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Design And Construction Of A Remote Controlled Tri–band Frequency Jammer.
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3.2.3 RADIO FREQUENCY SECTION
Radio Frequency section is the most important part of this design because the output of the RF section will interface with the transmission of mobile signal. This section contains three parts which is: Voltage Controlled Oscillator (VCO), Power Amplifier and Antenna.
3.2.3.1 VOLTAGE CONTROLLED OSCILLATOR
The most important part in this section is Voltage Controlled Oscillator. This is because the Voltage Controlled Oscillator will generate the RF signal which will block or interfere with the mobile signal transmission. The output of the Voltage Controlled Oscillator has a frequency which is proportionally with the input voltage, that is, we can change the output frequency by changing the input voltage. Three criteria were considered in selecting an appropriate Voltage Controlled Oscillator:
(a) The bands of operation.
(b) Low cost.
(c) Low power consumption.
In achieving the goals stated above, CVCO55BE for GSM 1800 was applicable. The output frequency is 1874-2074 MHz and the output power is up to 8 dBm. The VCO is shown in Figure 3.8. This component is a surface mount thus reducing the size of the jammer. It has a large output power which reduced the number of amplification stages and takes an input voltage of 5V which is the same as that supplied by the power supply unit. It also has the same noise property.
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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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