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Mobile Phone Jamming:

Mobile Phone Jamming A Brief Overview by Robert Maine and Robert Cochrane

What is it?:

What is it? Cell phone jamming is the use of an electronic device to prevent the transferring of data through a wireless phone

Is Jamming useful?:

Is Jamming useful? Jammers can be used practically anywhere Jammers are used primarily where silence is necessary or data transfer might be destructive Jammers are simple to build and use

Why might cell phone use be destructive?:

Why might cell phone use be destructive? As wireless phones rapidly overtook society in the 21 st century, many problems arose with the quick, easy option to transfer data either by voice or files through them such as : Espionage, Exposure of images, Recording conversation or video remotely, Cheating (Academically), etc.

How do they work?:

How do they work? Jammers simply overflow the frequency used by wireless phones with radio waves Enough interference caused by these waves will prevent communication between a wireless phone and a base tower

Slide 6:

Some Jammers are small, hand-held sized devices while others can be very large Smaller Jammers interfere mostly with the wireless phones themselves while devices with larger radii may interfere with the towers directly

Some Quick Numbers…:

Some Quick Numbers… Wireless phone network ranges generally from 800-1900Mhz Small Jammers block all communication in this range for a 30 ft radius Commercial size Jammers can block all communication for 5 miles

Slide 8:

Originally much of the technology associated with jamming was developed for military purposes A huge part of security in the military is data security; Jamming communications signals locally can prevent the loss of data Some Law Enforcement agencies use Jammers to prevent criminals from communicating Law Enforcement and Military both use Jammers for preventing signals from certain kinds of remote explosive detonation devices

Development Over Time:

Development Over Time Jammers originally worked on analog signals Eventually Jamming was necessary on digital networks Newer Jammers will block AMPS, iDEN, and GSM networks

Can I have one?:

Can I have one? Of course not (legally)! Jammers are highly illegal to civilians in the US Worldwide they are used in Libraries, Banks, Prisons, Hospitals, Churches, Movie theaters, and other places where locals or govt. have deemed wireless phone use more of a problem than a plus

Sources:

Sources http://electronics.howstuffworks.com/cell-phone-jammer.htm http://wireless.fcc.gov/services/index.htm?job=operations_2&id=cellular http://en.wikipedia.org/wiki/Mobile_phone_jammer http://www.methodshop.com/gadgets/reviews/celljammers/index.shtml