Transmitter-receiver

Details Transmitter-receiver Transmitter-receiver

H - Electricity

04

B

H04B 1/40 (2006.01) H03D 7/16 (2006.01)

Patent

CA 2162937

In a transmitter-receiver having a transmitting circuit and a receiving circuit, it is an object of the present invention to mitigate 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.

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