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 Conclusion 2Shri Mata Vaishno Devi University, Katra

Cell phone jammers are devices that create a temporary "dead zone" to all cell phone traffic in their immediate proximity 3Shri Mata Vaishno Devi University, Katra

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 4Shri Mata Vaishno Devi University, Katra

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.... 5Shri Mata Vaishno Devi University, Katra

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. 6Shri Mata Vaishno Devi University, Katra

Design Parameters/ Specification Free space loss {F}= Path Loss (dB)= log D(km) + 20log f(MHz) The frequency bands Distance to be jammed (D) P j G jr G rj R 2 tr L r B r Jamming–to-signal ratio {J/S}= P t G tr G rt R 2 jr L j B j Power calculations 7Shri Mata Vaishno Devi University, Katra

Block Diagram If sectionRf section Jamming signals Power supply 8Shri Mata Vaishno Devi University, Katra

Power supply Transformer RectifierRegulator 9Shri Mata Vaishno Devi University, Katra filter

IF section Triangular wave generatorNoise generator Mixer summer “Summer” 10Shri Mata Vaishno Devi University, Katra

Rf section Voltage Controlled Oscillator Power AmplifierAntenna 11Shri Mata Vaishno Devi University, Katra

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 12Shri Mata Vaishno Devi University, Katra

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. Shri Mata Vaishno Devi University, Katra13

Cell phone detector Introduction Shri Mata Vaishno Devi University, Katra14

Block Diagram Power Supply I.F Section RF Section Signal 15Shri Mata Vaishno Devi University, Katra

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, Katra16

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] [2] en.wikipedia.org/wiki/Mobile_phone_jammer Shri Mata Vaishno Devi University, Katra17

QUERIES Shri Mata Vaishno Devi University, Katra18

Shri Mata Vaishno Devi University, Katra19