CELL PHONE JAMMERPresented by:-Name- Aditya Kumar TripathyRegd. No.- 1241019150Section- A

CONTENTS• Introduction• Jamming Techniques.•Design Parameters.•Components of the Jammer device.•How mobile Jammer works?•Applications.•Conclusion.

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INTRODUCTION• Cell phones are everywhere these days. According to the Cellular

Telecommunications and Internet Association, approx. 1000 million people in India had cell-phone service. • Due to wide use of mobile phones it creates some problems as

the sound of ringing becomes annoying or disrupting. • A cell phone jammer is a device that blocks transmission or

reception of signals, usually by creating some form of interference at the same frequency ranges that cell phones use.• As a result, a cell phone user will either lose the signal or

experience a significant loss of signal quality.3

IMAGE

Mobile jammer blocking signals in a meeting. Image courtesy: [1]

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JAMMING TECHNIQUES1. Spoofing.2. Shielding Attacks.3. Denial of Service .

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DESIGN PARAMETERS1. Distance to be Jammed(D).2. Frequency Bands.

3. Jamming-to-signal ratio{J/S} :-• Jamming is successful when the jamming signal denies the

usability of the communication transmission.

UPLINK DOWNLINKGSM 900 890-915 MHz 935-960 MHz

GSM/DCS 1800 1710-1785 MHz 1805-1880 MHz

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DESIGN PARAMETERS (Continued)

• A successful jamming attack requires that the jammer power is roughly equal to signal power at the receiver (mobile device). • The general equation of the jamming-to-signal ratio is

given as follows:

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DESIGN PARAMETERS (Continued)

4. Free space loss {F}:The free-space loss (or path loss) is given by:

Path loss (db) = 32.44 + 20 log d (km) + 20 log f (MHz).

• The maximum free space loss (worst case F) happens when the maximum frequency is used in the above equation.

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COMPONENTS OF THE JAMMER 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)Jammer consists of 3 main blocks.

Power Supply

IF- Section

RF- Section

JammingSignal

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COMPONENTS (Continued)1. The IF-Section :-i. Triangle wave generator.ii. Noise generator.iii. Mixer “Summer”.

2.The RF-Section :-i. The voltage controlled oscillator(VCO).ii. The power amplifier.iii. The antenna.

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HOW CELL PHONE JAMMER 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. • 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.12

HOW JAMMER WORK ? (Continued)

Image courtesy: [1]13

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HOW JAMMER WORK ? (Continued)

Mobile phone intelligent jamming system block diagram

Triangular wave Gen.

Noise Gen.

MIXER VCO

MobileDetector

PIC16F84Power Amp.

Power Amp

SynthesizerRF

Switch

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APPLICATIONS1. To maintain the complete silence in library and lecture hall2. To avoid fraud in examination hall.3. To avoid disturbance in class room.4. For providing security in business conference, board of directors rooms,

seminars, etc., 5. For providing calm and peaceful atmosphere in Hospitals 6. The jammer also stops Internet use through Wi-Fi network and even blocks

Bluetooth connections.7. The cell phone signal jammer also puts an end to text messaging, so students

cannot SMS each other, while the teacher is trying to teach.

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FUTURE SCOPE•While the law clearly prohibits using a device to actively disrupt a cell-phone signal, there are no rules against passive cell-phone blocking.

•Companies are working on devices that control a cell phone but do not "jam the signal.

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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 countries. • 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. 18

REFRENCES[1] Ibrahim Patel, Ragha vedra Kulkarni, Junaid Ali Khan, “INTELLIGENT FM SIGNAL JAMMING SYSTEM”,IEEE Third International Conference on Computing, Communication and Networking Technologies (ICCCNT'12),26th - 28th July 2012.

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