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Device for disconnecting the receiver in case of a small signal- to-noise ratio for a digital-modulated radio system
Device for disconnecting the receiver in case of a small signal- to-noise ratio for a digital-modulated radio system
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机译:用于数字调制无线电系统的信噪比小的情况下用于断开接收器的设备
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摘要
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.
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