Radio telephone communications system

Details Radio telephone communications system Radio telephone communications system

1976-12-13

1978-12-12

Claffy, Kathleen H.

325 55, H04Q 704

Patent

active

041297490

ABSTRACT:
A radio telephone system comprising a base station and a plurality of portable units. The base station transmits information to portable units on a first frequency and the portable units transmit information to the base station on a second frequency. Each of the frequencies is divided into a number of communications channels by time division multiplexing. In one aspect the portable units include means for detecting the calling signal assigned to a particular portable unit which calling signal is sent by the base station and to cooperate with a switch to apply signals to a gate which then energizes an alarm at the particular portable unit to indicate to a person at the portable unit that the base station is calling. In another aspect the system includes a scanner and a channel seizing means which are both coupled to the receiver of the system and to each other. The means for detecting the calling signal is connected to the scanner and seizing means and is operative in response to the tone code assigned to that particular portable unit to cause the scanner and seizing means to establish a communications channel with the base station.

REFERENCES:
patent: 3840811 (1974-10-01), Blouch

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