In-band signal-to-noise ratio monitor for an FSK relaying system

Details In-band signal-to-noise ratio monitor for an FSK relaying system In-band signal-to-noise ratio monitor for an FSK relaying system

1976-09-20

1977-11-01

Miller, J D

Electricity: electrical systems and devices

Safety and protection of systems and devices

Series connected sections with faulty section disconnect

361 86, 361110, H02H 326

Patent

active

040568385

ABSTRACT:
An improved in-band signal-to-noise ratio monitor is used in conjunction with the receiver of an FSK relaying system. The improved monitor measures the signal-to-noise ratio both prior to and after the receiver input signal is filtered by a narrow bandpass filter. The magnitudes of the measured ratios are compared and, if all signal-to-noise ratio permissives are not satisfied, the tripping function of the relaying system at the receiver or local station is blocked or inhibited.

REFERENCES:
patent: 3387222 (1968-06-01), Hellwarth et al.
patent: 3443159 (1969-05-01), Altfather
patent: 3737781 (1973-06-01), Deerkoski
patent: 3768021 (1973-10-01), Ramaswamy et al.
patent: 3783387 (1974-01-01), Wernli

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