Thesis Abstract

Abstract
The construction of a radio frequency GSM signal jammer is a project aimed at designing and building a device capable of disrupting GSM signals within a certain range. The jammer operates by transmitting radio frequency signals on the same frequency as the GSM network, effectively blocking communication between mobile phones and the base station. The project involves the design and assembly of electronic components such as oscillators, amplifiers, filters, and antennas to generate and transmit the jamming signals. Research in signal jamming technology has gained significance due to the proliferation of mobile communication devices and the need to control their use in certain areas such as prisons, military facilities, and theaters. By constructing a GSM signal jammer, the project aims to explore the technical aspects of radio frequency jamming, including signal generation, amplification, and transmission. The device is intended to be portable and easy to operate, allowing for flexible deployment in various scenarios where GSM signal blocking is required. The project methodology includes the selection of suitable electronic components based on their specifications and compatibility with the GSM frequency bands. Circuit design involves the integration of components to form a functional jamming system that can effectively disrupt GSM signals. Testing and optimization of the jammer are crucial steps to ensure its performance meets the desired specifications, such as signal coverage range and interference level. The construction of a radio frequency GSM signal jammer presents challenges in terms of regulatory compliance and ethical considerations. While signal jamming technology can be misused for illegal activities such as eavesdropping or disrupting emergency communication, the project emphasizes the responsible use of the jamming device in authorized contexts. Compliance with legal regulations and guidelines governing the use of signal jamming technology is crucial to prevent misuse and ensure the device is deployed for legitimate purposes only. Overall, the construction of a radio frequency GSM signal jammer is a technical endeavor that involves the integration of electronic components to create a device capable of blocking GSM signals. The project contributes to the field of signal jamming technology by exploring the design and construction of a portable jamming device for disrupting mobile communication within a specified range. The research findings and practical implementation of the GSM signal jammer offer insights into the technical aspects of signal interference and the responsible use of jamming technology in controlled environments.

Thesis Overview

INTRODUCTION
1.1 Introduction
A wireless signal jammer is a device which blocks transmission by creating interference. This wireless signal jammer can be categorized into the Radio Frequency (RF) jammer and GSM jammer.
A Radio Frequency jammer is a device used to disrupt or prevent communication via a broadcasted RF signal. It is an RF and GSM frequency disrupter commonly known as wideband radio frequency (RF) and GSM cell phone jammer. Simultaneously, they can blocks all commercial FM broadcast band (87.5 MHz to 108 MHz) and GSM signal transmissions within the jammer’s transmission range. The device can possibly block these frequencies by transmitting a dirty signal (like noise) on the same frequency at which the GSM and radio system operates.
A Radio Frequency jammer is a device that transmits a radio frequency signal on the same frequency at which the radio system operates and the jamming succeeds when the radio sets in the area where the jammer is located are disabled.
A GSM jammer is a device that transmits a signal on the same frequency at which the GSM operates. The jamming succeeds when the mobile phones in the area where the jammer is located are disabled.
In recent times, where bombs are being planted and detonated by GSM or Radio Frequency signals, this device can be at an advantage by jamming the signals required for the detonation of the bomb.
Presently, the mobile jammer devices are becoming civilian products rather than electronic warfare devices, since with the increasing number of the mobile phone users the need to disable mobile phones in specific places where the ringing of cell phone would be disruptive has increased. These places include worship places, university lecture rooms, libraries, concert halls, meeting rooms, and other places where silence is appreciated.
The solution to these annoying and disrupting noises is to install a device which can block the signal transmission from mobile phones and radio sets and thus, disrupt the triggering of bombs by these wireless signals.
1.2 Project Background
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 (as illustrated in figure 1.1 below). 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”. [10]
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.
As shown in Fig. 1.1 below, the wireless signal jammer is divided into two major branches: the GSM signal jammer, and the radio receiver jammer. The radio receiver jammer is also sub-divided into the Amplitude Modulated (AM) signal jammer and the Frequency Modulated (FM) Signal jammer. The Cell phones and Radio receivers cannot be blocked simultaneously as they operate at separate frequencies. The frequency can then be varied using a frequency tuner mounted on the jammer
Fig. 1.1 Block Diagram of Signal Jammer
The block diagram in Fig. 1.2 below gives a pictorial representation of the working principle of a wireless signal jammer.
RADIO FREQUENCY SIGNAL JAMMER
RADIO FREQUENCY RECEIVER SIGNAL JAMMER (87.5-108 MHz)
AMPLITUDE MODULATED SIGNAL
FREQUENCY MODULATED SIGNAL
GSM SIGNAL JAMMER (935-960MHz)
Fig. 1.2: Pictorial Representation of a Radio Frequency Jammer
CELL TOWER 1
CELL TOWER 2
CELL TOWER 3
CELL TOWER 4
JAMMER
……………………….
…………..
………………………………………………
MOBILE PHONE
RADIO
………………….
……………………………………..
MOBILE PHONE
RADIO
From the Fig. 1.2, the jamming device jams cell phones and radio sets within the range of cell towers 1 and 2.
The cell tower 1, 2, 3 and 4 transmits signals which can be received by GSM or radio sets. The jamming device is placed in-between cell towers 1 and 2 and thus produces a signal which is at the same frequency being operated /transmitted by the cell tower. It can be said that the resultant of the signals is zero.
From Fig. 1.2, the sending object is the jamming device and the target object is the cell towers.
However, mobile phones placed within the range of cell towers 3 and 4 will not be jammed due to the fact that they are not within the range of the jamming device.
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
The Development of Wireless Signal Jammer for Security Application objective is:
ï‚· 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.
ï‚· To construct the development of wireless signal jammer for security application’s circuit.
ï‚· To simulate Intermediate Frequency (IF) section circuit.
ï‚· To block mobile phones transmission by creating interference.
ï‚· To block amplitude modulated and frequency modulated signal transmission by creating interference within its range.
1.5 Scope of Project /Limitation
This project only focuses 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 Nigeria 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 operators which are ETISALAT, MTN and GLOBACOM. This is because, the lines are only for Nigerian users and the frequency band range is between 935 to 960 MHz. These requirements fulfil the GSM900 specifications.
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.
1.6 Summary
This project is mainly intended to prevent the usage of mobile phones in places inside it coverage without interfering with 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 is prohibited by law in many countries. These disadvantages will restrict the use of Radio Frequency jammer.