Method and device for locating a metal line
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United States of America Patent
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Jun 25, 2002
Grant Date -
N/A
app pub date -
May 30, 2000
filing date -
Jul 16, 1999
priority date (Note) -
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Abstract
A line locating device and method that is capable of determining the location of a line even when a significant amount of transmitted signal is coupled to neighboring lines. A device according to this invention includes a transmitter that couples a transmitted signal onto a metal line where the transmitted signal is a first signal having a carrier frequency modulated with second signal of a lower frequency. The device also includes a receiver that receives a received signal from the metal line and evaluates the signal in terms of period and polarity to determine an incoming signal or an outgoing signal. The receiver addresses an appropriate signaling unit in response to the incoming signal or the outgoing signal.
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