| 摘要 |
Circuitry for interconnecting a radio transceiver to a telephone line is disclosed. The circuitry provides controlled access to the telephone system lines from remote radio transceivers by way of a base transmitter-receiver unit which is connected through an impedance matching network to the telephone line. A carrier operated relay responsive to the base receiver unit controls access to the telephone line by means of a time delay relay whereby signals received by the base station are connected to the telephone line. Audio signals originating in the telephone line are detected by a voice operated relay which activates the base unit transmitter to transmit such audio signals for two way communication with the remote radio unit on a single frequency channel.
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