http://www.jammer-store.com/ Store Name Address Phone en 1440 Mon, 06 Sep 2010 23:40:02 +0000 VaM Shop RSS 2.0 Feed Copyright (c) 2010 Iris International Corporation michael@jammer.su (Iris International Corporation) http://www.jammer-store.com/ http://www.jammer-store.com/favicon.ico http://www.jammer-store.com/article_info.php/articles_id/2/article/WHAT-IS-GPS The Global Positioning System (GPS) is a satellite-based navigation system made up of a network of 24 satellites placed into orbit by the U.S. Department of Defense. GPS was originally intended for military applications, but in the 1980s, the government made the system available for civilian use. GPS works in any weather conditions, anywhere in the world, 24 hours a day. There are no subscription fees or setup charges to use GPS. How GPS works Global Positioning System satellites transmit signals to equipment on the ground. GPS receivers passively receive satellite signals; they do not transmit. GPS receivers require an unobstructed view of the sky, so they are used only outdoors and they often do not perform well within forested areas or near tall buildings. GPS operations depend on a very accurate time reference, which is provided by atomic clocks at the U.S. Naval Observatory. Each GPS satellite has atomic clocks on board. Each GPS satellite transmits data that indicates its location and the current time. All GPS satellites synchronize operations so that these repeating signals are transmitted at the same instant. The signals, moving at the speed of light, arrive at a GPS receiver at slightly different times because some satellites are farther away than others. The distance to the GPS satellites can be determined by estimating the amount of time it takes for their signals to reach the receiver. When the receiver estimates the distance to at least four GPS satellites, it can calculate its position in three dimensions. There are at least 24 operational GPS satellites at all times. The satellites, operated by the U.S. Air Force, orbit with a period of 12 hours. Ground stations are used to precisely track each satellite's orbit. Determining Position A GPS receiver "knows" the location of the satellites, because that information is included in satellite transmissions. By estimating how far away a satellite is, the receiver also "knows" it is located somewhere on the surface of an imaginary sphere centered at the satellite. It then determines the sizes of several spheres, one for each satellite. The receiver is located where these spheres intersect. How accurate is GPS GPS answers five questions simultaneously: "Where am I?" "Where am I going?" "Where are you?" "What's the best way to get there?" " When will I get there?" GPS is the only system today that can show your exact position on the Earth anytime, in any weather, no matter where you are! The accuracy of a position determined with GPS depends on the type of receiver. Most hand-held GPS units have about 10-20 meter accuracy. Other types of receivers use a method called Differential GPS (DGPS) to obtain much higher accuracy. DGPS requires an additional receiver fixed at a known location nearby. Observations made by the stationary receiver are used to correct positions recorded by the roving units, producing an accuracy greater than 1 meter. When the system was created, timing errors were inserted into GPS transmissions to limit the accuracy of non-military GPS receivers to about 100 meters. This part of GPS operations, called Selective Availability, was eliminated in May 2000. GPS Development GPS was designed by the U. S. military. The concept started in the late '60s but the first satellite wasn't launched until February 1978. In 1989 the Magellan Corp. introduced the first hand-held GPS receiver. In 1992 GPS was used in Operation Desert Storm. On March 1996 the President decided to make GPS free for civilian users. GPS System Description GPS has three segments: 1. The space segment now consists of 28 satellites, each in its own orbit about 11,000 nautical miles above the Earth. 2. The user segment consists of receivers, which you can hold in your hand or mount in your car. 3. The control segment consists of ground stations (five of them, located around the world) that make sure the satellites are working properly. GPS for Civilian Use At first, the military did not want to let civilians use GPS, fearing that smugglers, terrorists, or hostile forces would use it. Finally, bowing to pressure from the companies that built the equipment, The Defense Department made GPS available for non-military purposes, with some restrictions. On May 1, 2000, President Clinton lifted the restrictions, and announced that the option to degrade civil GPS signals during emergencies would be phased out by 2010. The federal government is committed to providing GPS technology for peaceful uses on a worldwide basis, free of charge. http://www.jammer-store.com/article_info.php/articles_id/2/article/WHAT-IS-GPS Thu, 01 Jan 1970 00:00:00 +0000 http://www.jammer-store.com/article_info.php/articles_id/3/article/WHAT-IS-GPS-JAMMER GPS (spy) tracking devices have become very popular nowadays, as they allow users to keep an eye on an asset's (or person's) whereabouts without actually following them at all times. It would seem that they've caused enough "trouble". A GPS Jammer is designed to block GPS Navigation and Tracking systems to receive GPS location information from satellites. Could be used for person, vehicle, house, or elsewhere concerned about been traced. The GPS jammer jams signals in a broadcasting range of 1450 to 1600Mhz (GPS L1 system) with defined jamming power. Powered by build-in battery, car power adaptor or AC power adaptor. However, if the tracker works on GSM/GPRS network also, you need to block GSM900/1800 or GSM850/1900 in the