Test set for railway cab signal system

Details Test set for railway cab signal system Test set for railway cab signal system

1979-12-17

1982-02-02

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

455226, 324 59, 246169R, H04B 1700, G01R 2726, H04Q 120

Patent

active

043142346

ABSTRACT:
An electronic cab signal test set employing an integrated circuit code oscillator for producing a code signal and an integrated circuit carrier oscillator for producing a carrier signal which is modulated by the code signal to produce a code carrier signal. The coded carrier signal drives a current source which injects current signals directly into a pair of series aiding pickup coils for testing the integrity of the pickup coils and for checking the sensitivity of the amplifier. An indicating circuit including a voltage sensing device, a switching circuit, and an illuminating device connected to the code carrier for evaluating the condition of the d.c. supply source and for indicating that the test set is properly functioning.

REFERENCES:
patent: 3942108 (1976-03-01), Potter
patent: 4004230 (1977-01-01), Campbell
patent: 4047121 (1977-09-01), Campbell
patent: 4060767 (1977-11-01), Lohrmann
patent: 4160211 (1979-07-01), Wittrock

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