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JAMMING DEVICES
PRESENTED BYTANZIHA REHMAN
2WHAT IS A JAMMERWHY ARE JAMMER USEDSIZE OF A JAMMERJAMMER BASICSTYPES OF JAMMING DEVICESHOW JAMMER WORKSCOMPONENTS OF A JAMMERREMOTE JAMMERSRANGE OF A JAMMERLEGAL ISSUESFUTURE ENHANCEMENTCONCLUSIONFAQ’S
TABLE OF CONTENTS
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What is Jammer?
Cell phone jammers are devices that create a temporary "dead zone" to all cell phone traffic in their immediate proximity.It is an instrument used to prevent cellular phones from receiving and transmitting the mobile signals to a base station.Other types of jammers include radar jammer and radio jammer , remote control mobile jammer and laser jammers.
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Why Are Jammer Used?
A cell phone jammer provides the ultimate solution in any area where cellular communications frequently cause nuisance either by loud incoming call rings or resulting loud telephone conversations.Cell phone jamming devices were originally developed for law enforcement and the military to interrupt communications by criminals and terrorists. Examples include: security zones, public transport, classrooms, temples, TV & radio stations, jails, govt. buildings, military bases, industries etc.
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6Size Of A Jammer• Some cell-phone jammers are made to look like actual phones. •Others are briefcase-sized or larger. •The biggest jammers used by police and the military can be mounted in vehicles for convoy security.
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JAMMING BASICS
A cell phone works by communicating with its service network through a cell tower or 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.
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WORKING OF JAMMING DEVICE
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 in the tower. It's a called a denial-of-service
attack.
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JAMMING TECHNIQUES
Type A Simple JammerType B Intelligent Cellular DisablersType C Intelligent Beacon DisablersType D Direct Receive Transmit JammersType E EMI Shield - Passive Jamming
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TYPE ‘A’ SIMPLE JAMMER
Type ”A” Devices are simple Jammer. This type of device comes equipped with numerous independent oscillators transmitting jamming signals capable of blocking frequencies used by paging devices as well as those used by cellular systems manage channels for call establishment.
12TYPE ‘B’INTELLIGENT CELLULAR DISABLERS
Type ”B” Devices are also known as INTELLIGENT CELLULAR DISABLERS. Contrasting jammers, Type B devices do not transmit an interfering signal on the control channels. The device, when situated in a designated quite area, functions as a detector. It has a unique identification number for communicating with the cellular base station.
13TYPE ‘C’ INTELLIGENT BEACON DISABLERS
Type ”C” Devices are also known as Intelligent Beacon Disablers. Contrasting jammers, Type C devices do not transmit an interfering signal on the control channels. The device, when located in a designated quiet area, functions as a beacon and any compatible terminal is instructed to disable its ringer or disable its operation, while within the coverage area of beacon.
14TYPE ‘D’ DIRECT RECEIVE TRANSMIT JAMMERS
Type ”D” Devices are Direct Receive Transmit Jammers. This jammer behaves like a small, independent and portable base station, which can directly interact intelligently or unintelligently with the operation of the local mobile phone. The jammer is principally in receive mode and will intelligently choose to interact and block the cell Phone directly if it is within close proximity of the jammer.
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TYPE ‘E’ EMI SHEILD PASSIVE JAMMING
Type ”E” Devices are used for EMI Shield - Passive Jamming. This technique is using EMI suppression techniques to make a room into what is called Faraday cage. Although labor intensive to construct, the Faraday cage essentially Blocks or greatly reduce , practically all electromagnetic radiation from entering or leaving the cage - or in this case a target room.
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How Jammer works?´´´
Jammers block cell phone use by sending out radio waves along the same frequencies that cellular phones use at a high enough power that the two signals collide and cancel each other out. This causes interference with the communication of cell phones and the towers to render the phones unusable. On most phones, the network would appear out of range. So Jammers work by either disrupting phone to tower frequencies or tower to phone frequencies.
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INSIDE JAMMER
Cell-phone jammers are very basic devices. The simplest just have an on/off switch and a light that indicates it's on. Components of a jammer include:´ Antenna :Every jamming device has an antenna to send the signal. Some are contained within an electrical cabinet. On stronger devices, antennas are external to provide longer range and may be tuned for individual frequencies.´ Power supply :Smaller jamming devices are battery operated. Some look like cell phone and use cell-phone batteries. Stronger devices are plugged into a standard outlet or wired into a vehicle's electrical system.
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INSIDE JAMMER
Circuitry - The main electronic components of a jammer are:´ Voltage-controlled oscillator - Generates the radio signal that will interfere with the cell phone signal.´ Tuning circuit - Controls the frequency at which the jammer broadcasts its signal by sending a particular voltage to the oscillator.´ Noise generator - Produces random electronic output in a specified frequency range to jam the cell-phone network signal (part of the tuning circuit).´ RF amplification (gain stage) - Boosts the power of the radio frequency output to high enough levels to jam a signal.
20REMOTE JAMMER
JAMMERS CAN be fitted inside the car or any vehicle… if in any area during war jammer cant be fitted , remote jammer is the answer… to block the signals.
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RANGE OF A JAMMER
Higher-powered units create a cell-free zone as large as afootball field. Units used by law enforcement can shut downservice up to 1 mile (1.6 km) from the device. They areavailable to cover large structures like officebuildings, theaters and churches.They look like a miscellaneous boxwith wires sticking out & are usuallymounted on walls or ceilings.
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LEGALISSUES
With the exception of Asian countries blocking cell-phoneservices by the general public is against the law in mostcountries like The United States, United Kingdom, Australia.Governments are trying to make the best possible use ofjammers and planning to relax their restrictions on usingthem in standard places like churches, movie theaters andcourthouses.
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FUTURE ENHANCEMENT
While the law clearly prohibits using a device to activelydisrupt a cell-phone signal, there are no rules against passivecell-phone blocking.Companies are working on devices that control a cell phonebut do not ³jam the signal´.Cell-phone alerter are available that indicate the presenceof a cell-phone signal. These have been used in hospitalswhere cell-phone signals could interfere with sensitivemedical equipment. When a signal is detected, users areasked to turn off their phones.
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CONCLUSION.
You certainly wouldn't want someone's jammer blocking aphone call to 100, you're trying to make. For example, ajammer hypothetically could be used by criminals who breakinto homes and want to prevent any calls for help. However,jammers can also be used for good.Maybe someday governments will relax their restrictions onjammers and they will become standard in places likechurches, movie theaters and courthouses. Until then, onlygovernment personnel and outlaw jammers will be able toenjoy some peace and quiet at the movie theater or the ridevia public transportation to work.
FAQ’S
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THANK YOU
