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Design And Construction Of A Remote Controlled Tri–band Frequency Jammer.
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CHAPTER FIVE
CONCLUSION, CHALLENGES, RECOMMENDATION
5.1 Conclusions
This 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 additional UTMS 2100 band. The device was able to jam the four main cell phone carriers in Nigeria: MTN, GLOBACON, AIRTEL and ETISALAT.
5.2 Challenges
a) The difficulties faced in other to get the required circuit components was really frustrating as most vital components were not readily available locally hence the need to make online orders.
b) Most online DIY (do it yourself) stores required a MOQ (minimum order quantity) of at least Five piece for some components like Integrated Circuits and in some cases Fifty pieces for discrete components like resistors and capacitors.
c) When the jammer circuit was connected to the remote control circuit, the current required to energize the relay in the remote control circuit was greatly depleted, hence once the relay is in the ON state, it remains ON even when the OFF button on the transmitter is pushed or activated. This was so since the Pole (Common) of the relay requires sufficient amount of current to switch from the NC (Normally Close) to the NO (Normally Open). To remedy the situation, an additional power supply was provided which was gotten from the charger of an old mobile phone. This enables the remote control circuit and the coil of the relay to draw their current from the initially built power supply (POWER 1) while the Jammer section, the Pole and the NO ( Normally Open) terminal of the relay were connected to the charger of old mobile phone (POWER 2).
5.3 Recommendation
a) I would recommend the use of Microcontroller based remote control for future work this is due to the challenges faced by Infrared remote control. Infrared remote control
circuits are easily affected by voltage fluctuations from the power source.
b) Voltage fluctuation can send pulses of signal to the infra-red receiver, which could turn OFF an initially ON device and vice versa hence, an appreciable distance (at least half a meter) should be maintained between the infrared remote controlled circuit and the Mains/Automatic voltage regulators.
c) Radio Frequency/GSM Jammer can be used to ensure maximum Security and is highly beneficial in a country like Nigeria where in recent times terrorism has become the order of the day and thus, providing an interruption to signals required to detonate bombs and other remote controlled explosives
d) There are a few improvements that should be done to make the device more compact, stable and efficient:
i. The radius can be made wider by using more robust power amplifiers.
ii. The size of the device can be further reduced by the use of transformerless power supply by employing micro soldering.
e) The system does not have the capability to sense the presence of mobile devices (mobile detector) which will then initiate the jamming process. Therefore it is expected that future research will consider this area.
f) After blocking GSM 900, DCS (Digital Cellular Systems) 1800, PSC (Personal Communications Services) 1900 and WCDMA 2100 MHZ the next target is blocking of 4G system that is 2400 MHZ
g) The use of mobile phone when driving has increased the rate of auto crash hence a low range jammer whose active region will span around the driver’s seat and the jamming system will operates whenever the driver turns on the ignition should be considered, by so doing all forms of mobile distractions can be avoided. The low range jammer deactivates the driver’s cell phone without affecting other passenger’s cell phones.
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ABSRACT - [ Total Page(s): 1 ]ABSTRACT COMING SOON ... Continue reading---
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---
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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 THREE - [ Total Page(s): 11 ]The operation of power supply is as shown:The transformer which transforms 220V AC to other levels of voltages. Its functions are outlined below:i. Rectification: Convert the AC voltage to DC voltage.ii. Filtering: “Eliminate the noise†so that a constant DC voltage is produced. This filter is just alarge capacitor used to minimize the ripple in the output.iii. Voltage Regulation: It provides the desired DC voltage.The step down transformer steps down the input volt ... 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---
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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