| 摘要 |
Marine personal locator system including personal transmitters activated by immersion and a receiver. The transmitter includes a microprocessor adapted to effect transmission of a unique tone identifying the transmitter. The receiver includes an omnidirectional and a yagi antenna switchable to a tuned RF amplifier, mixed with a frequency doubled crystal oscillator local oscillator signal, filtering, processing to retrieve any unique identifying tone, and signal strength detection and indication means. The transmitters are worn by sailors and the receiver is located on a vessel. The receiver is operable to monitor for any signals of a transmitter worn by a sailor fallen overboard using the omnidirectional antenna and sound a siren in the event of reception of such a signal. A sailor operating the receiver can switch to use the yagi antenna and using the signal strength indication means determine and monitor the direction of an overboard sailor relative to the vessel.
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