Mobile phone jammer | ClarewoodMercado.com

Mobile phone jammer

Article by jekky

History br The rapid proliferation of cell phones at the beginning of the 21st century to near ubiquitous status eventually raised problems such as their potential use to invade privacy contribute to academic cheating or even aid in industrial espionage In addition public backlash was growing against the intrusive disruption cell phones introduced in daily life While older analog cell phones often suffered from chronically poor reception and could even be disconnected by simple interference such as high frequency noise increasingly sophisticated digital phones have led to more elaborate counters Cell phone jamming devices are an alternative to more expensive measures against cell phones such as Faraday cages which are mostly suitable as built in protection for structures They were originally developed for law enforcement and the military to interrupt communications by criminals and terrorists Some were also designed to foil the use of certain remotely detonated explosives The civilian applications were apparent so over time many companies originally contracted to design jammers for government use switched over to sell these devices to private entities Since then there has been a slow but steady increase in their purchase and use especially in major metropolitan areas br Operation br As with other radio jamming cell phone jammers block cell phone use by sending out radio waves along the same frequencies that cellular phones use This causes enough interference with the communication between cell phones and towers to render the phones unusable On most retail phones the network would simply appear out of range Most cell phones use different bands to send and receive communications from towers called full duplexing Jammers can work by either disrupting phone to tower frequencies or tower to phone frequencies Smaller handheld models block all bands from 800MHz to 1900MHz within a 30 foot range 9 meters Small devices tend to use the former method while larger more expensive models may interfere directly with the tower 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 8 160 km radius br Actually it needs less energy to disrupt signal from tower to mobile phone than the signal from mobile phone to the tower also called base station because 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 so strong br 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 iDEN GSM et al and are even very effective against newer phones which hop to different frequencies and systems when interfered with As the dominant network technology and frequencies used for mobile phones vary worldwide some work only in specific regions such as Europe or North America br The jammer s effect can vary widely based on factors such as proximity to towers indoor and outdoor settings presence of buildings and landscape even temperature and humidity play a role br There are concerns that crudely designed jammers may disrupt the functioning of medical devices such as pacemakers However like cell phones most of the devices in common use operate at low enough power output lt 1W to avoid causing any problems br Legalities br Please help improve this article by adding reliable references Unsourced material may be challenged and removed March 2007 br Since these jammers actively broadcast radio signals they may or may not be legal to possess or operate based on the specific laws of the area one is in br Armenia 160 legal citation needed br Australia illegal to operate supply or possess br Belgium illegal to sell possess and operate licensed part of the spectrum br Canada illegal except by federal law enforcement agencies who have obtained approval br People s Republic of China Used by the Education government department as a method of thwarting cheating in schools During major end of year exams mobile phone jammers are used in areas surrounding high schools to prevent students inside from receiving calls or text messages which may be used for illicit purposes In some municipalities however rather than the use of jammers mobile signal towers close to schools are temporarily shut down for the duration of the week as exams are in progress br Czech Republic illegal br Finland illegal br France France legalized cell phone jammers in movie theaters and other places with performances in 2004 Abandoned due to complaints regarding emergency calls Still legally used inside jails br Germany illegal but installation in jails has been proposed br India Government Religious Places Prisons and Educational Institution use jammers br Ireland illegal to operate Legally used inside prisons by the Prison Service of Ireland br Italy technically not illegal to own but illegal to operate since the Italian law specifically prohibits to disturb radio and telephone communications GSM jammers are however legal to be used in places like hospitals churches movie theatres and other places with performances and other buildings where and when the use of mobile telephones may result in a leak of sensitive information on such occasions jammers are legal as long as their operation doesn t interfere with electronic medical equipment such as pace makers and allows mobile phones to make emergency calls Tri Band Jammers are reserved to and in use with the police forces and are being experimented in prisons br Japan llegal to use but legal to own Buying of mobile short range versions is allowed 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 br Mexico legal inside jails often used also in churches and hospitals br New Zealand legal inside jails br Norway illegal to own and operate The police and the military can use jammers in situations in which it is necessary br Pakistan legal inside banks often used also in libraries br Switzerland illegal br Turkey illegal Only the police and the military use jammers br Ukraine legal planed to use in schools br United Kingdom illegal to use but legal to own Installation in jails has been proposed br United States illegal to operate manufacture import or offer for sale including advertising Communications Act of 1934 with fines of up to 11 000 and imprisonment of up to one year br Notes and references br Howstuffworks How Cell phone Jammers Work br How mobile jammers work br ComLaw Management Series Notification that the Australian Communications and Media Authority prohibits the operation or supply or possession for the purpose of operation or supply of specified devices br Radiocommunication Act of Canada br Cellphone jamming technology will be placed in all NZ prisons NATIONAL NEWS tvnz co nz br br BBC News Jam mobile phone signals in prisons says inspector br Communications Act of 1934 as amended by Telecom Act of 1996 br FCC Wireless Services Cellular Services Operations Blocking amp Jamming br External links br Devices Enforce Cellular Silence Sweet but Illegal November 4 2007 NY Times br Silent but Deadly the Jammer Revenge on Mobile Prattlers November 18 2007 The Sunday Times br Categories Mobile telecommunicationsHidden categories Articles needing additional references from March 2007 All articles needing additional references All articles with unsourced statements Articles with unsourced statements from September 2008

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I am an expert from Cheap On Sales, usually analyzes all kind of industries situation, such as ricoh used copiers , minolta used copiers.

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