Giga Hertz

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LIST OF APPENDICES

APPENDIX TITLE PAGE

A Final Year Project Poster 32

B Datasheets 33

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CHAPTER 1

INTRODUCTION

1.1 Introduction

A wireless signal jammer is a device which blocks transmission by creating

interference. This device was been created by military in early years. The reason why

they develop this device is because to block the radio signal from the commanders to

the army in the battle field.

Nowadays, mobile phone is been widely used all over the world. In Malaysia,

there are the main operators which are Maxis, Digi and Celcom. The wide use of

mobile phones can create some interference such as phone ringing noise. This

ringing noise will be a annoying and disrupting to other human being while they are

in some important task.

These annoying and disrupting noises could happen in library, mosque,

meeting rooms and conference hall. The way to stop these annoying and disrupting

noises is to install a device which can block the signal transmission from mobile

phones.

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The device which can stop the noises is signal jammer. Signal jammer is a

device which can block the signal transmission by creating interference. The

interference been created by the device is high noise frequency which is similar to

the mobile phone transmission frequency.

1.2 Project Background

The technology been used by this device is very simple. The mobile phone

transmission been blocked and interfere by RF which creates high noise. The high

noise that been created by RF is similar to the mobile phone transmission. When the

signal was blocked, the mobile phone will show “NO NETWORK”. All phones in

the radius of the signal jammer will be having the same situation.

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 as a legal

communication transmission. According to the Federal Communications

Commission (FCC) in USA: “The manufacture, importation, sale, or offer for sale, of

devices designed to block or jam wireless transmissions is prohibited” [2].

However, the reason I’m developing the device is for educational purpose

only. This device was design, develop and test in this report just for Final Year

Project presentation. There is no mention to manufacture or sell such device in

Malaysia or elsewhere.

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1.3 Problem Statement

Due to the increasing sophistication and high technology, most people are

using mobile phones. Mobile phones have become a very important communication

tool today. With the use of the mobile phones everywhere, it become a annoying

device while working, studying, praying and many more. Mobile phones can create

loud noises with playing the music. So, 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

from calling and messaging.

1.4 Objectives

The Development of Wireless Signal Jammer for Security Application’s

objectives is:

a) To design RF, IF, and Power Supply circuit.

b) To construct the Development of Wireless Signal Jammer for Security

Application’s circuit.

c) To simulate IF section circuit.

d) To block mobile phones transmission by creating interference.

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1.5 Scope of Project / Limitation

This project only focus on blocking the signal transmission of GSM900

which is the range between 935 to 960 MHz. This is because the components are

hard to find in Malaysia for the GSM1800 frequency range between 1805 to 1880

MHz. The components for GSM1800 are also very expensive compared to GSM900.

The second limitations of the project are, the device only can block the three main

operator which is Maxis, Digi and Celcom. This is because, the lines only for

Malaysian users and the frequency band range is between 935 to 960 MHz. These

requirements fulfil the GSM900 specifications.

1.6 Summary

This project is mainly intended to prevent the usage of mobile phones in

places inside it coverage without interfering communication channels outside it

range, thus providing a cheap and reliable method for blocking mobile

communication in the required restricted area only. Although we must be aware of

the fact that nowadays lot of mobile phones can easily negotiate the jammer effect

are available and therefore advance measures should be taken to jam such type of

devices. The main disadvantage of the mobile phone jammer is that the transmission

of the jamming signal which is prohibited by law in many countries. These

disadvantages will constrain the use of mobile phone jammer.

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CHAPTER 2

LITERATURE REVIEW

2.1 Introduction

. This chapter will discuss more about all of the information related to the

project. It will be explain about the previous history and the present work about my

project. The literature review in this paper is based on Internet, journal, books, and

articles.

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2.2 History

2.2.1 Previous Work

The rapid proliferation of cell phones at the beginning of the 21st century to

near ubiquitous status eventually raised problems, such as their potential use to

invade privacy or contribute to academic cheating. In addition, public backlash was

growing against the disruption cell phones introduced in daily life. While older

analogue cell phones often suffered from poor reception and could even be

disconnected by simple interference such as high frequency noise, increasingly

sophisticated digital phones have led to more elaborate counters. Cell phone

jamming devices are an alternative to more expensive measures against cell phones,

such as Faraday cages, which are mostly suitable as built in protection for structures.

