Method and apparatus for detecting digital carrier signals on te

Details Method and apparatus for detecting digital carrier signals on te Method and apparatus for detecting digital carrier signals on te

1990-12-28

1992-08-18

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

4551641, H04L 2722

Patent

active

051406144

ABSTRACT:
The apparatus has a 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.

REFERENCES:
patent: 3311828 (1967-03-01), Chasek
patent: 3609247 (1971-09-01), Halstead
patent: 3882272 (1975-05-01), Norian
patent: 4006315 (1977-02-01), Halstead
patent: 4868887 (1989-09-01), Bertrand

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