This document discusses mobile phone jammers. It begins with an introduction to what a mobile jammer is and its history of use by law enforcement. It then describes four types of jamming techniques - Type A jammers, Type B intelligent cellular disablers, Type C intelligent beacon disablers, and Type D direct receive and transmit jammers. The document outlines the design and components of jammers, and lists some applications such as use in schools, prisons, hospitals and for security purposes. It concludes by noting both positive and negative aspects of jammer technology.

1.  Soumya Shuchi(14300211047)
 Srirupa Das(14300211048)
 Subhendu Paul(14300211050)
 Sumadhura Biswas(14300211051)
 Suman Bose(14300211052)
Presented by
1Dept. IT,GNIT

2.  What is mobile jammer?
 History
 How is works?
 Types of jamming techniques?
 Design parameter and specification
 Block diagram
 Types and application
 Future scope
 conclusion
2Dept. IT,GNIT

3.  A mobile phone jammer is an instrument used to
prevent cellular phones from receiving signals from
base stations.
3Dept. IT,GNIT

4.  Mobile jammer was originally developed for law
enforcement and the military to interrupt
communications by criminals and terrorists.
 Some were also designed to foil the use of certain
remotely detonated explosives.
4Dept. IT,GNIT

5.  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.
 This causes interference with
communication of cell phones
and towers to render the phones
unusable. On most phones,
the network would be out of
range.
5Dept. IT,GNIT

6.  Type "A" Device: JAMMERS
 Type “B” Device: INTELLIGENT CELLULAR DISABLERS
 Type “C” Device: INTELLIGENT BEACON DISABLERS
 Type “D” Device: DIRECT RECEIVE & TRANSMIT JAMMERS
6Dept. IT,GNIT

7. 1.Type "A" Device: JAMMERS
This type of device comes equipped with several
independent oscillators transmitting ‘jamming
signals’ capable of blocking frequencies used by
cellular systems for call establishment.
7Dept. IT,GNIT

8. 2.Type “B” Device: INTELLIGENT CELLULAR DISABLERS
 Unlike jammers, Type ”B” devices do not transmit an
interfering signal on the control channels. The device, when
located in a designated ’quite’ area, functions as a ’detector’.
 When the device detects the presence of a mobile phone in
the "silent" room; a prevention of authorization of call
establishment is done by the software at the base station.
8Dept. IT,GNIT

9. 3. Type “C” Device : INTELLIGENT BEACON DISABLERS
Unlike jammers, Type C devices do not transmit an
interfering signal on the control channels. The device, when
located in a designated ’quiet’ area, functions as a ’beacon’
and any compatible terminal is instructed to disable its
operation, while within the coverage area of beacon.
9Dept. IT,GNIT

10. 4. Type “D” Device : DIRECT RECEIVE & TRANSMIT JAMMERS
This jammer behaves like a small, independent and portable
base station, which can directly interact with the operation of
the local mobile phone. The jammer is predominantly in
receive mode and will intelligently choose to interact and
block the cell Phone directly if it is within close proximity of
the jammer.
10Dept. IT,GNIT

11.  The frequency band GSM 900 (935-960 MHz )
GSM 1800 (1805-1880 MHz)
 The distance to be jammed (R)
 Jamming–to-signal ratio
11Dept. IT,GNIT

12. Power Supply
•Transformer
•Rectification
•Filter
•Regulator
IF-Section
•Triangle wave
generator
•Noise generator
•Mixer summer
RF Section
•VCO
•Power
amplifier
•Antenna
12Dept. IT,GNIT

13.  Adjustable Mobile Jammer
 School &Prison Mobile Jammer
 Remote Control Mobile jammer
 Explosion – Proof Mobile jammer
 Police & Military Mobile Jammer
 Portable Mobile Jammer
13Dept. IT,GNIT

14. 14Dept. IT,GNIT

15.  To maintain the complete silence in library and
lecture hall.
 To avoid fraud in examination hall.
 To avoid disturbance in class room.
 For providing security in business conference, board
of directors rooms, seminars, etc.
15Dept. IT,GNIT

16.  Church/Cathedral/Temple/Religious establishment.
 For providing calm and peaceful atmosphere in
Hospitals.
 And mostly in security purpose.
16Dept. IT,GNIT

17.  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.
17Dept. IT,GNIT

18.  Every technology has good aspect as well as bad
aspect, the important thing is, how we are using it.
 Cell phone jammers are very useful to the society
from the anti-social elements.
 Cell phone jammers prevent the students from using
cell phones to the schools and colleges.
18Dept. IT,GNIT

19.  www.google.com
 www.wikipedia.com
 www.jammer.in
19Dept. IT,GNIT