12-06-2012, 01:01 PM
SEMINAR ON INTRODUCTION OF CELL PHONE JAMMERS
CELL PHONE JAMMERS.ppt (Size: 918 KB / Downloads: 117)
INTRODUCTION
Cell phones are used everywhere in these days
Blocking mobile frequency from 5 to 200 meters radius
Jammer is a device to help you keep away from noise or disturbance of cellular phone calls
Phone Jammer is suitable in executive offices, board meetings, conferences, seminars, libraries, cinemas, religious places, public transport, concert halls, restaurants and educational institutions etc.
JAMMER BASICS
Disturbing a cell phone is the same jamming
Cell towers divided a city into small areas
A jamming device transmits on the same radio frequencies as the cell phone .
It's a called a denial-of-service attack. The jammer denies service of the radio spectrum to the cell-phone users within range of the jamming device.
HOW IT WORKS
Jamming devices overpower the cell phone by transmitting a signal on the same frequency
Cell phones are full-duplex devices
Less complex devices block only one group of frequencies
The actual range of the jammer depends on its power
Some cell-phone jammers are made to look like actual phones.
CONCLUSION
The increased technology of the cellular phone has made life convenient and easy. However in some situations this convenience becomes a nuisance to other people. Areas such as concert halls, conference rooms and theaters are where this nuisance is felt the most.
Cell-phone users don't know they're being jammed. The phones just indicate that there's no service or no signal from the network. The jammer simply interrupts the phone's ability to establish a page link with the nearest cell-phone tower.
