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Cellphonejammerppt 101216030013-phpapp01
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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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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