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    1.
    发明专利
    未知

    公开(公告)号：DK18385A

    公开(公告)日：1985-03-15

    申请号：DK18385

    申请日：1985-01-15

    Applicant: MOTOROLA INC

    Inventor： VICTOR ALAN MICHAEL ,  DAVIS DARRELL EUGENE

    IPC: H03D7/16 ,  H03J5/02 ,  H04B20060101 ,  H04B1/26 ,  H04B

    Abstract: Superheterodyne radio receiver 200 with the ability to select several channels, with a first frequency synthesizer 230 which is able to develop any of a predetermined number of first oscillator frequencies for mixing with an incoming signal, to form a first intermediate frequency. A second frequency synthesizer 235 develops selectively one of two oscillator frequencies which corresponds to either high or low side injection for mixing with the first intermediate frequency, to form a second intermediate frequency. A frequency selector circuit 260, 255, 250 is connected to two synthesizers 230, 235 to select a suitable one of the first oscillator frequencies in order to set the receiver to the required channel and to select a suitable one of the second oscillator frequencies in order to eliminate self-disconnecting error signals in the receiver.

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