Post on 28-Jan-2015
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Cell Phone Jammer Incorporated with Cell Phone Detector
ByShishu Priya Darshi
2007EEC08Naresh Prasad
2007EEC67
Department of Electronics & Communication Engineering
Shri Mata Vaishno Devi University, Katra
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ContentsIntroductionTypes of JammerHow Jammer WorksWhat inside JammerApplications of JammerFuture scope of Jamming TechnologyCell Phone Detector IntroductionBlock DiagramApplicationConclusion
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IntroductionCell phone jammers are devices that create a temporary "dead zone" to all cell phone traffic in their immediate proximity
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Jamming techniquesType "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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How Jammer WorksA 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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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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Design Parameters/ Specification
Free space loss {F}= Path Loss (dB)= 32.44 + 20 log D(km) + 20log f(MHz)
The frequency bands
Distance to be jammed (D)
Pj Gjr Grj R2tr Lr Br
Jamming–to-signal ratio {J/S}= Pt Gtr Grt R2
jr Lj Bj
Power calculations
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Block Diagram
If section Rf sectionJamming signals
Power supply
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Power supply
TransformerRectifier Regulatorfilter
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IF section
Triangular wave generator Noise generator
Mixer summer “Summer”
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Rf section
Voltage Controlled Oscillator
Power Amplifier
Antenna
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Application
To maintain the complete silence in library and lecture hall
To avoid fraud in examination hallTo avoid disturbance in class roomFor 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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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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Cell phone detector
Introduction
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Block Diagram
Power
Supply
I.F Secti
on
RF Secti
on
Signal
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ApplicationsCell-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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ConclusionEvery 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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QUERIESQUERI ES
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THANK YOU