Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part
Patent
1992-10-22
1994-05-17
Ng, Jin F.
Telecommunications
Transmitter and receiver at separate stations
Having measuring, testing, or monitoring of system or part
455 70, 4552261, 455303, 330 2, 330 52, H04B 1700, H04B 110, H03F 366, G01R 1900
Patent
active
053136578
ABSTRACT:
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 to form a coupled signal. A low noise amplifier (13) amplifies the coupled signal into an amplified signal which comprises an amplified receiver signal component derived from the filtered receiver signal and an amplified pilot oscillation signal component derived from the pilot oscillation signal. A branching filter (27) branches the amplified signal into the amplified receiver signal component and the amplified pilot oscillation signal. A pilot signal component detector unit (28) detects the amplified pilot oscillation signal component 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.
REFERENCES:
patent: 3668533 (1972-06-01), Fish et al.
Maeta Makoto
Narahashi Shoichi
Nojima Toshio
Ohara Satoru
Sakamoto Hironori
Japan Radio Co. Ltd.
Ng Jin F.
Nippon Telegraph & Telephone Corporation
NTT Mobile Communication Network Inc.
Wisler Mark D.
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