22-07-2014, 10:12 AM
Cell Phone Jammer
[attachment=66092]
WHAT IS A “CELL PHONE JAMMER
Cell phone jammers are devices that create a temporary "dead zone" to all cell phone traffic in their immediate proximity.
A cell phone jammer is an instrument used to prevent cellular phones from receiving and transmitting the mobile signals to a base station. When used, the jammer effectively disables cellular phones in the area.
Other types of jammers include radar jammer
and radio jammer
Cont..
A phone jammer transmits low power radio signals to cut off communications between cell phones and cell base stations. It does not interfere with any communications other than cellular phones within the defined regulated zone.
Upon activating a phone jammer, all idle phones will indicate "NO NETWORK." Incoming calls are blocked as if the cellular hand phone were off.
When the phone jammer is turned off, all cell hand phones will automatically re-establish communications and provide full service.
WHY ARE JAMMERS USED?
A phone jammer provides the ultimate solution in any area where cellular communications frequently cause nuisance either by loud incoming call rings or resulting loud telephone conversations.
Cell phone jamming devices were originally developed for law enforcement and the military to interrupt communications by criminals and terrorists. Examples include
ecurityzonespublictransport,,classrooms, temples,tv & radio stations,jails,govt.buildings,military bases,industries etc.
JAMMING BASICS
Disrupting a cell phone is the same as jamming any other type of radio communication. 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.
A jamming device transmits on the same radio frequencies 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. The jammer denies service of the radio spectrum to the cell-phone users within range of the jamming device.
INSIDE A JAMMER
ANTENNA :
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.
RANGE OF A JAMMER
The actual range of the jammer depends on its power and the local environment, which may include hills or walls of a building that block the jamming signal.The power depends on proximity to towers, indoor and outdoor settings, even temperature and humidity play a role. Most cell phone jammers come in 2 versions, one for Europe, North Africa and the Gulf states GSM networks (900 & 1800) and one for the Americas & Canada (800 & 1900 mhz) networks
Most jammers only have a range of about 50 to 80 feet and will only effectively jam your immediate surroundings. Low-powered jammers block calls in a range of about 30 feet (9 m).
SIZE OF A JAMMER
Some cell-phone jammers are made to look like actual phones. Others are briefcase-sized or larger. The biggest jammers used by police and the military can be mounted in vehicles for convoy security.
LEGAL ISSUES
With the exception of Asian countries blocking cell-phone services by the general public is against the law in most countries like The United States, United Kingdom, Australia.
The FCC (Federal Communications Commission) in the United States fines for a first offense ranging very high for each violation or imprisonment and the device used may also be seized and forfeited to the government.
Governments are trying to make the best possible use of jammers and planning to relax their restrictions on using them in standard places like churches, movie theaters and courthouses.
CONCLUSION
Every technology has good aspect as well as bad aspect
the important thing is ,how we are using it.
Maybe someday governments will relax their restrictions on jammers and they will become standard in places like churches, movie theaters and courthouses. Until then, only government personnel. and outlaw jammers will be able to enjoy some peace and quiet at the movie theater or the ride via public transportation to work
[attachment=66092]
WHAT IS A “CELL PHONE JAMMER
Cell phone jammers are devices that create a temporary "dead zone" to all cell phone traffic in their immediate proximity.
A cell phone jammer is an instrument used to prevent cellular phones from receiving and transmitting the mobile signals to a base station. When used, the jammer effectively disables cellular phones in the area.
Other types of jammers include radar jammer
and radio jammer
Cont..
A phone jammer transmits low power radio signals to cut off communications between cell phones and cell base stations. It does not interfere with any communications other than cellular phones within the defined regulated zone.
Upon activating a phone jammer, all idle phones will indicate "NO NETWORK." Incoming calls are blocked as if the cellular hand phone were off.
When the phone jammer is turned off, all cell hand phones will automatically re-establish communications and provide full service.
WHY ARE JAMMERS USED?
A phone jammer provides the ultimate solution in any area where cellular communications frequently cause nuisance either by loud incoming call rings or resulting loud telephone conversations.
Cell phone jamming devices were originally developed for law enforcement and the military to interrupt communications by criminals and terrorists. Examples include
ecurityzonespublictransport,,classrooms, temples,tv & radio stations,jails,govt.buildings,military bases,industries etc. JAMMING BASICS
Disrupting a cell phone is the same as jamming any other type of radio communication. 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.
A jamming device transmits on the same radio frequencies 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. The jammer denies service of the radio spectrum to the cell-phone users within range of the jamming device.
INSIDE A JAMMER
ANTENNA :
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.
RANGE OF A JAMMER
The actual range of the jammer depends on its power and the local environment, which may include hills or walls of a building that block the jamming signal.The power depends on proximity to towers, indoor and outdoor settings, even temperature and humidity play a role. Most cell phone jammers come in 2 versions, one for Europe, North Africa and the Gulf states GSM networks (900 & 1800) and one for the Americas & Canada (800 & 1900 mhz) networks
Most jammers only have a range of about 50 to 80 feet and will only effectively jam your immediate surroundings. Low-powered jammers block calls in a range of about 30 feet (9 m).
SIZE OF A JAMMER
Some cell-phone jammers are made to look like actual phones. Others are briefcase-sized or larger. The biggest jammers used by police and the military can be mounted in vehicles for convoy security.
LEGAL ISSUES
With the exception of Asian countries blocking cell-phone services by the general public is against the law in most countries like The United States, United Kingdom, Australia.
The FCC (Federal Communications Commission) in the United States fines for a first offense ranging very high for each violation or imprisonment and the device used may also be seized and forfeited to the government.
Governments are trying to make the best possible use of jammers and planning to relax their restrictions on using them in standard places like churches, movie theaters and courthouses.
CONCLUSION
Every technology has good aspect as well as bad aspect
the important thing is ,how we are using it.
Maybe someday governments will relax their restrictions on jammers and they will become standard in places like churches, movie theaters and courthouses. Until then, only government personnel. and outlaw jammers will be able to enjoy some peace and quiet at the movie theater or the ride via public transportation to work