Future lies upon it

1. Presented By :-
Prejith Pavanan
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2.  Introduction
 History
 How Mobile Jammer work?
 How Intelligent Jammer works?
 Block Diagram.
 Circuit Diagram
 Advantages
 Disadvantages
 Application
 Future scope of Jamming Technology
 Conclusion
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3.  A mobile phone jammer is an instrument used to
prevent cellular phones from receiving signals
from base stations.
 It is a device that transmit signal on the same
frequency at which the GSM system operates, the
jamming success when the mobile phones in the area
where the jammer is located are disabled.
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4.  Mobile Jammer were originally developed for law
enforcement and the military to interrupt
communications by criminals and terrorists.
 This device can is used by bomb squad for diffusing
bombs. This is because most of the bombs now a day
are triggered by the use of cell phones.
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How Mobile jammer works
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.

6.  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.
 So Jammers work by either disrupting phone to
tower freq.. or tower to phone frequencies.
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7.  An intelligent jammer has a detector ckt in it. It is this unit
that detect the presence of a cell phone.
 When the detector ckt is triggered it automatically triggers
the jammer ckt.
 After the jammer is on the communication is blocked and
the cell phone will be inactive.
 The detector is implemented with an LED which is used
to indicate the presence of a cell phone in its range.
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8. Mobile
Detector
RF Section
IF Section

9. RF
Antenna
CE
Amplifier
Timer
circuit
LED

10. Battery Oscillator
Tuning
Circuit
Noise
generator
Amplifier Antenna

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14.  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.,
 For providing calm and peaceful atmosphere in
Hospitals
 Church/Mosques/Cathedral/Temple/Religious
establishment
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15.  Now a day, copying in examination, wiretap, gas
station outburst, and medical negligence are taking
place due to mobile phones.
 Other important use is that this devise can be used by
bomb squad for diffusing bombs. This is because most
of the bombs now a day are triggered by the use of cell
phones.

16.  You are paying for the usage of a specific service. Use
of jammers might prevent you from using a service
after paying for that
 You cannot call the emergency help-line numbers.
 This system may be utilized by the criminals to take
advantage of others.

17.  While the law clearly prohibits using a device
to actively disrupt a cell-phone signal, and the
lawbreakers will be given severe penalty
 Companies are working on devices that
control a cell phone but do not "jam the
signal.
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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. We can
save our national leaders. we can restrict the
communication network between the anti-social
elements by using the Mobile jammers.
Cell phone jammers prevent the students from
carrying cell phones to the colleges.
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