| 摘要 |
An apparatus (10) electrical line communication includes a transmitter (16, 24), a receiver (18, 26), a modem (133), and a coupler (14, 22) at each of two or more locations along an electrical line (12). The couplers have capacitive circuits serially connected with an air-core transformer (36, 44, 50). The capacitive circuits resonate with the air-core transformer at a preselected frequency. A novel phase linear coupler eliminates noise and is matched resistively to the characteristic impedance of the line at the preselected frequency, which linearizes communication on the line and allows high speed data and voice communication over long distances.
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