Portable telephone line test set

Details Portable telephone line test set Portable telephone line test set

1980-04-10

1982-04-06

Robinson, Thomas A.

H04M 500, H04B 346

Patent

active

043237380

ABSTRACT:
A portable two wire line test set having a self-contained source of electrical energy for powering a hybrid circuit and first and second amplifier means. The first amplifier receives and amplifies voice signals transmitted over the two wire line and the second amplifier amplifies and transmits voice signals over the two wire line. Transducer means are connected to both amplifiers to convert signals to audible sounds and vice versa. In an alternative embodiment a third tuned amplifier means is included for detecting and amplifying a signal in a predetermined frequency range so that the identity and condition of particular two wire lines may be determined.

REFERENCES:
patent: 3790723 (1974-02-01), Stewart
patent: 3792205 (1974-02-01), O'Dea
patent: 3822366 (1974-07-01), O'Dea et al.
patent: 3870836 (1975-03-01), Kusama
patent: 3881153 (1975-04-01), Harzer

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