They were originally developed for law enforcement and the military to interrupt

communications by criminals and terrorists. Some were also designed to foil the use

of certain remotely detonated explosives. The civilian applications were apparent, so

over time many companies originally contracted to design jammers for government

use switched over to sell these devices to private entities. Since then, there has been a

slow but steady increase in their purchase and use, especially in major metropolitan

areas[3].

2.2.2 Present Work

The previous work is widely used in United Kingdom. In Malaysia, there

were no manufacturers who manufacture this device. This project was implemented

to block the signal transmission in mosque, meeting rooms, conference hall and

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library. Compare to previous device, it is been used only for military, government

and private companies. The people who brings their mobile phone into mosque,

meeting rooms, conference hall and library will be blocked their signal to have the

silence in the environment. This device also using GSM mobile phone signal

compare to previous technology which uses analogue and older digital signal.

2.3 Summary

This chapter is about the literature review about this device which is about the

previous and present work. In this chapter it been explain about the difference and

the technology was used by the device. This has been done by research using articles,

books, magazines, websites and other methods. The more information about the

present work will be explained in the next chapter.

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CHAPTER 3

METHODOLOGY

3.1 Introduction

This chapter will explained in detail on the methodology and component of

the final year project report. Each part and component that has been selected has as

its own purpose mostly focused on functionality and low cost. In this chapter also,

the technical plan, analyzing and also the specification will be explain.

3.2 Definition of Methodology

Methodology is defined as

i. "the analysis of the principles of methods, rules, and postulates employed

by a discipline".

ii. "the systematic study of methods that are, can be, or have been applied

within a discipline".

iii. "a particular procedure or set of procedures"

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3.3 Project Overview

This section will briefly explain about the complete device, components used,

block diagram and flow chart, design and equipments being used. This device will

operate only using the hardware.

3.4 Frequency Band

It is very important to choose the frequency to block. Basically, the mobile

jammer will transmit the same frequency with the mobile signal frequency not the

base station. This device was design to block the downlink transmission because the

frequency need to block is very high frequency. In this case, the device use GSM900

to block which the frequency is in range 935 to 960 MHz.

3.5 Block Diagram

Figure 3.0: System Block Diagram

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Figure 3.0 shows the systems block diagram where the power supply

producing DC supply to IF and RF circuit. IF section will transfer the signal to RF

section. The process will create the interference signal to block the mobile

transmissions.

3.6 Flow Chart

Figure 3.1: System Flow Chart

In Figure 3.1, the system flow chart showing that when the power is ON, the

supply will go into triangular wave generator and noise generator. The two signals

will be mixed in the mixer so that the signal will be a noise. Then the signal will be

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transferred to the clamper for achieving the desired voltage to VCO. Then the signal

will be go through the VCO at the RF section. After being amplified, the signal will

interfere the mobile signal.

3.6.1 Power Supply

From figure 3.1, it shows that the device needs supply to operate the system.

It is common for the design of power supply where it is using. Figure 3.3 shows the

circuit diagram and Figure 3.4 shows the PCB design for the power supply circuit.

The operation of power supply as shows below:

Figure 3.2: Power Supply Circuit Diagram

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Figure 3.3: Power Supply PCB Design

Figure 3.4: Transformer 9V

i. Transformer

a. Figure 3.2 show the transformer which transform 220VAC to other

levels of voltage.

ii. Rectification

a. Convert the AC voltage to DC voltage.

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iii. Filtering

a. “Eliminate the noise” so that a constant DC voltage is produced. This

filter is just a large capacitor used to minimize the ripple in the output.

iv. Regulator

a. To provide the desired DC voltage.

3.6.2 Intermediate Frequency Section (IF)

Intermediate Frequency section is the section where the signal is produce to

the Radio Frequency section (RF). IF section is the frequency tuning section which

processes the triangular wave mixed with noise signal to sweep the Voltage

Controlled Oscillator (VCO).[4] The IF section consists four main parts which is:

a) Triangular Wave Generator (to tune the VCO in RF section)

b) Noise Generator (to generate output noise)

c) Mixer (to mix the triangular signal and noise signal)

d) Clamper (to reduce the desired voltage for VCO)

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3.6.2.1 Triangular Wave Generator

Figure 3.5: Triangular Wave Generator Circuit Diagram

In Figure 3.5, it shows the Triangular Wave Generator Circuit Diagram.

