Download DESIGN AND CONSTRUCT A DUAL BAND MOBILE JAMMER FOR GSM 900 & GSM 1800 PDF

TitleDESIGN AND CONSTRUCT A DUAL BAND MOBILE JAMMER FOR GSM 900 & GSM 1800
File Size1.5 MB
Total Pages71
Table of Contents
                            Front Page
Declaration1
ABSTRACT
Table of Contents
LIST OF TABLES
LIST OF FIGURES
LIST OF ABBREVIATION
Lists of Symbols and SI Units
Acknowledgement
FINAL
	Chapter 1: - Introduction
		1.1 Background to Study
		1.2 Problem Statement(s)
		1.3 Objectives
		1.4 Significance
		1.5 Methodology
	Chapter 2: - Literature Review
		2.1 Brief Overview of Mobile Telephone Systems Technologies (Generations)
		2.2 Brief Overview of GSM
			2.2.1 Architecture and Operation of GSM Network
			2.2.2 Multiple Access and Channel Structure
			2.2.3 Multiplexing Techniques
			2.2.4 Power levels
			2.2.5 What GSM Offers
			2.2.6 Frequency Bands
		2.3 Basic Cellular System
			2.3.1 Basic Multiple Access Schemes In Cellular Systems
	2.4 History of Jamming
		2.4.1 Difference between Jamming and Interference
	2.5 Mobile Jamming and Disabler Techniques
		2.5.1 Type “A” Device (Jammers)
		2.5.2 Type “B” Device (Intelligent Cellular Disablers)
		2.5.3 Type “C” Device (Intelligent Beacon Disablers)
		2.5.5 Type “E” Devices (EMI Shield – Passive Jamming)
		2.6 GSM Jammer Requirements
		2.6.1 Related Works
	Chapter 3: - Design and Implementation
		3.1.0 Design Parameters
		3.2.0. System Design
		3.2.1. Power Calculations
		3.3.0. Parts of the jammer Device
		3.3.1. Power Supply
		3.3.2. Intermediate Frequency (IF) Section
		3.3.3 Radio Frequency (RF) Section
	Chapter 4: - Results and Analysis
		4.1 Results
			4.2 Results from Testing
			4.3 Distance Jammed
			4.4 Simulated Results of Jammer (Output Waveform)
	Chapter 5: - Conclusion and Recommendation
		5.1 Conclusion
		5.2 Recommendation
	References / Bibliography
	Appendix
		Data Sheets
		Bill of Materials
                        
Document Text Contents
Page 1

GHANA TELECOM UNIVERSITY COLLEGE (GTUC)






FACULTY OF ENGINEERING

DEPARTMENT OF TELECOMMUNICATION ENGINEERING

TITLE:

DESIGN AND CONSTRUCT A DUAL BAND MOBILE

JAMMER FOR GSM 900 & GSM 1800

A Project Work Submitted in Partial Fulfillment of the Requirements for

BSc. in Telecommunication Engineering

BY:

AFFO ALEX (B010908017)

EFFAH ONASIS (B010908073)

IBRAHIM I. FAREED (B010908092)



SUPERVISOR:

ING. ISAAC HANSON

JUNE 2012

Page 2

Declaration

This Project is presented as part of the requirements for BSc. in Telecommunication

Engineering awarded by Ghana Telecom University College. I hereby declare that this

project is entirely the result of hard work, research and enquiries. I am confident that

this project work is not copied from any other person. All sources of information have

been acknowledged with due respect.



AUTHOR: AFFO ALEX SIGNATURE…………………….

STUDENT ID: B010908017 DATE: ……………………………



AUTHOR: EFFAH ONASIS SIGNATURE…………………….

STUDENT ID: B010908073 DATE: …………………………....



AUTHOR: IBRAHIM I. FAREED SIGNATURE…………………….

STUDENT ID: B010908092 DATE: ……………………………



SUPERVISOR: ING ISAAC HANSON SIGNATURE……………………..

DATE: ……………………………



HOD: ING ISAAC HANSON SIGNATURE……………………..

DATE: …………………………….

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22


mobile phone. The PFO8103B Hitachi power amplifier from a Nokia mobile phone

was sufficient to amplifier an input signal in the range of 800MHz to 1GHz by 34dB.

It is recommended in the data sheet that the power input should be 1dBm. To meet

this requirement he used another power amplifier stage after the VCO and before the

Hitachi power amplifier module. At that stage he used the MAR-4SM power

amplifier; it has a typical gain of 8dB for frequency range from dc to 1GHz, so the

output after this stage should be around 5dBm. Finally a ¼ wavelength monopole

antenna with 50Ω impedance and a gain of 2dBi, VSWR less than 1.7, bandwidth of

150MHz with 916MHz center frequency with a sweeping range of 625-960 MHz

was selected and used.

