1. By
Shishu Priya Darshi
2007EEC08
Naresh Prasad
2007EEC67
Department of Electronics & Communication Engineering
Shri Mata Vaishno Devi University, Katra
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2. Contents
 Introduction
 Types of Jammer
 How Jammer Works
 What inside Jammer
 Applications of Jammer
 Future scope of Jamming Technology
 Cell Phone Detector Introduction
 Block Diagram
 Application
 Conclusion
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3. Cell phone jammers are devices that create a
temporary "dead zone" to all cell phone traffic in
their immediate proximity
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4. Jamming techniques
 Type "A" Device: JAMMERS
 Type “B” Device: INTELLIGENT CELLULAR DISABLERS
 Type “C” Device: INTELLIGENT BEACON DISABLERS
 Type “D” Device: DIRECT RECEIVE & TRANSMIT JAMMERS
 Type “E” Device: EMI SHIELD - PASSIVE JAMMING
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5. How 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.
.....Jamming basics....
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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. Design Parameters/ Specification
The frequency bands
Distance to be jammed (D)
Pj Gjr Grj R2tr Lr Br
Jamming–to-signal ratio {J/S}=
Pt Gtr Grt R2jr Lj Bj
Free space loss {F}= Path Loss (dB)= 32.44 + 20 log D(km) + 20log f(MHz)
Power calculations
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8. Block Diagram
Jamming
Power supply If section Rf section
signals
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9. Power supply
Transformer
Rectifier filter Regulator
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10. IF section
Triangular wave
Mixer summer
generator Noise generator
“Summer”
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11. Rf section
Voltage
Controlled Power Amplifier Antenna
Oscillator
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12. Application
 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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13. Future scope of Jamming Technology
 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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14. Cell phone detector
Introduction
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15. Block Diagram
Power I.F RF
Signal
Supply Section Section
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16. Applications
 Cell-phone alerter (detector) is useful that
indicate the presence of a cell-phone signal. These
can be used in hospitals where cell-phone signals
could interfere with sensitive medical equipment.
When a signal is detected, users are asked to turn
off their phones or Jamming can be used.
 It is useful airport.
 It is useful in class rooms and examination hall.
 It is useful wherever cell phone can disturb.
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17. Conclusion
 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 cell phone jammers. Cell phone jammers prevent the
students from carrying cell phones to the colleges. As every thing
goes fine, it is very necessary to implement in all the colleges
References
 [1] www.HowStuffWorks.com
 [2] en.wikipedia.org/wiki/Mobile_phone_jammer
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18. QUERIES
QUERIES
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19. THANK YOU
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