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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.
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.
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.
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