Communications: electrical – Systems – Selsyn type
Patent
1989-10-04
1991-11-19
Crosland, Donnie L.
Communications: electrical
Systems
Selsyn type
340310A, 340310CP, 379167, H04M 1104
Patent
active
050669397
ABSTRACT:
A power line carrier (PLC) communication system operating on a conventional three wire (Hot (H), Neutral (N) and Ground (G) wires) power line uses more than one of the several RF transmission lines that are defined by the three wire power line to improve communication between units of the PLC system. According to a first embodiment a PLC system transmitter sends out of phase RF signals across the H and G wires and across the N and G power wires to the PLC system receiver, which receives and combines both of the out of phase transmissions, and so even if one of these paths is severely attenuated, the other path can deliver a sufficiently strong RF signal to the receiver for effective communications. According to another embodiment three different pairs of the H, N and G wires of the power line are selected in sequence for transmission of the PLC system RF and the pair that results in the best communication between a system transmitter and receiver is used for continuing communication. Also included is a PLC telephone extension system for which there is full duplex communication between each of the extension telephones of the system at different locations in the premises and the premises telephone line.
REFERENCES:
patent: 3810096 (1974-05-01), Kabat et al.
patent: 3911415 (1975-10-01), Whyte
patent: 4057793 (1977-11-01), Johnson et al.
patent: 4058678 (1977-11-01), Dunn et al.
patent: 4357598 (1982-11-01), Melvin, Jr.
patent: 4408186 (1983-10-01), Howell
patent: 4442319 (1984-04-01), Treidl
patent: 4473817 (1984-09-01), Perkins
Crosland Donnie L.
Dunn Robert T.
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