Importance

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Abstract

A method and apparatus for extending the range of portable RF transceivers and for providing a select-call system includes a hybrid remote control system to extend the range of a portable transceiver and to permit the operator of a vessel or vehicle to communicate hands-free through the utilization of his own full power base station and antenna, in which a modified full duplex system is used to control transmit and receive cycles from the portable unit so that the system can operate regardless of interference on the channel to which the base station is timed. Also provided is a selective calling system in which a recipient's transceiver is turned on by the transmitting transceiver through punching in the recipient's call letters or at least its address. As an added feature, the transmitting station automatically transmits its own call letters which are displayed at recipient's receiver. This system thereby quiets all receivers until the particular transceiver is digitally addressed. An emergency code such as (0,0,0,0) activates all receivers for emergency transmissions on an emergency channel, such as on VHF channel 16, so that the emergency channel can be monitored without distraction from non-emergency traffic. This modular approach provides a universal system in which standard transceivers can be accommodated.

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First Claim