Results: The designed jammer was successful in jamming the two GSM-900

networks in Jordan (Fastlink and mobilecom at that time).He faced a problem with

the power supply which was not able to deliver the right amount of load current to

the VCO, which in turn could not tune the VCO to the desired frequency range. In

view of this the jammer could jam a distance of 10meters instead of the intended

20meters.

2. Syed Absar Ahmed Shah, Sohaib Zafar and Syed Ali Wajahat Jafri

undergraduate students at National University of Science and technology

Pakistan undertook their project titled “GSM Jammer”. The project was also

carried out in 2006.

Frequency: Their jammer was intended to jam GSM 900MHz band only

Power Supply: Their power supply used a transformer to convert 220V AC to 12V

AC with a 2A rating. This is then fed to a full wave rectifier with the rectifier made

of four diodes connected as a bridge. Their rectifier converts the 50Hz AC signal to a

100 Hz pulsating DC signal. In order to minimize power fluctuations capacitors were

used to filter out the undesired voltage levels. The capacitors used were as larger as

possible, to minimize the ripples in the dc voltage and filter out any high frequency

noise. To maintain a constant voltage single chip regulators were used to provide

voltages of +5, +9 and -9 volts, the ICs used were LM7805 (+5V), LM7809 (+9V)

and LM7909 (-9V).

Intermediate Frequency: To provide a triangular wave 555- Timer IC operating in

astable mode was used zener diode that allows currents in the forward direction as

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well as in the reverse direction were also integrated. It was connected in a reverse

bias mode. Noise generator consisted of a 6.4V zener diode with small reverse

current, a transistor buffer, LM386 audio amplifier acting as a natural band pass filter

and small signal amplifier. Avalanche noise is similar to short noise but more intense

and has a flat frequency spectrum (white noise).

Radio Frequency: The MAXIM 2623 Voltage controlled oscillator was used for a

frequency range of 935-960MHz.The output power was -3dBm, with an input tuning

voltage of around 120 KHz. A tank circuit is used to generate or oscillate the desired

frequency. In the RF power amplification, to achieve the desired output power a gain

stage is needed. Ahmed used a cheap power amplifier from an old mobile phone. The

PFO8103B Hitachi power amplifier from a Nokia mobile phone was sufficient to

amplifier an input signal in the range of 800MHz to 1GHz by 34dB. It is

recommended in the data sheet that the power input should be 1dBm. To meet this

requirement he used another power amplifier stage after the VCO and before the

Hitachi power amplifier module. At that stage he used the MAR-4SM power

amplifier; it has a typical gain of 8dB for frequency range from dc to 1GHz, so the

output after this stage should be around 5dBm. Finally a helical antenna, with a

reflection coefficient of -17dB was selected and used as an antenna.

Results: The jamming device was successful. As it was able to jam all the existing

networks at the time namely; Mobilink GSM, Telenor, Warid, Paktel and Ulone.

Among the constraints faced was that the power amplifier they used PF08103B was

locally acquired and all the purchased ICs had internal inter-pin short circuits making

them unfit for use. To bypass this, they used a HITTITE GSM power amplifier with

gain of 20dB instead of the 33dB power gain of the intended power amplifier. The

jamming radius was below the maximum theoretical value, this was due to

atmospheric losses the range varied from 5m to 10m depending on these atmospheric

conditions. They also experienced voltage dips due to problems with the power

supply as they were unable to have good voltage regulations.

3. Balal Ansar, Faisal Mehmood Ahmed and Bilal Tariq undergraduate students

of Comsats Institute of Information technology Pakistan undertook their

project titled “Mobile Service Denial” in 2009.

Frequency: Their jammer was designed to work in the GSM 900MHz &1800MHz

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57

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58


Bill of Materials

Reference Description Quantity Price (GH¢)

AN1897

(VIPer22A)

Power Supply 1 28.90

LM555CN 555-timer 1 1.50

LM741CN Operational

Amplifier

1 1.00

LM386 Audio

Amplifier

1 1.00

2N222 Transistor 1 0.70

CVCO55CL(0925-

0970)

RF Power

Amplifier

1 43.01

CVCO55BE(1785-

1900)

RF Power

Amplifier

1 44.132

D1 Zener Diode 1 1.00

C7, C9 Electrolytic

Capacitor

2 0.20

D2, D3 Diode 2 0.20

PF08109B RF Power

Amplifier

2 7.684

C1, C2, C3, C4, C5,

C6, C8, C10

Ceramic

Capacitor

8 1.60

R1 to R9 Resistor 9 0.90

Total:

135.668







*certain components were shipped due to their
unavailability on the local market. The cost of shipment
and money transfer (for payment) totalled approximately
Gh¢512.858

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