Metrotech Corporation

George Mainescu

Razvan Gabriel Stefanoiu

Ion Dracea

John Mark Royle

Stephen John Petherick

Paul Lucian Lacatus

Mark Drew

A transmitter and receiver for performing a signal select algorithm are provided. A transmitter for providing a signal on a line to be located includes at least one direct digital synthesizer, the direct digital synthesizer producing two component frequencies in response to an input square wave signal; and a feedback loop providing the input square wave.

Signal select in underground line location

A signal generator that provides signals for multiple outputs is presented. In some embodiments, a signal generator can include switching circuitry that is coupled to provide a signal to an active output of a plurality of outputs in response to control signals; a driver that provides the signal to the switching circuitry, the signal being at a frequency appropriate for the active output; and a logic that provides the control signals to the switching circuitry and provides a waveform to the driver, the waveform having the frequency appropriate for the active output, the control signals indicating which of the plurality of outputs is the active output.

Signal generator with multiple outputs

In accordance with some embodiments, a system includes a line locator and a device configured to communicate through an internet with a server also coupled to the internet. Furthermore, a plurality of line locate transmitters are distributed geographically and configured to communicate through the internet with the server. The server operates to activate one of the plurality of line locate transmitters based on a geographic location of the device.

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Hillsdale, NJ, United States of America

George Mainescu