08-12-2012, 01:46 PM
A Term Paper On CELL PHONE JAMMER
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Abstract
The last few years have witnessed a dramatic boom in the wireless communications industry, hence increasing the number of users of mobile communication devices. This magnified the need for a more efficient and reliable signal scrambler. This paper deals with the Mobile Jamming Technology. The concept of jamming technology is studied in a step-by-step approach. The mobile jammer in the frequency range of 890MHz to 960MHz (GSM) is developed. Its circuit analysis simulation is performed using Speace-spice Software. Antenna simulation is done by using IE3D software [8]. The jammer circuit is designed with minimum cost and high efficiency.
The jammer jams the signal within five meter effective radius. Index terms– Antenna, Jammer, Wide band frequency.
History
The rapid proliferation of cell phones at the beginning of 21st century to near ubiquitous status eventually raised problems such as their potential use of invade privacy or contribute to rampant and egregious academic cheating. In addition public black lash privacy or contribute to rampant The rapid proliferation of cell phones at the beginning of the 21st century to near ubiquitous status eventually raised problems such as their potential use to invade privacy or contribute to rampant and egregious academic cheating. In addition public backlash was growing against the intrusive disruption cell phones introduced in daily life. While older analog cell phones often suffered from chronically poor reception and could even be disconnected by simple interference such as high frequency noise, increasingly sophisticated digital phones have led to more elaborate counters. Cell phone jamming devices are an alternative to more expensive measures against cell phones, such as Faraday cages, which are mostly suitable as built in protection for structures. They were originally developed for law enforcement and the military to interrupt communications by criminals and terrorists. Some were also designed to foil the use of certain remotely detonated explosives. The civilian applications were apparent, so over time many companies originally contracted to design jammers for government use switched over to sell these devices to private entities. Since then, there has been a slow but steady increase in their purchase and use, especially in major metropolitan areas.
Introduction to cell phone jammer
Cell phones are everywhere these days. According to the Cellular Telecommunications and Internet Association, almost 195 million people in the United States had cell-phone service in October 2005. And cell phones are even more ubiquitous in Europe. It's great to be able to call anyone at anytime. Unfortunately, restaurants, movie theaters, concerts, shopping malls and churches 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 intimate details 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. Cell phones are basically handheld two-way radios. And like any radio, the signal can be disrupted, or jammed.
4. Cell Phone Jamming Basics Disrupting a cell phone is the same as jamming any other type of radio communication. A cell phone works by communicating with the service network through a cell toweras base station. Cell towers divide a city into small areas,or cells. As a cell phone user drives down the street, the signal is handed from tower to tower. Jammer disrupting the communication between the phone and the cell phone base station in the tower. It’s called denial-of-service attack.
The jammer denies service of the radio spectrum to the cell phone users within range of the jamming device as shown in figure bellow.
Cell Phone Jamming Device
Jamming devices overpower the cell phone by transmitting a signal on the same frequency and at a high enough power that the two signals collide and cancel each other out.
Cell phones are designed to add power if they experience low-level interference, so the jammer must recognize and match the power increase from the phone. Cell phones are full-duplex devices, which means they use two separate frequencies, one for talking and one for listening simultaneously. Some jammers block only one of the frequencies used by cell phones, which has the effect of blocking both. The phone is tricked into thinking there is no service because it can receive only one of the frequencies. Less complex devices block only one group of frequencies, while sophisticated jammers can block several types of networks at once to head off dual-mode or tri-mode phones that automatically switch among different network types to find an open signal. Some of the high-end devices block all frequencies at once, and others can be tuned to specific frequencies.
How Cell Phone Jammers Work
Cell phone jammers work in a similar way to radio jammers by sending out the same radio frequencies that cell phones operate on. Doing so creates enough interference so that a call cannot connect with a cell phone. There are two types of cell phone jammers currently available. The first type are usually smaller devices that block the signals coming from cell phone towers to individual cell phones. The frequency blocked is somewhere between 800MHz and 1900MHz. Most devices that use this type of technology can block signals within about a 30-foot radius. Cell phones within this range simply show no signal. The second type of cell phone jammer is usually much larger in size and more powerful. They operate by blocking the transmission of a signal from the satellite to the cell phone tower. Some powerful models can block cell phone transmissions within a 5 mile radius. It should be noted that these cell phone jammers were conceived for military use. Once again, it should be noted that operating or even owning a cell phone jammer is illegal in most municipalities and specifically so in the United States. Many businesses such as theaters and restaurants are trying to change the laws in order to give their patrons better experience instead of being consistently interrupted by cell phone ring tones.
Conclusion
On observing the output of the frequency spectrum the VCO output is varies from 890MHz to 960MHz. This output is fed to MMG3001 and it is found that the mobile jammer blocks the mobile signal in 8-meter effective radius. All the circuit output are constructed and observed using the Electronic work bench. The simulation result and practical result are found to be approbatory equal. The gain of the project is that we are able to block communication coming into and going out from a GSM phone operating on the 890MHz to 960MHz frequency band. We are also able to reach 8-meter effective blocking radius and keep the cost less.
At last we can say every device is acts as good aspects as well as bad aspects. In many place cell phone jammer is useful but at many place it is a problem .for this we can take a example that if at any place cell phone jammer is on than anybody wants to use than there creates some problems.
