Created By :

Shekhada Nikunj Godhani Nikhil

MOBILE JAMMER

A mobile phone jammer is a device used to prevent cellular phones from receiving signals from base stations.

Jamming devices overpower the cell phones by transmitting a signal on the same frequency and at high enough power that the two signals collide and cancel each other out.

Mobile phone jammer block cell phone use by sending out radio waves along the same frequencies that Mobile phones use.so mobile phone would simply appear out of range.

Mobile phone jammer :

Most Mobile phones use different bands to send and receive communications from towers. Jammers can work by either disrupting phone to tower frequencies or tower to phone frequencies.

Mobile jammer operates in the 900 MHz and 1800 MHz bands in Europe and Asia and in the 1900 MHz in the US.

The actual range of the jammer depends on its power and the local environment which include hills and buildings.

Smaller handheld Mobile jammer block all bands within a 30-foot range (9 meters).

The radius of cell phone jammers can range from a dozen feet for pocket models to kilometers for more dedicated units.

The TRJ-89 jammer can block cellular communications for a 5-mile (8 km) radius.

Less energy is required to disrupt signal from tower to mobile phone, than the signal from mobile phone to the tower (also called base station), because the base station is located at larger distance from the jammer than the mobile phone and that is why the signal from the tower is not as strong.

Older jammers sometimes were limited to working on phones using only analog or older digital mobile phone standards.

Newer models such as the double and triple band jammers can block all widely used systems (CDMA, GSM, etc) and are even very effective against newer phones.

A cell phone works by communicating with its service network through a cell tower or base station.

Cell towers divide a city into small areas, or cells. As a cell-phone user drives down the street, the signal is handed from tower to tower.

Inside the Jammer:

The main electronic components of a jammer are:• Voltage-controlled oscillator –

Generates the radio signal that will interfere with the cell phone signal.

• 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 cell-phone network signal (part of the tuning circuit)

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

• Power supplySmaller 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.• Antena Every jamming device has an antenna to send the signal. Some are contained within an electrical cabinet. On stronger devices, antennas are external to provide longer range and may be tuned for individual frequencies. Some devices can store the frequencies that they have jammed to prevent later tuning necessary in repeated use of that frequency.

Outlook of jammer :

THE RISKS AND LEGALITY OF JAMMING

Since these mobile jammers may or may not be legal to possess or operate based on the specific laws of the area.

Australia: illegal to operate, supply or possess. Brazil: illegal, but installation in jails have been proposed. Canada: illegal, except by federal law-enforcement

agencies who have obtained approval. France: France legalized cell-phone jammers in theaters

and other places. Still legally used inside jails. Japan: illegal to use, but legal to own. Use of fixed high

output jammers with long range is illegal, with fines of up to max $250,000USD and/or 5 years in prison.

India: legal, Government, Religious Places, Prisons and Educational Institutions use jammers.

Mobile jammers can be used in practically any location, but are used in places where a phone call would be particularly disruptive like Temples, Libraries, Hospitals, Cinema halls, schools & colleges etc.

Remember jammers are mainly used for military or Government use.

Application of Mobile jammer :

Mobile Jammers were originally developed for law enforcement and the military to interrupt communications by criminals and terrorists to foil the use of certain remotely detonated explosives.

The US military routinely uses jammers to protect secure military areas from electronic surveillance. Jammers can also be used to protect traveling convoys from cell phone triggered roadside bombs in places.

jammer can also be used by criminals who break into homes and want to prevent any calls for help.

However, jammers can also be used for good. Spanish terrorists used cell phone triggered bombs in the

2004 Madrid train bombings. Just think, someone using a cell phone jammer who was only trying to protect themselves from a mobile blabbermouth could have prevented the bombing and saved hundreds of lives.

In most jails, libraries and university classrooms jammers are already in use

Mobile jammer also used in the company meeting, churches, movie theaters to prevent any disturbance by the mobile.

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