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Cell Phone Jammer

RONSON CALVIN FERNANDES

110919053

MIT – MANIPAL

Mail To : ronson425@gmail.com

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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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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 cell-

phone base station in the tower.

It's a called a denial-of-service attack.

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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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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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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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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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Components ( Continued . . )

Circuitry

The main electronic components of a jammer are:

Voltage-controlled oscillator Tuning circuit Noise generator RF amplification

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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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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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How Jammers Work ? ( Continued . . )

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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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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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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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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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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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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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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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