Device for disconnecting the receiver in case of a small...

Details Device for disconnecting the receiver in case of a small... Device for disconnecting the receiver in case of a small...

H - Electricity

04

B

325/72, 325/80

H04B 1/16 (2006.01) H03G 3/34 (2006.01) H04B 1/10 (2006.01) H04L 27/148 (2006.01)

Patent

CA 1173110

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 compara- tor 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.

371975

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