Pulse or digital communications – Repeaters – Testing
Patent
1992-05-12
1994-03-22
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375 75, H04B 346
Patent
active
052971678
ABSTRACT:
The apparatus has a balanced capacitive probe for collecting a small portion of a carrier signal on a pair of wires. The collected portion of the carrier signal is mixed with a local oscillator 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 removes the high frequency component. The low frequency component is amplified 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. The probe enhances discrimination between uncoupled signals and coupled signals such as cross-talk.
REFERENCES:
patent: 3636446 (1972-01-01), Genter et al.
patent: 3721764 (1973-03-01), Dunn
patent: 3921087 (1975-11-01), Vosteen
patent: 4466107 (1984-08-01), Stoner
patent: 4851820 (1989-07-01), Fernandez
patent: 4853639 (1989-08-01), Vosteen et al.
Buzbee James M.
Connally Douglas R.
Chin Stephen
Industrial Technology Inc.
Mantooth Geoffrey A.
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