Topic:Mobile Signal jammer

Group: 05Group Members:

Name AIUB ID

Rahman Md. Jubayer 12-20824-1Puspita Shaha 12-20840-1

Hossain Bayezid 12-20427-1Rahman Afroza 12-20371-1

Sazid Hosni Mubarak 12-20426-1

Faculty: RETHWAN FAIZ

Content:

Mobile Signal Jammer Type of Jammer How Jammer Works Block Diagram Circuit Design Legality Application Conclusion Reference

Mobile Signal jammer:A mobile phone jammer is an instrument used to prevent cellular phones from receiving signals from base stations. When used, the jammer effectively disables cellular phones. These devices can be used in practically any location, but are found primarily in places where a phone call would be particularly disruptive because silence is expected.

Type of jammer:There are two type of cell phone jammer.

GSM Jammer CDMA jammer

Jamming devices overpower the cell phone by transmitting a signal on the same frequency as the cell phone and at a high enough power that the two signals collide and cancel each other out. To jam a cell phone, all you need is a device that broadcasts on the correct frequencies.

How jammer works:

Disrupting the communication between the phone and the cell-phone base station in the town. It's a called a denial-of-service attack. Although different cellular systems process signals differently, all cell-phone networks use radio signals that can be interrupted. GSM, used in digital cellular and PCS-based systems, operates in the 900-MHz and 1800-MHz bands in Asia.

Block Diagram:

Power Supply Oscillator

Noise Generato

rAmplifier Antenna

Antenna: Every jamming device has an antenna to send the signal. Antennas are external to provide longer range and may be tuned for individual frequencies.

Circuitry:Tuning circuit - Controls the frequency at which the jammer broadcasts its signal by sending a particular voltage to the oscillator

Noise generator - Produces random electronic output in a specified frequency range to jam the signal

RF amplification (gain stage) - Boosts the power of the radio frequency output to high enough levels to jam a signal

Power supply:Smaller jamming devices are battery operated. Some look like cell phone and use cell-phone batteries. Stronger devices can be plugged into a standard outlet or wired into a vehicle's electrical system.

circuit design:

BD Mobile Frequency Info:

Robi: Robi uses GSM 900 MHz standard and operates on allocated 12.8 MHz frequency spectrum.

GrameenPhone: GrameenPhone uses GSM 900/1800/2100 MHz standard and operates on allocated 2×7.4/2×7.2 + 2×7.4 MHz frequency spectrum.

Banglalink: Banglalink uses GSM 900 MHz standard and operates.

Airtal: Airtal uses GSM 900/2100 MHz standard and operates.

Application:

To maintain the complete silence in library and lecture hall To avoid fraud in examination hall For providing security in business conference, seminar, meeting Police and defense can use for their security purpose Personal safety reason

Legality:

Mobile phone jammer illegal to use in maximum country. In Bangladesh its Illegal to operate, supply or possess. It can be use only for the government purpose.

Conclusion:

Every technology has good aspect as well as bad aspect the important thing is, how we are using it. Cell phone jammer are very useful to the society from the anti-social elements. Cell phone jammer prevent students from carrying phone to the colleges.

Reference:

1. Blockyourid.org, [Online: 2013], [Cited: 20.10.2015], Available: http://mail.blockyourid.com/~gbpprorg/mil/celljam/simple/index.html

2. Btrc.gov.bd, [Online: 19.10.2010], [Cited: 20.03.2015], Available: http://www.btrc.gov.bd/cellular-mobile

3. Instructables.com, [Online: 2006], [Cited: 22.10.2015], Available: http://www.instructables.com/id/How-To-Create-Your-Signal-Jammer/

4. Mepits.com, [Online: 2005], [Cited: 22.10.2015], Available: https://www.mepits.com/tutorial/326/Latest-Technologies/Mobile-Phone-Jammer-How-it-works?-Application-Sectors

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