Device for disconnecting the receiver in case of a small signal-

Details Device for disconnecting the receiver in case of a small signal- Device for disconnecting the receiver in case of a small signal-

1981-03-02

1982-10-19

Bookbinder, Marc E.

Pulse or digital communications

Repeaters

Testing

324 57N, 375104, 455 56, 455222, 455225, 455303, H04L 2714, H04B 360, H04B 110, H04B 1700

Patent

active

043554075

ABSTRACT:
Rapid disconnection of a receiver in response to a small signal-to-noise ratio is provided in that in the receiver there is arranged a FSK demodulator having two channels connected in parallel at the input ends and each having a band-pass filter, an amplifier and a detector whose output is connected to a voltage comparator. The output signal of the voltage comparator is fed to an input of an AND gate in the receiving arm by way of a series arrangement of a high-pass circuit, a demodulator and a low pass filter to the inverting input of a further comparator whose non-inverting input is connected to a comparison voltage by way of a variable voltage divider. The output of the further comparator is connected to the other input of the AND gate.

REFERENCES:
patent: 3155909 (1964-11-01), Shepherd
patent: 3383600 (1968-05-01), Calfee
patent: 3766479 (1973-10-01), Thalimer et al.
patent: 3947769 (1976-03-01), Rousos et al.
patent: 4125809 (1978-11-01), Mott
patent: 4209749 (1980-06-01), Becker et al.

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