Communications: electrical – Systems – Selsyn type
Patent
1975-09-16
1977-02-15
Caldwell, John W.
Communications: electrical
Systems
Selsyn type
307 11, H04M 1104
Patent
active
040084671
ABSTRACT:
An arrangement of components for a distribution line communication system. Two or more independent secondary distribution lines are connected, through distribution transformers, to a primary distribution line. Carrier communication signals are transferred between the primary distribution line and one of the secondary distribution lines by a repeater located near one of the transformers. The carrier communication signals are propagated directly along this secondary distribution line and through associated service lines to communications terminals located near the electrical loads. Coupling apparatus is connected between the two independent secondary distribution lines to provide a path for the communication signals between the repeater and the communications terminals associated with the other secondary distribution line. The coupling apparatus provides a low-impedance path for the communication signals and a high-impedance path for signals at conventional electrical power frequencies.
REFERENCES:
patent: 2113708 (1938-04-01), Parrott
patent: 2294735 (1942-09-01), Du Mont
patent: 3693155 (1972-09-01), Crafton
patent: 3942168 (1976-03-01), Whyte
Pattantyus-Abraham Tamas I.
Whyte Ian A.
Caldwell John W.
Groody James J.
Smith R. W.
Westinghouse Electric Corporation
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