Le402 Cellphone Jammers

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Transcript of Le402 Cellphone Jammers

By

M. Swapna 09J95a0402

1

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 ConclusionShri Mata Vaishno Devi University, Katra 2

Cell phone jammers are devices that create a temporary "dead zone" to all cell phone traffic in their immediate proximity

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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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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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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.Shri Mata Vaishno Devi University, Katra 6

Design Parameters/ SpecificationThe frequency bands Distance to be jammed (D) Pj Gjr Grj R2tr Lr Br Jammingto-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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Block Diagram

Power supply

If section

Rf section

Jamming signals

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Power supply

Transformer

Rectifier

filter

Regulator

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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 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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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 detectorIntroduction

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Block DiagramPower Supply I.F Section RF Section

Signal

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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.Shri Mata Vaishno Devi University, Katra 16

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_jammerShri Mata Vaishno Devi University, Katra 17

QUERIES QUERIES

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THANK YOU

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