Triangular wave generator used to sweep the tuning frequency to the Voltage

Controlled Oscillator (VCO). It will sweep the desired frequency range to cover the

downlink frequency which is 935 to 960 MHz where this is the frequency range that

needed to block the transmission for GSM. 555timer IC was used and operates in a

stable mode to generate the sweeping signal to the VCO. The output frequency for

triangular wave generator is 110 kHz.

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3.6.2.2 Noise Generator

Figure 3.6: Noise Generator Circuit Diagram

Figure 3.6 showing about the Noise Generator Circuit Diagram. Without

noise, the output of the VCO is just an un-modulated sweeping RF carrier. Due to

this, it is required to mix the triangular signal and noise (Frequency Modulated (FM)

modulating the RF carrier with noise). To generate the noise signal, zener diode be

used in reverse mode. This is because; operating in the reverse mode will cause

avalanche effect. Avalanche effect in this stage means it will create a wide band

noise. Then the noise will be amplified. There are two stages where the noise will be

amplified which is using NPN transistor as common emitter and then using LM386

IC which is audio amplifier. [4]

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3.6.2.3 Mixer

Figure 3.7: Op-Amp Summer Circuit Diagram

Figure 3.8: Mixer Circuit Diagram

Figure 3.7 describes about the Op-amp pins and the calculation. Figure 3.8

showing the Mixer Circuit Diagram. In this case, mixer is just an amplifier which

operates as a summer. The triangular signal and noise will add together in mixer

before entering the VCO. To achieve this target, LM741 was used. [4]

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3.6.2.4 Clamper

Figure 3.9: Clamper Circuit Diagram

Clamper is a circuit where capacitor is connected in series with resistor and

diode. The circuit is been shown in Figure 3.9. The input of VCO must be bounded

from 0 to 3.5 V. This is the reason why clamper being used. The clamper being used

to achieve the desire voltage been needed for VCO. [4]

Figure 3.10: IF Circuit Diagram

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Figure 3.11: IF PCB Design

Figure 3.10 and Figure 3.11 showing the Intermediate Frequency (IF) circuit diagram

and the PCB design. The circuit has been design after merging the Triangular Wave

Generator, Noise Generator, Mixer and Clamper Circuit.

3.6.3 Radio Frequency Section (RF)

Radio Frequency section is the most important part in this device where the

output of this section will interface with the transmission of mobile signal. This

section contains three parts which is: Voltage Controlled Oscillator, Power Amplifier

and Antenna.

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3.6.3.1 Voltage Controlled Oscillator (VCO)

Figure 3.12: Voltage Controlled Oscillator

The most important part in this section is Voltage Controlled Oscillator. The reason

it is important because Voltage Controlled Oscillator will generate the RF signal

which will block the mobile signal transmission. The output of the Voltage

Controlled Oscillator has a frequency which is proportionally with the input voltage.

In this case, we can change the output frequency by changing the input voltage.

There are three criteria to select a Voltage Controlled Oscillator:[4]

a) Cover the bands that needed.

b) Low cost.

c) Run at low power consumption.

After some period of researching of the component, finally I found out that

CVCO55CL is the suitable component for blocking the frequency range 935 to 960

MHz. Figure 3.12 showing the Voltage Controlled Oscillator image. The output

power is up to 8dBm. The reason this component been selected because of these

reasons:[4]

a) Surface mount. Can reduce the size of product.

b) Large output power which can reduce the amplification stages.

c) Having the same value of power supply which is 5V.

d) Having same noise properties.

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3.6.3.2 Power Amplifier

Figure 3.13: Power Amplifier

The power amplifier been used in this device is ADL5570 as shown in Figure

3.13. This power amplifier specification is suitable to be used in telecommunications

devices. Therefore the specifications for the device are as follows:

a) Fixed gain of 29dBm.

b) Operate from 2.3GHz to 2.4GHz.

c) Power out 25dBm.

