RECEIVER CAPABLE OF RELIABLY DETECTING A FAILURE

摘要

In a receiver comprising a receiver filter (12) with a frequency attenuation band and a pilot oscillator (25) for generating a pilot oscillation signal with a pilot frequency in the frequency attenuation band, a coupler (26) couples the pilot oscillation signal and a filtered receiver signal of the receiver filter into a coupled signal. A low noise amplifier (13) amplifies the coupled signal into an amplified signal which comprises an amplified receiver signal derived from the filtered receiver signal and an amplified pilot oscillation signal derived from the pilot oscillation siganl. A branching filter (27) branches the amplified signal into the amplified receiver signal and the amplified pilot oscillation signal. A pilot signal detector unit (28) detects the amplified pilot oscillation signal to produce a direct pilot signal. A failure monitoring unit (29) monitors the direct pilot signal to produce a fault signal when the direct pilot signal is found faulty.