| 摘要 |
The system for preventing the unauthorised operation of a vehicle or entry into a dwelling house or the like includes a transmitting unit and a receiving unit. The receiving unit is mounted and concealed inside the vehicle or dwelling house and the transmitting unit is a hand-held portable, self powered, device, which generates a magnetic field over a limited range that varies according to a uniquely coded sequence. - When the transmitting unit is in close proximity to the receiving unit, the presence of the varying magnetic field will be sensed by the receiving unit. If correctly coded it will allow power to flow from a power source to an enabling element of the device to be secured, e.g. the vehicle's ignition system or a solenoid valve located in the vehicle's fuel line. |
