Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent
1996-09-20
1999-05-25
Strecker, Gerard
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
324335, 333172, 343722, 455286, 455290, G01V 308, H03H 700, H04B 118, H01Q 100
Patent
active
059072423
ABSTRACT:
A balanced bandpass preamplifier assembly (23) is disclosed for use in a locator (10) for locating a beacon transmitter (18) housed within an underground boring device (12). The bandpass preamplifier assembly (23) includes a balanced bandpass filter (28) of the Butterworth type with second order filter characteristics. The preamplifier assembly (23) provides reception of beacon frequencies at two distinct frequencies, preferably 29.430 KHz and 32.768 KHz. The antenna (14) of the . locator (10) forms the series inductance in the bandpass filter (28).
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Strecker Gerard
The Charles Machine Works, Inc.
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