3.6.3.3 Antenna

Figure 3.14: Antenna

Antenna is a device which transmits a signal around it. So, in this case the

antenna must be select due to the project’s objectives. The criteria as follows:

a) Monopole antenna.

b) Input impedance 50Ω.

c) VSWR < 2 (Voltage Standing Wave Ratio).

d) Frequency 850 MHz to 1 GHz.

e) Range covered in 1meters.

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This criteria been chosen because the antenna must transmit the same frequency as

the mobile signal frequency. Image of the Antenna be shown in Figure 3.14. When

the ratio between the antenna frequency and the mobile signal frequency is 1:1, the

mobile signal frequency will be blocked.

3.7 Summary

This chapter explains about the methods and the functionality of all the

components that were used. Development of Wireless Signal Jammer for Security

Application device have three main parts which is power supply, intermediate

frequency section and radio frequency section. The device operates when the power

supply gives ± 12V to IF and RF section. The triangular wave regulator will regulate

the triangular waveform as an input to RF section. The triangular wave and the noise

signal will be mix in the mixer for the RF so that it will transmit the desired noise

frequency. The mixture of the signal then will be transfer to clamper so that the

clamper will give the desired voltage range between 0 to 3.5V for Voltage Controlled

Oscillator. Then the signal will be amplified at power amplifier at RF section the

been transmitted as a high noise frequency range 935 to 960 MHz.

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CHAPTER 4

RESULTS AND ANALYSIS

4.1 Introduction

This chapter will explain the results of the project and the analysis throughout

this project. The results will be explained about the testing of the project. The

analysis will be explained about the result be obtained.

4.2 Results

Results been obtained when the Development of Wireless Signal Jammer for

Security Application was “ON”, the mobile phone transmission signal will show

“NO NETWORK” . Figure 4.0, Figure 4.1 and Figure 4.2 below shows the results

when the device “OFF” and Figure 4.3, Figure 4.4 and Figure 4.5 below shows the

results when the device “ON”:

a) Development of Wireless Signal Jammer for Security Application “OFF”.

Figure 4.0: Maxis Operator with Network Coverage

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Figure 4.1: Digi Operator with Network Coverage

Figure 4.2: Celcom Operator with Network Coverage

b) Development of Wireless Signal Jammer for Security Application “ON”.

Figure 4.3: Maxis Operator with No Network Coverage

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Figure 4.4: Digi Operator with No Network Coverage

Figure 4.5: Celcom Operator with No Network Coverage

4.3 Analysis

The circuit for Development of Wireless Signal Jammer for Security

Application has been constructed using Printed Circuit Board (PCB). The circuit

firstly been constructed using Dip Trace software where the circuit been design then

transferred to PCB layout as shown at Figure 3.3, Figure 3.4, Figure 3.10 and Figure

3.11 in Methodology. The circuit then is soldered as shown below in Figure 4.6,

Figure 4.7 and Figure 4.8. There are three main circuits in this device which is Power

Supply circuit, IF circuit and RF circuit. The reason it been done in three circuit is

because to ease the troubleshooting process. Picture below shows the circuits been

used in Development of Wireless Signal Jammer for Security Application:

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Figure 4.6: Power Supply Circuit

Figure 4.7: IF Circuit

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Figure 4.8: RF Circuit

Development of Wireless Signal Jammer for Security Application was

successfully blocking the transmission of three main operator in Malaysia which is

Maxis, Digi and Celcom. When the device is “ON”, the mobile phone which is the

range of the device will be blocked the GSM phone signal. This device will not

function to the 3G phone signal because the frequency range for 3G is too high. The

frequency for 3G is 2100 MHz. GSM phone signal been blocked because the

frequency range covered by the device is same which is 935 to 960 MHz.

The actual testing is not just to block the transmission signal but to check the

duration time taken by the device to block the transmission between these three

operators Maxis, Digi and Celcom. From the testing, the time taken for the device to

block the transmission between these three operators was totally different. The

duration time taken for the device to block the transmission is shown in table below:

Table 4.0: Duration Time Taken to Block the Transmission

Operators Maxis Digi Celcom

Duration Time (s) 55 37 87

The threshold of the operator at the mobile phone is different which makes the

duration time takes to block the transmission also different. Digi operator is the

closest threshold to the device which makes it to be blocked faster than others.

