Cell Phone JammerCell Phone Jammer Sick of cell phones? Then jam them!Sick of cell phones? Then jam them!

WHAT IS JAMMER ?WHAT IS JAMMER ?

Jammer are the device by which we Jammer are the device by which we can creat a temporary “dead zone”in can creat a temporary “dead zone”in there immediate proxcimity.there immediate proxcimity.

There are three type of jammer .There are three type of jammer .• Radar jammer Radar jammer • Radio jammerRadio jammer• Cell phone jammerCell phone jammer

INTRODUCTIONINTRODUCTION A cell phone jammer is an instrument A cell phone jammer is an instrument

used to prevent cellular phones from used to prevent cellular phones from receiving and transmitting the mobile receiving and transmitting the mobile signals to a base station. When used, signals to a base station. When used, the jammer effectively disables the jammer effectively disables cellular phones in the areacellular phones in the area..

JAMMING BASICSJAMMING BASICS

A jamming device transmits on the A jamming device transmits on the same radio frequencies as the cell same radio frequencies as the cell phone, disrupting the communication phone, disrupting the communication between the phone and the cell-between the phone and the cell-phone base station in the tower. It's phone base station in the tower. It's a called a a called a denial-of-service attackdenial-of-service attack. . The jammer denies service of the The jammer denies service of the radio spectrum to the cell-phone radio spectrum to the cell-phone users within range of the jamming users within range of the jamming devicedevice. .

JAMMING BASICSJAMMING BASICS

HOW THE JAMMER WORKHOW THE JAMMER WORK Jammers block cell phone use by sending out Jammers block cell phone use by sending out

radio waves along the same frequencies that radio waves along the same frequencies that cellular phones use at a high enough power that cellular phones use at a high enough power that the two signals collide and cancel each other out. the two signals collide and cancel each other out.

This causes interference with the This causes interference with the communication of cell phones communication of cell phones and the towers to render.the phones and the towers to render.the phones unusableunusable. . On most phones, the On most phones, the network would appear out of range.network would appear out of range.

SoSo Jammers work by either disrupting Jammers work by either disrupting phone to tower frequencies or tower phone to tower frequencies or tower to phone frequencies to phone frequencies. .

INSIDE A JAMMERINSIDE A JAMMER

ANTENNA :ANTENNA : Every jamming device has an Every jamming device has an

antenna to send the signal. Some are antenna to send the signal. Some are contained within an electrical contained within an electrical cabinet. On stronger devices, cabinet. On stronger devices, antennas are external to provide antennas are external to provide longer range and may be tuned for longer range and may be tuned for individual frequencies.individual frequencies.

Cont…Cont… Power supplyPower supply

Smaller jamming devices are battery operated. Some look Smaller jamming devices are battery operated. Some look like cell phone and use cell-phone batteries. Stronger devices like cell phone and use cell-phone batteries. Stronger devices are plugged into a standard outlet or wired into a vehicle's are plugged into a standard outlet or wired into a vehicle's electrical system.electrical system.

CircuitryCircuitry

The main electronic components of a jammer are:The main electronic components of a jammer are:

Voltage-controlled oscillatorVoltage-controlled oscillator - Generates the radio signal - Generates the radio signal that will interfere with the cell phone signalthat will interfere with the cell phone signal

Tuning circuitTuning circuit - Controls the frequency at which the jammer - Controls the frequency at which the jammer broadcasts its signal by sending a particular voltage to the broadcasts its signal by sending a particular voltage to the oscillator oscillator

WHY ARE JAMMERS USED?WHY ARE JAMMERS USED?

A phone jammer provides the ultimate solution in A phone jammer provides the ultimate solution in any area where cellular communications any area where cellular communications frequently cause nuisance either by loud frequently cause nuisance either by loud incoming call rings or resulting loud telephone incoming call rings or resulting loud telephone conversations. conversations.

Cell phone jamming devices were originally Cell phone jamming devices were originally developed for law enforcement and the military developed for law enforcement and the military to interrupt communications by criminals and to interrupt communications by criminals and terrorists. Examples terrorists. Examples include:securityzonespublictransport,include:securityzonespublictransport,,,classroomsclassrooms, , temples,tv & radio temples,tv & radio stations,jails,govt.buildings,military stations,jails,govt.buildings,military bases,industries etcbases,industries etc.    .   

