PHASE SELECTIVE TELEMETRY SYSTEM

摘要

This disclosure deals with a telemetry system adapted to be connected across a pair of transmission lines, the system generating pulses at one location along the line and detecting such pulses at another location. The system is designed for use with a transmission line carrying alternating current and includes one or more pulse transmitters or generators, each of which generates a pulse at a precise phase angle in each cycle of alternating current. The system also includes a pulse receiver or detector associated with each transmitter, each receiver responding only to pulses at the phase angle of the associated transmitter. The phase angle at which a transmitter generates and the associated receiver responds to a pulse is determined by a timing circuit which actuates a device in each AC cycle. In the transmitter, the device is part of a pulse generating circuit and in the receiver the device is part of a pulse responsive circuit.