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LoJack frequnecy

The LoJack Stolen Vehicle Recovery System is an aftermarket vehicle tracking system that allows vehicles to be tracked by police, with the aim of recovering them in case of theft. The manufacturer claims a 90% recovery rate.[2] The name "LoJack" was coined to be the "antithesis of hijack", wherein "hijack" refers to the theft of a vehicle through force.[3]

LoJack’s core business comprises the tracking and recovery of cars, trucks, construction equipment, commercial vehicles and motorcycles. However, LoJack is expanding into new markets through licensing agreements and investments in areas such as cargo security and people at risk of wandering (probationers, parolees, and Alzheimer's patients). LoJack Corporation claims that over 250,000 vehicles have been recovered worldwide since the product was introduced more than two decades ago

How it works

The core of the LoJack Stolen Vehicle Recovery System is a small, silent radio transceiver that is clandestinely installed in a vehicle. The vehicle is not marked as possessing a LoJack transceiver, and the location of the transceiver in the vehicle varies from one car to the next. Once installed, the unit and the vehicle's VIN are registered in a database which interfaces with the National Crime Information Center (NCIC) system used by federal, state and local law enforcement agencies throughout the US. In the event of a theft, a customer reports the incident to the police, who make a routine entry into the state police crime computer, including the stolen vehicle's VIN. This theft report is recognized by LoJack's computer database, which automatically triggers the activation of the LoJack transceiver in the stolen vehicle.

Once the LoJack transceiver is activated, it starts sending out signals to tracking units, which are located in some police cars. The tracking unit receiving the signal then displays an alphanumeric serial number, an approximate direction to the vehicle, and an indication of the strength of the LoJack sending unit's signal (which roughly corresponds to how close by the unit, and thus the stolen car, are). Based on the serial number, the police can obtain a physical description of the vehicle, including make (brand), model, color, VIN, and license plate number. Every police car within a 2-3 mile radius equipped with a tracking unit will be alerted that the vehicle is near. Police aircraft can also be equipped with tracking units; these units are able to sense signals from further away than the units installed in police cars.

The company’s systems are operable in 27 US states and in the District of Columbia, and more than 30 countries.

The LoJack system can be upgraded to alert the owner of a vehicle if the car is moved or started, via LoJack Early Warning.

LoJack transmits on a radio frequency of 173.075 MHz. Vehicles with the system installed send a 200 millisecond (ms) chirp every ten seconds on this frequency. When being tracked after reported stolen, the devices send out a 200 ms signal once a second.[4][5] The radio frequency transmitted by LoJack is near the VHF spectrum band formerly used in North America by analog television channel 7,[6] although there was minimal interference due to the low power of radiation, brief chirp duration, and long interval between chirps.[7]

Security Issues

Vehicle tracking systems are potentially vulnerable to jamming attacks since the device must transmit incident messages to a receiver or telecommunications network.[8] Inexpensive handheld jammers have ranges around 5m, larger jammers can disrupt communication devices within a 200m radius. XM, 3G, GPS, GSM, UHF, VHF and bluetooth devices can all be muted with an appropriate transmitter device.

cell phone jammer , gps gsm jammer   LoJack  jammer

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