Transmitter-receiver

Details Transmitter-receiver Transmitter-receiver

1995-11-22

1997-11-18

Pham, Chi H.

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

455 78, H04B 140

Patent

active

056898193

ABSTRACT:
In a transmitter-receiver having a transmitting circuit and a receiving circuit, the present invention mitigates an interference between the transmitting circuit and the receiving circuit. A quartz-crystal oscillator is provided as a common reference signal source for the local oscillators and the relation among frequencies is determined so that the frequencies such as local oscillating frequencies and intermediate frequencies within the transmitter-receiver do not overlap each other. Interferences between the transmitting circuit and the receiving circuit are mitigated to prevent a characteristic deterioration, spurious radiation, etc. Thereby the transmitter-receiver may be reduced in size and weight. Further, by sharing a quartz-crystal oscillator having a high frequency stability, narrowing of bands in radio channel spacing may be readily achieved.

REFERENCES:
patent: 2903693 (1959-01-01), Ley
patent: 4373205 (1983-02-01), Mizota
patent: 5123008 (1992-06-01), Beesley
patent: 5276915 (1994-01-01), Marko et al.
patent: 5307378 (1994-04-01), Norimatsu
patent: 5471652 (1995-11-01), Hulkko
patent: 5483679 (1996-01-01), Sasaki

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