| 摘要 |
A heterodyne receiver such that the influence of the image disturbance signal of when the intermediate frequency is lowered is mitigated. Circuits 12I, 12Q, 13I, 13Q, 14 for switching the heterodyne method to an upper heterodyne method and a lower heterodyne method. The switching circuits 12I, 12Q, 13I, 13Q, 14 switch the heterodyne method to one of the upper and lower heterodyne method causing less image disturbance for each received frequency.
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