same time. Or else, the tracker could find your route through GSM/GPRS networks. Our models could block GPS/GSM/GPRS trackers very well. http://www.jammer-store.com/article_info.php/articles_id/3/article/WHAT-IS-GPS-JAMMER Thu, 01 Jan 1970 00:00:00 +0000 http://www.jammer-store.com/article_info.php/articles_id/4/article/WHAT-IS-A-CAR-USE-GPS-JAMMER A car use GPS jammer GP-5000 is a tiny device that blocks GPS tracking and data logging units. It's designed to knock out GPS logging/tracking/navigation systems which operating on your vehicle. Most spy devices can be quickly installed on a vehicle and allow the users to track your every move using Google earth etc or a GPS recording system. This GP-5000(GPS jammer/blocker/interceptor) will disable the GPS link and render the spy device useless. Both installation and operation of GP-5000 GPS jammer/blocker/interceptor are very easy. Screw omni antenna on antenna socket and plug into the car cigar lighter socket, then it's on. The only one requirement is the cigar lighter socket mush be 12v output power. http://www.jammer-store.com/article_info.php/articles_id/4/article/WHAT-IS-A-CAR-USE-GPS-JAMMER Thu, 01 Jan 1970 00:00:00 +0000 http://www.jammer-store.com/article_info.php/articles_id/5/article/WHAT-IS-A-MOBILE-PHONE-JAMMER Introduction to a mobile phone jammer 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 with in defined regulated zone. Upon activating a phone jammer, all idle phones with indicate "no network". Imcoming calls are blocked as if the cellular hand phone were off. When the phone jammer turn off, all cell phones will automatically re-establish communications and rrovide full service. Applications of a mobile phone jammer A phone jammer provides the ultimate solution in any area where cellular communications frquenty cause nuisance either by loud incoming call rings or resulting loud telephone conversations. Example of places where cell phones can be disruptive include: - public transport (trains, busses, etc) - theatres (movie theares, concert halls, playhouses, opera houses, etc) - lecture rooms - libraries - museums - restaurants - school and universities (classrooms, lecture halls, auditoriums, etc)(will block sms cheat also) - place of worship (mosques, shrines, churches, temples, etc) - country clubs - sporting events - recording studios - tv stations, radio station, etc Cell phone are innocent looking communication devies that enable continuous transmission of voice & data. In secured places, where policy does not warrant the use of mobile phones, it is almost impossible to detect a person conducting cell phone conversation or to spot other such misuse. Examples of places where cell phone use may not be allowed include: - business (conferences, board of directors rooms, seminars, meeting rooms etc) - government building and government complexes - law enforcement facilities - police stations - drug enforcement facilities - prison facilities, jails etc - courts of law and court hourses - embassies - military installtions, military complexes and military trading centres In accordance with fire code regulations, mobile phone must be switched "off" in any area that has a potentially explosive atmoshere, including "petrol service stations" where sparks could cause an explosion or fire. These preventable accidents occur more frequently than most people are aware. Areas where mobile phone use is prohibited include: - petrol & gas stations - oil refineries and storage facilities - offshore oil platforms - petro & gas transportation vehicles - chemical refineries and storage facilities - chemical transportation vehicles - laboratories - fireworks factories - liquefied petroleum - lpg transportation vehicles - natural gas refineries and storage facilities - matural gas transportation vehicles - power plants - industrial plants (or any where the air contains chemicals or particles such as grain, dust or metal powders) - hospitals http://www.jammer-store.com/article_info.php/articles_id/5/article/WHAT-IS-A-MOBILE-PHONE-JAMMER Thu, 01 Jan 1970 00:00:00 +0000 http://www.jammer-store.com/article_info.php/articles_id/6/article/Does-cell-phone-jammer-works-in-Europe-America- Jammer-Store's mobile/cell phone jammer blocker could jamming all of the mobile phone networks in Europe and American. However, for Europe and America they are two different models. Both of our portable and desktop model mobile phone interceptors could blocking universal GSM and CDMA wireless networks very well. Because worldwide GSM & CDMA frequencies all included in our jammer machine. The actual jamming range is depends on network conditions. Generally speaking, the desktop professional model of JMA could act very well even in strong signal conditions.v http://www.jammer-store.com/article_info.php/articles_id/6/article/Does-cell-phone-jammer-works-in-Europe-America- Thu, 01 Jan 1970 00:00:00 +0000 http://www.jammer-store.com/article_info.php/articles_id/7/article/Does-cell-phone-jammer-applicable-for-3G-UMTS-W-CDMA-network- Both of our portable and desktop mobile/cell phone jammers could block 3G mobile phone networks very well, the 3G networks also called UMTS and W-CDMA. The downlink of 3G networks are all working from 2110MHz to 2170MHz. We have included this frequency range into jammer/blocker machine. The jamming effect on 3G band is worse than a jammer act on GSM/CDMA band, because of the transmission features of UMTS/W-CDMA networks. However, Jammer-Store's advantaged RF engineerings could bring you comfortable enjoyment when using our jammers, and the univeral design ensures you can use our mobile phone jammers in every country in the world. http://www.jammer-store.com/article_info.php/articles_id/7/article/Does-cell-phone-jammer-applicable-for-3G-UMTS-W-CDMA-network- Thu, 01 Jan 1970 00:00:00 +0000