Transcript MOBILE JAMMERS Submitted By: PVS Soumya [2/4] GNITS Sai Nandini T [2/4] GNITS Contents • • • • • • • • Introduction Basic Principle Types of mobile Jamming Mobile Jamming Requirements Components of GSM Mobile Jammer Applications Advantages Conclusion.

MOBILE JAMMERS
Submitted By:
PVS Soumya [2/4]
GNITS
Sai Nandini T [2/4]
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 POWER
AMPLIFIER
ANTENNA
IF
SECTION
NOISE
GENERATOR
SIGNAL
MIXER
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