1. Cell Phone Jammer
RONSON CALVIN FERNANDES
Mail To : ronson425@gmail.com
110919053
MIT – MANIPAL
11/18/2013
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2. Contents
 Introduction
 Cell Phone Jamming device
 How Cell Phone Jamming Works
 Types Of Jammer Device
 Applications of Cell Phone Jamming
 Legal Issues related to Cell Phone Jamming
 Conclusion
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3. Introduction
 Cell phone jammers are devices that create a temporary "dead zone" to all cell
phone traffic in their immediate proximity.
 A jamming device transmits - same radio frequencies of greater power as the
cell phone, disrupting the communication between the phone and the cellphone base station in the tower.
 It's a called a denial-of-service attack.
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4. Introduction ( Continued . . )
 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
tower as base station.
 Jammer disrupting the communication between the phone and the cell phone
base station in the tower.
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5. Cell Phone Jamming Device
 Jamming devices overpower the cell phone by transmitting a signal on the
same frequency.
 Power of the signal should be high enough so that the two signals collide and
cancel each other out.
 The phone is tricked into thinking there is no service because it can receive
only one of the frequencies.
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6. Jamming Device ( Continued . . )
 Less complex devices block only one group of frequencies, Some of the high-
end devices block all frequencies at once.
 Low-powered jammers block calls in a range of about
30 feet (9 m).
 Higher - powered units - as large as a football field.
 Law enforcement jammer units - up to 1 mile
(1.6 km) from the device.
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7. Components of Jamming Device
 The simplest just have an on/off switch and a light that indicates it's on.
 Complex devices have switches to activate jamming at different frequencies.
 Main Components :
 Power Supply
 Circuitry
 Antenna
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8. Components ( Continued . . )
Circuitry
The main electronic components of a jammer are:
 Voltage-controlled oscillator
 Tuning circuit
 Noise generator
 RF amplification
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9. 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.
 This creates enough interference so that a call cannot connect with a cellphone.
 2 types of jammers. The first type are usually smaller devices that block the
signals coming from cell phone towers to individual cell phones.
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10. How Jammers Work ? (
Continued . . )
 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.
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11. How Jammers Work ? (
Continued . . )
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12. Types of cell phone jammer device
 Cell Phone Jammer
 Portable Cell Phone Jammer
 Remote Control Cell Phone Jammer
 Adjustable Cell Phone Jammer
 School & Prison Phone Jammer
 Explosion - Proof Cell Phone Jammer
 Police & Military Phone Jammer
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13. Applications of Cell Phone
Jamming
 Cell phone jamming devices were originally developed for law enforcement
and the military to interrupt communications by criminals and terrorists.
 During a hostage situation or drug raid police can control when and where a
captor can make a phone call.
 Cell-phone jammers can be used in areas where radio transmissions are
dangerous.
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14. Applications ( Continued . . )
 Corporations use jammers to stop corporate espionage by blocking voice
transmissions and photo transmissions from camera phones.
 Can be used in the areas like Schools or Academic areas , Exam centers ,
Medical facilities , Public libraries.
 Can be used in Govt. offices and High security areas like Prisons , Courts ,
Scientific research labs and Military facilities.
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15. Cell Phone Jamming Legal Issues
 Cell phone jammers are illegal in most countries — except to military, law
enforcement and certain governmental agencies.
 It’s a “Property Theft”.
 It also represents a “Safety Hazard”.
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16. Legal Issues ( Continued . . )
 In India - legal, Government, Religious Places, Prisons and Educational
Institutions use jammers
 India has installed jammers in parliament and some prisons.
 It has been reported that universities in Italy have adopted the technology to
prevent cheating. Students were taking photos of tests with their camera
phones and sending them to classmates.
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17. Conclusion
 We can say every device is acts as good aspects as well as bad aspects.
 Operating or even owning a cell phone jammer is illegal in most municipalities
and specifically so in the United States.
 Jamming is seen as Property Theft, Safety Hazard.
 In many place cell phone jammer is useful but at many place it is a problem .
 But it’s overall performance is very good and helpful in our life.
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18. References
[1] "Zone of silence [cell phone jammer]," Spectrum, IEEE , vol.42, no.5, 18,
May 2005
[2] Sami Azzam, Ahmad Hijazi, Ali Mahmoudy. ”Smart Jammer for mobile phone
systems”
[3] Mobile & Personal Communications Committee of the Radio Advisory Board of
Canada, “Use of jammer and disabler Devices for blocking PCS, Cellular & Related
Services”
[4] www.HowStuffWork.com
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