Abstract: An RF modem used with a host device for transmitting information to, and receiving information from, other host devices. Prior to a transmission, the information is Manchester encoded and transmitted by On/Off Keying. A superregenerative receiver circuit (which may also operate as the transmitter) operating at the transmitted frequency detects the transmitted information. The information is recovered in conjunction with a timing function which times the buildup of RF energy within the receiver circuit so that a transmitted binary 1 can be distinguished from a binary 0. For use in a system with a plurality of hosts, multiple channels of operation are provided. In order to conserve power, the apparatus is operated in a power saving, sleep or scanning mode, as well as a full power active mode.

Abstract: A superregenerative circuit which is operable in a transmit mode and a receive mode of operation. A superregenerative oscillator and a single antenna are functional in both modes. To minimize any undesired RF energy which may be radiated during the receive mode of operation, the circuitry includes decoupling means connected between the antenna and the oscillator. During reception, the oscillator is periodically quenched, and received signals are recovered by circuitry which obtains, during unquenched periods, time samples indicative of the time required for the RF energy to build up to a predetermined level in the oscillator circuit.