Communications: electrical – Systems – Selsyn type
Patent
1975-01-31
1976-06-29
Caldwell, John W.
Communications: electrical
Systems
Selsyn type
325 5, 340151, H04M 1104
Patent
active
039672646
ABSTRACT:
A distribution network power line communication system which is divided into addressable communication zones defined by repeaters located at the distribution transformers of the distribution network. Each repeater, when uniquely addressed by an interrogation signal from an interrogating source, strips its address from the interrogation signal and sends the resulting modified interrogation signal to its associated remote communication terminals, by-passing the associated distribution transformer. A timely, error-free response signal from a remote communication terminal is modified by a repeater to include the repeater address, and the modified response signal is sent back to the interrogating source. The binary base band interrogation and response signal information is preferably pulse width modulated to provide a self clocking format, and this self clocking signal is passed through two stages of frequency modulation to provide a signal which makes the receivers thereof substantially immune from drift.
REFERENCES:
patent: 3264633 (1966-08-01), Hellar
patent: 3359551 (1967-12-01), Dennison
patent: 3656112 (1972-04-01), Paull
patent: 3693155 (1972-09-01), Crafton et al.
McGivern James P.
Ottobre Louis G.
Whyte Ian A.
Caldwell John W.
Groody James J.
Lackey D. R.
Westinghouse Electric Corporation
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