초록 ▼

Apparatus for electrical line communication that includes a coupler at each of two or more locations along a pair of lines, the coupler having capacitive circuits serially connected with an air-core transformer. The capacitive circuit is designed to resonate with the air-core transformer at a presel

Apparatus for electrical line communication that includes a coupler at each of two or more locations along a pair of lines, the coupler having capacitive circuits serially connected with an air-core transformer. The capacitive circuit is designed to resonate with the air-core transformer at a preselected frequency. A transmitter, receiver and modem may also be provided at each location. The apparatus incorporates a novel phase linear coupler which eliminates noise and is matched resistively to the characteristic impedance of the line at a preselected frequency. This apparatus therefore linearizes communication on the line and allows high speed data and voice communication over long distances.

대표청구항 ▼

[ What is claimed is:] [1.] A communications apparatus for communicating electrical signals through an electrical line having a characteristic impedance comprising:modulator means for modulating the electrical signals to produce a modulated carrier signal having a first preselected frequency;transmi

[ What is claimed is:] [1.] A communications apparatus for communicating electrical signals through an electrical line having a characteristic impedance comprising:modulator means for modulating the electrical signals to produce a modulated carrier signal having a first preselected frequency;transmitter means having an output impedance, connected to said modulator means for transmitting the modulated carrier signal;first coupler means connected between the electrical line and the transmitter means for matching the output impedance of said transmitter means to the characteristic impedance of the electrical line;said first coupler means comprising linear phase means for communicating the modulated carrier signal to the electrical line without phase distortion and capacitor means for resonating with the linear phase means at the first preselected frequency;wherein said coupler means communicates the carrier signal having a first preselected frequency less than 90 KHz and a linear phase bandwidth of approximately 7 KHz.