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Dissimilar cellular-systems process signals differently, and yet, all cell-phone-networks use radio-signals that can be interrupted or, even, blocked, completely. This project highlights the design of a simple, low-cost mobile-phone-jammer and aims to present a solution for the problem of inappropriate-use of the cell-phones in restricted and prohibited-areas. The main concept of jamming is the releasing of signal (noise) of the same-frequency which is using by mobile-service-provider to overpower and destruct the user-signal. The fabrication of the jammer involved uncomplicated discrete components, resistors, capacitors, inductors and transistors to generate the required frequency (noise) and then amplifies the frequency generated to range of 800 MHZ to 1.4 GHZ in order to match the frequency of the mobile-phone being transmitted by the base-station. Relatively-satisfactory-jamming of a mobile-signal was confirmed by the blocking of the signals of the mobile-phones in 2G and 3G-networks (UMTS / WCDMA) operated via Safaricom, Airtell, Orange, and YU service-providers, when the phone indicated " no network " , thereby allowing no call to go through, with no-interference to other communication-means observed. Overall recommendation is that further and more deeper-research is needed to produce more-sophisticated and better jamming devices, as not to affect the other base-station-transmission-systems.
This paper presents the design, implementation, and testing of a dual-band mobile-phone jammer. This jammer works at GSM 900 and GSM 1800 simultaneously and thus jams the four well-known carriers frequency in Nigeria (MTN, GLO, AITEL and ETISALAT). This paper went through two stages: Stage one: studying the GSM-system to find the best jamming technique, establishing the system design and selecting suitable components. Stage two: buying all the needed components, drawing the overall schematics, assembling the devices on a well known Veroboard, performing some measurements and finally testing the mobile jammer. The designed stage consist of voltage controlled oscillator, noise generator and Radio Frequency Amplification. MATBLAB Simulink 8.4 was used for the simulation of the frequency oscillator, On Running the simulation, and observing the output of the scope, a signal whose carrier repeatedly moves from 10.6927 to 10.9786 MHz was observed. We can see that the result was a signal at frequency RF covers the whole downlink The designed jammer was successful in jamming the four carriers in Nigeria operating on EDGE or 2G network
Day by day new technologies are making our life simpler. Wireless charging through inductive coupling could be one of the next technologies that bring the future nearer. In this project it has been shown that it is possible to charge low power devices wirelessly via inductive coupling. It minimizes the complexity that arises for the use of conventional wire system. In addition, the project also opens up new possibilities of wireless systems in our other daily life uses.
The ubiquity of the cell phone has made communication easier and faster, integrating the world into a global village as people who are in different geographic location are connected in seconds, it's great to be able to call anyone at any time. There is great need to limit the use of cell phone at particular places and at particular times. Hence, the use of intelligent mobile phone detector is guaranteed. This work concentrates in designing a system that will dictate the presence of GSM signals from an unauthorized user in restricted areas which will in turn trigger another device to restrict the user from service. The system will be able to jam GSM frequency signal upon detection to prevent the transmitted signal from getting to the users cell phone.