H - Electricity – 04 – M
Patent
H - Electricity
04
M
340/79
H04M 11/04 (2006.01) H04B 3/58 (2006.01)
Patent
CA 1070246
SIGNAL REPEATER FOR POWER DISTRIBUTION LINE COMMUNICATION SYSTEMS ABSTRACT OF THE DISCLOSURE A half-duplex communication repeater for use with power distribution lines. The repeater includes two re- ceivers, two signal generators, a single power amplifier, and a control circuit. The control circuit coordinates the operation of the receivers and the signal generators and prevents the application of the signals from both generators simultaneously to the signal amplifier. The outputs of the two signal generators are applied to transmission gates which are both coupled to the signal amplifier. When an appropriate signal is detected by one receiver, it produces an output signal which is coupled to a latching circuit, The latching circuit turns on the appropriate transmission gate to pass the signal from the corresponding signal gener- ator to the signal amplifier. Due to the operation of the latching circuit, a signal detected simultaneously by the other receiver will not cause the other transmission gate to turn on and apply two signals simultaneously to the signal amplifier. A third transmission gate may be coupled to the common output connections of the other two transmission gates for providing a load on the gate devices to reduce the signal transfer through the gate devices when they are in the tunred-off condition.
269629
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