41

Development of Wireless Signal Jammer for Security Application devices shown

below in Figure 4.9:

Figure 4.9: Development of Wireless Signal Jammer for Security Application

4.4 Summary

Based on the result and analysis, the device can successfully block the signal

transmission of the mobile phone. The device can block three main operators in

Malaysia which are Maxis, Digi and Celcom. The duration time also been tested in

this device. Although the device can operate as expected, but the radius of the

antenna did not meet the expectation. The radius should be more than obtained result

which is 1meters.

42

CHAPTER 5

CONCLUSION

5.1 Conclusion

Development of Wireless Signal Jammer for Security Application

successfully achieves the entire objectives targeted. Development of Wireless Signal

Jammer for Security Application has been designed to stop mobile phone ringing and

avoids loud phone conversations. This device mainly been designed for the use of

public. The means of this is to locate this device at mosque, schools, convention hall,

meeting rooms and library. These places always need silents and peaceful

environment. The device has been designed to works in GSM900 band. The

frequency for GSM900 is 935 to 960 MHz which is GSM or 2G mobile phone

transmission. The device was able to block the transmission for three main operators

in Malaysia which is Maxis, Digi and Celcom. The radius that covered by the device

is too small due to power supply variation with load current. Development of

Wireless Signal Jammer for Security Application will give benefits to community

and the solution for the place that not allowed phone ringing and loud phone

conversations.

5.2 Project Limitation

1) Wireless signal jammer is an illegal device in Malaysia to be used the

frequency that been used by the operators.

43

2) The components are hard to find and expensive.

3) The radius covered by the device is too small.

4) The frequency and the power used are only for GSM transmission.

5.3 Recommendation

There are a few improvements that should be done for making the device

more stable. Firstly, the main subject is the frequency range. The device not only can

block GSM transmission but also can block 3G transmission. This can be done by

using high frequency VCO and power amplifier.

For the radius, it can be wider. So to improve the jammer a more stable power

supply should be designed for robust operation of the device. The antenna also must

be a bit bigger for the sake of power transfer.

44

REFERENCES

[1] Radio-Electronics.com, What is GMSK modulation – Gaussian Minimum Shift

Keying, http://www.radio-electronics.com/info/rf-technology-design/pm-phase-

modulation/what-is-gmsk-gaussian-minimum-shift-keying-tutorial.php

[2] Federal Communications Commission, Blocking & Jamming, 2002,

http://wireless.fcc.gov/services/index.htm?job=operations_1&id=broadband_pcs

[3] Wikipedia, Mobile Phone Jammer, 2007,

http://en.wikipedia.org/wiki/Mobile_phone_jammer

[4] Ahmed Sudqi Hussein Abdul-Rahman, Ahmad Nasr Raja Mohammad, Dual-

Band Mobile Jammer for GSM 900 and GSM 1800, Technical Paper, Jordan

University of Science and Technology, 2008.

[5] Wireless Meseum, History of Wireless Phone,

http://www.wirelessmuseum.org/history

[6] Rappaport, Wireless Communication, Prentice, 2nd Edition

[7] Siwiak. K, Radiowave Propagation and Antennas for Personal Communication,

Artech House, 2nd

Edition

[8] Pozar, D.M, Microwave Engineering, John Wiley and Sons, 2nd

Edition

[9] Gopalan, K.Gopal, Introduction to Digital Microelectronics Circuit, Irwin, New

York, 1996

[10] Floyd, Electronic Devices, Prentice Hall, 5th

Edition

[11] Margaret Rouse, GSM (Global System for Mobile Communication), 2007,

http://searchmobilecomputing.techtarget.com/definition/GSM

[12] Peter Bevelacqua, Introduction to Antennas, 2009-2010, http://www.antenna-

theory.com/

[13] Peter Bevelacqua, Antenna Basics, 2009-2010, http://www.antenna-

theory.com/basics/main.html

[14] Macnamara, Thereza, Introduction to Antenna Placement and Installation, John

Wiley and Sons, 2010, ISBN 0-470-01981-6.

