Communications: electrical – Systems – Selsyn type
Patent
1981-09-03
1983-11-01
Yusko, Donald J.
Communications: electrical
Systems
Selsyn type
34087039, 34087002, 34082554, 34082563, G08C 1902, H04B 360, H04Q 900
Patent
active
044132506
ABSTRACT:
A communication system for communicating digitally encoded information from a remote transmitting station to a central receiving station. The central station supplies d-c operating power to a remote station through a d-c power distribution line. A voltage regulator at the remote station receives the d-c operating power and derives therefrom a constant d-c voltage for powering the circuitry of the remote station. A digital transmitter at the remote station changes the magnitude of the current drawn through the voltage regulator, in accordance with a message to be transmitted, and thereby changes the current in the power distribution line without affecting the voltage supplied to the circuitry of the remote station. These line current changes are detected and decoded at the central station to reconstruct the transmitted message.
REFERENCES:
patent: 3659277 (1972-04-01), Brown
patent: 3742473 (1973-06-01), Hadden
patent: 3922490 (1975-11-01), Pettis
patent: 4272758 (1981-06-01), Giraud
patent: 4292633 (1981-09-01), Goodwin, Jr. et al.
patent: 4311986 (1982-01-01), Yee
LeBlanc Richard E.
Porter Ronald G.
Siemon Rolf W.
Beckman Instruments Inc.
Harder P. R.
Jason E. C.
Steinmeyer R. J.
Yusko Donald J.
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