Radio locating unit for persons in distress
First Claim
1. A radio locating unit for persons in distress comprising a radio signal transmitter provided with an aerial for the transmission of a radio signal with a predetermined frequency and a receiver provided with an omni-directional aerial for the receiving of signals with said predetermined frequency, characterized in that the receiver is further provided with a directional receiving aerial and a first change-over contact movable manually from a rest position at which the receiver input is connected to the omni-directional receiving aerial, so that the unit performs as a transceiver suited to respond to any call signal picked up by the receiver with an answer signal automatically transmitted by the transmitter, to an emergency position at which the receiver input is connected to the directional receiving aerial so that the receiver acts as a radio direction finder adapted to pick up answer signals, whereby the transmitter acts as call transmitter and thereby permitting the tracking and location of signal sources.
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Accused Products
Abstract
Radio locating unit for persons in distress which unit is provided with a directional antenna whereby it can be used as active search unit by a rescuer and which is further provided with an omni-directional antenna and automatic switching means for energizing the transmitter part whereby it is used as passive unit by a person to be rescued e.g. a person buried by an avalanche.
29 Citations
3 Claims
- 1. A radio locating unit for persons in distress comprising a radio signal transmitter provided with an aerial for the transmission of a radio signal with a predetermined frequency and a receiver provided with an omni-directional aerial for the receiving of signals with said predetermined frequency, characterized in that the receiver is further provided with a directional receiving aerial and a first change-over contact movable manually from a rest position at which the receiver input is connected to the omni-directional receiving aerial, so that the unit performs as a transceiver suited to respond to any call signal picked up by the receiver with an answer signal automatically transmitted by the transmitter, to an emergency position at which the receiver input is connected to the directional receiving aerial so that the receiver acts as a radio direction finder adapted to pick up answer signals, whereby the transmitter acts as call transmitter and thereby permitting the tracking and location of signal sources.
Specification