45

[15] Joe Robert, Audio Power Amplifier Fundamentals, 2012,

http://www.rocketroberts.com/techart/amp.htm

[16] Z-Communications, VCO (Voltage Controlled Oscillator) Modules,

http://www.zcomm.com/products/vcos.shtml

[17] WWW.Electronics-Tutorial.COM, Voltage Controlled Oscillator, 2005,

http://www.electronics-tutorials.com/oscillators/voltage-controlled-oscillators.htm

[18] Understanding VCO’s Concept, Mini-Circuits, 2009

[19] John Hewes, Power Supplies, 2011,

http://www.kpsec.freeuk.com/powersup.htm

[20] F.Langford Smith, Wireless Press, Radiotron Designer’s Handbook, 3rd

Edition,

1946

[21] Lundstrom, Lars-Ingemar Lundstom, Understanding Digital Television, Taylor

& Francis, 2006

[22] Federation of American Scientist, Communications Theory,

http://www.fas.org/spp/military/docops/afwa/U2.htm

[23] Weiner, Melvin.M Weiner, Monopole Antennas, CRC Press, 2003, ISBN 0-

470-01981-6.

46

APPENDIX A

Final Year Project Poster

DEVELOPMENT OF WIRELESS SIGNAL JAMMER FOR

SECURITY APPLICATIONMUHAMAD SYAFIQ MUHAIMIN(51211110177)

BET (Hons.) in ELECTRONICS

MOHD AZLAN BIN ABU

University Kuala Lumpur, British Malaysian Institute.

ABSTRACT

• Development of Wireless Signal Jammer for Security

Application is a device that can sense the presence of

activated mobile phone signals.

• It will sense by using the Radio Frequency (RF) Detector.

• It is suitable to implement in Mosque, Schools, Meeting

rooms and Convention hall.

• It will detect the mobile phone signals and jam the signals for

not interrupting other people or events.

OBJECTIVES

• To design RF, IF and Power Supply Circuit.

• To construct the Development of Wireless Signal Jammer for

Security Application circuit.

•To blocks transmissions by creating interference.

METHODOLOGY

• Power Supply

• Radio Frequency (RF)

• Intermediate Frequency (IF)

LIMITATIONS

• This device only blocks GSM mobile signals.

• MAXIS, CELCOM and DIGI signal only can be block.

RESULTS

JAMMER OFF

JAMMER ONBLOCK DIAGRAM

Power

SupplyIF RF

Signal

Interference

CONCLUSIONS

• The circuit has been designed for RF, IF, and Power Supply.

• The circuit has been constructed for the project.

• The project successfully blocked the GSM transmission signal

by creating interference.

REFERENCES

[1] Robert G. Winch , Telecommunication Transmission

System, McGraw-Hill, New York, 1993.

[2] Moe Rahnema, Overview of the GSM systems and protocol

Architecture, IEEE Communications Magazine, April 1993.

[3] Ahmad Jisrawi, GSM-900 Mobile Jammer, Technical

Report, Jordan University of Science and Technology, 2006.

[4] Ahmed Sudqi Hussein Abdul-Rahman, Ahmad Nasr Raja

Mohammad, Dual-Band Mobile Jammer for GSM 900 and

GSM 1800, Technical Paper, Jordan University of Science and

Technology, 2008.

[5] Pozar D., Microwave Engineering, John Wiley and Sons,

2005.

SPECIFICATIONS

GSM Freq Band 935MHz – 960MHz

VCO 0 – 3.5 V, 5dBm

Antenna Monopole, 50Ω, VSWR < 2, 850MHz

- 1GHz

Mod. Technique GMSK

Power Amp Gain 34dBm

Intermediate Freq 110kHz

FLOW CHART

Start

Triangular Wave

Generator

Noise

Generator

Mixer

Clamper

RF

Signal Interference

FIGURE 1 : SYSTEM BLOCK DIAGRAM

FIGURE 2 : SYSTEM FLOW CHART

TABLE 1: SYSTEM SPECIFICATION

FIGURE 3 : BEFORE AND AFTER TRANSMISSIONS BLOCK

RESULTS

47

APPENDIX B

Datasheets

48