Communications: electrical – Systems – Selsyn type
Patent
1987-03-26
1988-11-01
Caldwell, Sr., John W.
Communications: electrical
Systems
Selsyn type
340310R, 340310CP, 455 3, 455108, 375 80, H04M 1104
Patent
active
047823224
ABSTRACT:
An electrical signalling apparatus including a transmitter and receiver connected to the same electrical power distribution network wherein a signal generated by the transmitter is used to control apparatus connected to the receiver. The system uses a pair of amplitude-modulated low frequency signals as the control signals that react with the receiver to control apparatus connected thereto. The transmitter has an oscillator modulated by twin tuning forks and provides a signal for a period of, for example 10 seconds, determined by a time-delay relay. The receiver has a demodulator followed by two filters connected to integrators. As soon as the integrated signals reach a predetermined value, a control signal is transmitted to the output. This apparatus provides a communication system which is virtually insensitive to interferences on the distribution network and operates perfectly with weak signals.
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Lechner Heinz
Taillens Jean-Francois
Caldwell Sr. John W.
Queen Tyrone
Transec Financiere S.A.
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