[attachment=43058]
Abstract
The last few years have witnessed a dramatic boom in the wireless communications industry, hence increasing the number of users of mobile communication devices. This magnified the need for a more efficient and reliable signal scrambler. This paper deals with the Mobile Jamming Technology. The concept of jamming technology is studied in a step-by-step approach. The mobile jammer in the frequency range of 890MHz to 960MHz (GSM) is developed. Its circuit analysis simulation is performed using Speace-spice Software. Antenna simulation is done by using IE3D software [8]. The jammer circuit is designed with minimum cost and high efficiency.
The jammer jams the signal within five meter effective radius. Index terms– Antenna, Jammer, Wide band frequency.
History
The rapid proliferation of cell phones at the beginning of 21st century to near ubiquitous status eventually raised problems such as their potential use of invade privacy or contribute to rampant and egregious academic cheating. In addition public black lash privacy or contribute to rampant The rapid proliferation of cell phones at the beginning of the 21st century to near ubiquitous status eventually raised problems such as their potential use to invade privacy or contribute to rampant and egregious academic cheating. In addition public backlash was growing against the intrusive disruption cell phones introduced in daily life. While older analog cell phones often suffered from chronically poor reception and could even be disconnected by simple interference such as high frequency noise, increasingly sophisticated digital phones have led to more elaborate counters. Cell phone jamming devices are an alternative to more expensive measures against cell phones, such as Faraday cages, which are mostly suitable as built in protection for structures. They were originally developed for law enforcement and the military to interrupt communications by criminals and terrorists. Some were also designed to foil the use of certain remotely detonated explosives. The civilian applications were apparent, so over time many companies originally contracted to design jammers for government use switched over to sell these devices to private entities. Since then, there has been a slow but steady increase in their purchase and use, especially in major metropolitan areas.
Introduction to cell phone jammer
Cell phones are everywhere these days. According to the Cellular Telecommunications and Internet Association, almost 195 million people in the United States had cell-phone service in October 2005. And cell phones are even more ubiquitous in Europe. It's great to be able to call anyone at anytime. Unfortunately, restaurants, movie theaters, concerts, shopping malls and churches 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 intimate details 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. Cell phones are basically handheld two-way radios. And like any radio, the signal can be disrupted, or jammed.
4. Cell Phone Jamming Basics Disrupting a cell phone is the same as jamming any other type of radio communication. A cell phone works by communicating with the service network through a cell toweras base station. Cell towers divide a city into small areas,or cells. As a cell phone user drives down the street, the signal is handed from tower to tower. Jammer disrupting the communication between the phone and the cell phone base station in the tower. It’s called denial-of-service attack.
The jammer denies service of the radio spectrum to the cell phone users within range of the jamming device as shown in figure bellow.
Cell Phone Jamming Device
Jamming devices overpower the cell phone by transmitting a signal on the same frequency and at a high enough power that the two signals collide and cancel each other out.
Cell phones are designed to add power if they experience low-level interference, so the jammer must recognize and match the power increase from the phone. Cell phones are full-duplex devices, which means they use two separate frequencies, one for talking and one for listening simultaneously. Some jammers block only one of the frequencies used by cell phones, which has the effect of blocking both. The phone is tricked into thinking there is no service because it can receive only one of the frequencies. Less complex devices block only one group of frequencies, while sophisticated jammers can block several types of networks at once to head off dual-mode or tri-mode phones that automatically switch among different network types to find an open signal. Some of the high-end devices block all frequencies at once, and others can be tuned to specific frequencies.
How Cell Phone Jammers Work
Cell phone jammers work in a similar way to radio jammers by sending out the same radio frequencies that cell phones operate on. Doing so creates enough interference so that a call cannot connect with a cell phone. There are two types of cell phone jammers currently available. The first type are usually smaller devices that block the signals coming from cell phone towers to individual cell phones. The frequency blocked is somewhere between 800MHz and 1900MHz. Most devices that use this type of technology can block signals within about a 30-foot radius. Cell phones within this range simply show no signal. The second type of cell phone jammer is usually much larger in size and more powerful. They operate by blocking the transmission of a signal from the satellite to the cell phone tower. Some powerful models can block cell phone transmissions within a 5 mile radius. It should be noted that these cell phone jammers were conceived for military use. Once again, it should be noted that operating or even owning a cell phone jammer is illegal in most municipalities and specifically so in the United States. Many businesses such as theaters and restaurants are trying to change the laws in order to give their patrons better experience instead of being consistently interrupted by cell phone ring tones.
Conclusion
On observing the output of the frequency spectrum the VCO output is varies from 890MHz to 960MHz. This output is fed to MMG3001 and it is found that the mobile jammer blocks the mobile signal in 8-meter effective radius. All the circuit output are constructed and observed using the Electronic work bench. The simulation result and practical result are found to be approbatory equal. The gain of the project is that we are able to block communication coming into and going out from a GSM phone operating on the 890MHz to 960MHz frequency band. We are also able to reach 8-meter effective blocking radius and keep the cost less.
At last we can say every device is acts as good aspects as well as bad aspects. In many place cell phone jammer is useful but at many place it is a problem .for this we can take a example that if at any place cell phone jammer is on than anybody wants to use than there creates some problems.