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CHAPTER ONE
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”.
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.
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:
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 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.
You either get what you want or your money back. T&C Apply

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