Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent
1990-06-18
1993-11-23
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
324 67, 455 40, G01V 311, G01V 3165, H04B 1302
Patent
active
052647951
ABSTRACT:
An improved locator system is provided which transmits digital and analog information over an electromagnetic field that is radiating from an underground source. The locator system includes a transmitter that modulates its output signal by turning its output signal on and off in response to a sequence of digital words. The transmitter also modulates an analog signal onto the transmitted signal. The modulated analog signal can include an audio frequency or voice signal. The improved locator system also includes a receiver that senses and detects the transmitted digital or analog signal impressed on the radiated electromagnetic field. The receiver also demodulates the transmitted audio frequency signal and provides an audio output signal to an operator.
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Edmonds Warren S.
Strecker Gerard R.
The Charles Machine Works, Inc.
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