| 摘要 |
A security system suitable for a vehicle 10 comprises a remote transponder 16 and a transmitter/receiver 14 which is mounted on the vehicle 10 and which is associated with a controller 12 for controlling the security functions of the vehicle 10 in response to a signal from the transmitter/receiver 14. The transponder 16 includes a transmitting means 18 which is arranged to transmit a security signal in one or more of a predetermined range of channels. The transmitter/receiver 14 is arranged to scan the range of channels and to determine in which one or more of those channels the security signal has been transmitted.
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