H - Electricity – 03 – K
Patent
H - Electricity
03
K
H03K 9/00 (2006.01) H04M 3/24 (2006.01)
Patent
CA 2099660
2099660 9212574 PCTABS00014 The apparatus has a probe (13) for collecting a small portion of a carrier signal on a pair of wires (37). The collected portion of the carrier signal is mixed with a local oscillator (17) signal so as to produce a heterodyned signal having a low frequency component and a high frequency component. The frequency of the local oscillator signal is selected to be within a few Kilohertz of the carrier signal so that the low frequency component is within an audible range. A low pass filter (19) removes the high frequency component. The low frequency component is amplified (21) and converted to sound. The audible signal is a representation of the carrier signal and allows a technician to determine the relative strength of the carrier signal and to identify the type of carrier signal on the wire pair.
Buzbee James M.
Connally Douglas R.
Industrial Technology Inc.
Smart & Biggar
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