MOBILE JAMMERS

Submitted By:

PVS Soumya [2/4] Sai Nandini T [2/4]

GNITS GNITS

Contents

• Introduction• Basic Principle• Types of mobile Jamming• Mobile Jamming Requirements• Components of GSM Mobile Jammer• Applications• Advantages• Conclusion

MOBILE A BIG NUISANCE

Polite requests asking people to put their mobiles ‘away’

but many people don’t care looking at

Basic Principle

GSM 900

• Global System For Mobiles• Spectrum range: 890Mhz - 915MHz [uplink] 935Mhz 960MHz [downlink]• Introduced 2G mobiles• Security, Quality, Capacity and ability to

support IC’s• Short message service [SMS]

Types of Jammers

• Type A -large number of oscillators -interferes large amount of communication spectrum

• Type B -”Intelligent Cellular Disabler Devices” -detectors communicate with Base Station -prevent the authorization of call establishment

• Type C

-”Intelligent Beacon Disablers”

-compatible terminal is disabled

-eg. blue tooth technology

• Type D

-jammer with a receiver

-jams the signal only when there is link between the base station and the mobile

-less electromagnetic pollution

• Type E

-Faraday’s cage- blocks virtually all the EM waves

-EMI sheilding techniques

- EMI - Electro Magnetic Interface

-”quiet conference rooms”

Minimum Requirements of Mobile Jamming

• Jammer power= signal power at the receive

• Jamming to signal ratio (J/S)• Distance between jammer and

receiver

Frequency Hopping

Frequency Hopping

Components of Mobile Jammer

• RF Section• Power supply• IF Section

RF SECTION

VCO RF POWERAMPLIFIER

ANTENNA

IF SECTION

NOISE GENERATOR

SIGNALMIXER

Power Supply

TRANSFORMER

RECTIFIER

FILTER

REGULATOR+5V

REGULATOR+9V

REGULATOR-9V

Applications

• Hostage Situations• During Drug raid• In potentially explosive areas

A Pocket Sized Jammer

4 Frequency Band Jammer

Military Jammers

Very High Power Jammers

Conclusions

• High power and low power jammers

• Variation in sizes

• Easy to handle