Cont…Cont…

During a hostage situation, police can During a hostage situation, police can control when and where a captor can control when and where a captor can make a phone call. Police can block phone make a phone call. Police can block phone calls during a drug raid so suspects can't calls during a drug raid so suspects can't communicate outside the area. communicate outside the area.

Corporations use jammers to stop Corporations use jammers to stop corporate espionage by blocking voice corporate espionage by blocking voice transmissions and photo transmissions transmissions and photo transmissions from camera phones. from camera phones.

SIZE OF A JAMMERSIZE OF A JAMMER Some cell-phone jammers are made to look like Some cell-phone jammers are made to look like

actual phones. Others are briefcase-sized or actual phones. Others are briefcase-sized or larger. The biggest jammers used by police and larger. The biggest jammers used by police and the military can be mounted in vehicles for the military can be mounted in vehicles for convoy security.convoy security.

Digital, portable cellphone jammer designed for military and police use

A big jammer A portable jammer

RANGE OF A JAMMERRANGE OF A JAMMER

Most jammers only have a range of about Most jammers only have a range of about 50 to 80 feet and will only effectively jam 50 to 80 feet and will only effectively jam your immediate surroundings. Low-your immediate surroundings. Low-powered jammers block calls in a range of powered jammers block calls in a range of about 30 feet (9 m). about 30 feet (9 m).

Higher-powered units create a cell-free Higher-powered units create a cell-free zone as large as a football field. Units used zone as large as a football field. Units used by law enforcement can shut down service by law enforcement can shut down service up to 1 mile (1.6 km) from up to 1 mile (1.6 km) from the device.the device.

Cont…Cont…

They are available They are available to cover large to cover large structures like office structures like office buildings, theaters buildings, theaters and churches. and churches. They look like a They look like a miscellaneous box miscellaneous box with wires with wires sticking out & are usually sticking out & are usually mounted on walls mounted on walls or ceilingsor ceilings

ADVANTAGESADVANTAGES

They can in theory interfere with They can in theory interfere with emergency communications between emergency communications between police and rescue personnelpolice and rescue personnel

It also represents a It also represents a safety hazardsafety hazard because jamming blocks all calls in because jamming blocks all calls in the area, not just the annoying ones.the area, not just the annoying ones.

DISADVANTAGESDISADVANTAGES

Jammers can be used by criminals Jammers can be used by criminals who break into houses.who break into houses.

There are concerns that crudely There are concerns that crudely designed jammers may disrupt the designed jammers may disrupt the functioning of medical devices such functioning of medical devices such as pacemakers .as pacemakers .

ALTERNATIVESALTERNATIVES While the law clearly prohibits using a device to While the law clearly prohibits using a device to

actively disrupt a cell-phone signal, there are no actively disrupt a cell-phone signal, there are no rules against passive cell-phone blocking. rules against passive cell-phone blocking.

Companies are working on devices that Companies are working on devices that control a control a cell phonecell phone but do not "jam the signal." One but do not "jam the signal." One device sends incoming calls to voicemail and device sends incoming calls to voicemail and blocks outgoing calls. The argument is that the blocks outgoing calls. The argument is that the phone still works, so it is technically not being phone still works, so it is technically not being jammed. jammed.

Cell-phone alertersCell-phone alerters are available that indicate are available that indicate the presence of a cell-phone signal. These have the presence of a cell-phone signal. These have been used in hospitals where cell-phone signals been used in hospitals where cell-phone signals could interfere with sensitive medical equipment. could interfere with sensitive medical equipment. When a signal is detected, users are asked to turn When a signal is detected, users are asked to turn off their phones. off their phones.

CONCLUSIONCONCLUSION Every technology has good aspect as well as bad Every technology has good aspect as well as bad

aspectaspect the important thing is ,how we are using it.the important thing is ,how we are using it.

Maybe someday governments will relax their Maybe someday governments will relax their restrictions on jammers and they will become restrictions on jammers and they will become standard in places like churches, movie theaters standard in places like churches, movie theaters and courthouses. Until then, only government and courthouses. Until then, only government personnel. and outlaw jammers will be able to personnel. and outlaw jammers will be able to enjoy some peace and quiet at the movie theater enjoy some peace and quiet at the movie theater or the ride via public transportation to work or the ride via public transportation to work

THANK YOUTHANK YOU

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