Communication apparatus

Details Communication apparatus Communication apparatus

1985-05-22

1986-12-30

Caldwell, Sr., John W.

Communications: electrical

Systems

Selsyn type

34087039, H04M 1104

Patent

active

046332170

ABSTRACT:
A communication apparatus for receiving both power and a sensor signal over the same transmission line having a first variable impedance element and a receiving impedance element connected in series across the transmission line, a second variable impedance element and a series impedance element connected in series across the transmission line, and a control circuit for controlling the first variable impedance element to maintain the transmission line voltage constant and for controlling the second variable impedance element to maintain the current flowing through the series impedance element constant, the control circuit simultaneously controlling the first and second variable impedance elements to maintain the current flowing through the series impedance element constant while transmitting data over the transmission line.

REFERENCES:
patent: 4190822 (1980-02-01), Swarbrick
patent: 4400588 (1983-08-01), Stobbs et al.

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