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Description
Abstract This project is designed to develop a system, which works on 900MHz to 1200MHz . It could helps you cut off mobile connections in defined working area and avoid leak out security valuable data. Cell Phone Jammer provides the ultimate solution in any area where cellular communications frequently cause nuisance either by loud incoming call rings or loud telephone conversations. Cell Phone Jammer is suitable in executive offices, board meetings, conferences, seminars, libraries, cinemas,
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   Abstract This project is designed to develop a system, which works on 900MHz to 1200MHz . It could helps you cut off mobile connections in defined working area and avoid leak out security valuable data.Cell Phone Jammer provides the ultimate solution in any area where cellular communications frequently cause nuisance either by loud incoming call rings or loud telephone conversations.Cell Phone Jammer is suitable in executive offices, board meetings, conferences, seminars,libraries, cinemas, religious places, public transport, concert halls, restaurants and educational institutions etc.Brief Description:Cell Phone mobile Jammer transmits low power radio signals to cut-off communicationsbetween cell phone and cellular base-stations. It does not interfere with any communicationsother than cellular within the defined regulated zone. Upon activating cell Phone mobile Jammer, all idle phones will indicate NO SERVICE . Incoming calls are blocked as if thecellular hand phone is OFF.When cell Phone Jammer, is turned off, all cell hand phones will automatically re-establishcommunications and provide full service. Looks just like your mobile phone, allow you to carry it anywhere without others aware: in class, in seminar, in shop, place of worship, library, ontrain or bus during trip, etc  CHAPTER-1INTRODUCTION The main purpose of a cell phone jammer is to jam a cell phone signal in adesignated area. Cell phone jammer is radio frequency equipment which produces aRF signal to beat the cell phone frequency and effectively jam the signal whichresults no service to any type of cell phone such as CDMA and GSM in the range of 800MHz to 900MHz.The jammer described here is for 900MHz range. Once the cell phone jammer isoperating, all mobile phones present within the jamming coverage area are blocked and cellular activity in the immediate surroundings is jammed. Presently, cell  phones are regularly used by millions of people all over the world. Because we canuse a cell phone from just about anywhere to talk to anybody it is one of the greatest inventions for social and business life today.Even though cell phones have many advantages it eventually arises problems suchas their potential use to invade privacy, contribute to academic cheating, even aid inindustrial espionage. Its great to call anyone at anytime. Unfortunately, restaurants,concerts and temples all suffer from the spread of cell phones because not all cell   phone users know when to stop talking. Who hasn’t seethed through one side of a  conversation about an incredibly personal situation as the talker shares intimatedetails with his friend as well as everyone else in the area. While most of us just  grumble and move on, some people are actually going to extremes to retaliate. As mentioned above, these situations will cause a nuisance, to avoid these problemswe need to implement jammers. Disrupting a cell phone is the same as jamming any other type of radio communication. A cell phone works by communicating with itsservice network through a cell tower or base station.   A jamming device transmits on the same radio frequencies as the cell phone,disrupting the communication between the phone and the cell phone base station inthe tower. This is called a denial of service attack. The jammer denies service of theradio spectrum to the cell phone users within the range of the jamming device. Aswith other radio jamming, cell phone jammers block cell phone use by sending out radio waves along the same frequencies that cellular phones use. This causes enoughinterference with the communication between cell phones and towers to render the phones unusable. On most retail phones, the network would simply appear out of range. Most cell phones use different bands to send and receive communications from towers. Jammers can work by either disrupting phone to tower frequencies or tower to phone frequencies.The jammers effect can vary widely based on factors such as proximity to towers,indoor and outdoor settings, presence of buildings and landscape, even temperatureand humidity play a role. The possible application areas of jamming system are: ã  Prevent industrial espionage where mobile units are used as buggingdevices. ã  Counter terrorism threats such as remotely detonated bombs in high risk areas. ã  Eliminate public nuisance in places like movie theaters, restaurants and temples.1.1PROJECT OBJECTIVE :  The project involves the design and development of cell phone jammers to block all the cell phones within the designated area. This device will disrupt cellular communication with respect to the following: ã  Operate in the 900MHz band. ã  It has a two meter effective blocking radius.CHAPTER-2SYSTEM CONCEPT The heart of the system is the RF oscillator .The frequency of the oscillator is 900MHz. This is the carrier frequency of the jammer. This frequency is modulated by the modulating signal given to the base of the transistor and the modulated output isobtained across the collector terminal. This modulated output is connected to theantenna, which converts the electric signal into electromagnetic signal and transmitsit into the space.The receiver, which is the cell phone in our case, receives the transmitted signal and tries to demodulate the signal. Since this signal is not within the bandwidth of thecell it displays Network Busy on the LCD panel. Since the power of thetransmitter is greater than the srcinal signal transmitted from the cell phone tower the cell phone will not respond to the srcinal signal.This project effectively jams the cell signals. The heart of the circuit is formed by the MCU, which is used to generate a square wave. This signal is fed to theintegrator and it is mixed with noise which is generated by the noise generator in theactive mixer. This low level signal is feed to VCO circuit module, which generates
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