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Design And Construction Of A Remote Controlled Tri–band Frequency Jammer.
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CHAPTER THREE
METHODOLOGY
3.1 DESIGN CONSIDERATION
The design of this cell phone jammer is to transmit at the same frequency as the mobile signal frequency at the base station. This device was designed to block the downlink transmission because the frequency required to be blocked is a Very High Frequency (VHF). In this case, the transmission of devices operating in the GSM1800 band is blocked. The downlink band for this frequency is 800 to 2100MHz.
The project was implemented according to the following plan:
a) I started by studying the jamming techniques, and GSM system to find the best jamming method. The system block diagram was also specified in this stage.
b) I searched for components that are needed for building this device, and specified the main components which are:
i. For RF section, I needed three VCOs that operate at the required frequency bands, two for each of the main bands and one for the 2100Mhz band, three power amplifier, and three antennas.
ii. For the IF section, I used 555timer,Zener diode, mixer, PC power supply and some discrete components (resistors and capacitors).
c) The schematic was drawn and some simulations for the IF-Section were performed. Then, I started to design the layout using Express PCB (Printed circuit board) and some circuit simulation softwares like Livewire and Multisims. The PCB for the IF and RF sections were built using the etching process on copper clad board.
d) The IF and RF sections components were purchased from a Chinese store (alibaba.com), due to the scarcity of the ICs (Integrated Circuits) in the local market.
e) Finally, I assembled and tested the jammer. Fortunately, I got a positive result. Both the 900 MHz and 1800MHz bands were fully jammed including the additional 2100MHz frequency band.
3.2 CIRCUIT DESIGN
3.2.1 POWER SUPPLY UNIT
A 5 V DC power supply from a 220V AC source is designed for the operation of the jammer. The circuit diagram is shown in Figure 3.1.
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APPENDIX A - [ Total Page(s): 1 ]APPENDIX AList of Components• Vero Board • Connecting wire • Power Switch • 30 Amps Fuse • Soldering Lead • Soldering Iron • LEDs • 240V/ 60V Transformer • 12 volts D.C battery • • IN9004, IN4004.1 diode, • 750 Ω, 750.1Ω, 100Ω, 1KΩ, 2KΩ, 22KΩ, 100KΩ, 1KΩ, 2KΩ, 22kΩ resistors • 555 timer • ... Continue reading---
APPENDIX B - [ Total Page(s): 2 ] ... Continue reading---
CHAPTER ONE - [ Total Page(s): 2 ]CHAPTER ONEINTRODUCTION1.1 BACKGROUND OF THE STUDYA mobile phone jammer or signal blocker is an instrument used to prevent cellular phones from receiving signals from base stations. The process of blocking the receiver to receive a transmitted signal is called Jamming of the signal. The jammer effectively disallows cellular phone signal when activated. These devices can be used in practically any location, but are found primarily in places where a phone call would be particularly disruptiv ... Continue reading---
CHAPTER TWO - [ Total Page(s): 3 ]CHAPTER TWOLITERATURE REVIEW AND THEORETICAL FRAMEWORK2.1 INTRODUCTIONWireless networking plays an important role in achieving ubiquitous computing where network devices embedded in environments provide continuous connectivity and services, thus improving human’s quality of life. However, due to the exposed nature of wireless links, current wireless networks can be easily attacked by jamming technology. Jamming can cause Denial-of- Service (DoS) problem which may result in several o ... Continue reading---
CHAPTER FOUR - [ Total Page(s): 5 ]The bar chart in figure 4.9 above shows the jamming strength of the jammer at Eigbejila, Odota and Garin Alimi area of Ilorin west Local government area kwara State, Nigeria. It is obvious from table 4.2 above that as the distance between the cell phone and the base station increases, the effective jamming distance increases. This is due to the fact that the amount of power reaching the cell phone from the base station decreases as the cell phone moves farther from the base station and vice ve ... Continue reading---
CHAPTER FIVE - [ Total Page(s): 1 ]CHAPTER FIVECONCLUSION, CHALLENGES, RECOMMENDATION 5.1 ConclusionsThis project is very useful for mobile phones restricted places such as private meetings, examination hall, defense establishments, military camp, Hospitals; Petrol pumps, Libraries etc. This device can scramble/jam mobile devices in a given area within the operating frequency range of 800MHz - 2100MHz at the range of 2-7 meters. The designed device works in Tri-band. It jams the GSM 800 band, GSM 1800 band and the add ... Continue reading---
REFRENCES - [ Total Page(s): 1 ]REFERENCES1. Science Journal of Physics ISSN: 2276-6367 http://www.sjpub.org/sjp.html.2. Radio Jamming", Wikipedia Foundation, Inc. 2012. 3. "Electronic Warfare", Wikipedia Foundation, Inc. 2012. 4. "Electronic Counter-Countermeasures", Wikipedia Foundation, Inc. 2012. 5. Scourias, John (1997): Overview of the Global System for Mobile Communications, University of Waterloo.6. "Mobile Phone Jammers", Wikipedia Foundation, Inc. 2012.7. Semiconductor device ... Continue reading---
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