| 摘要 |
PURPOSE:To enable to display the reception frequency without adjustment, by counting the local oscillation frequency and the intermediate frequency in time sharing and performing addition or subtraction. CONSTITUTION:The oscillation frequency fL0 of the local oscillation circuit 5 of the radio receiver 1 is counted at the decimal counters 17- in cascade connection via the gate 10 controlled with the timing signal at the control circuit 34. Next, the intermediate frequency fIF from the IF amplifying circuit 6 is fed to the counter 17- via the gate 10 similarly with the next timing signal for count-down. Further, the content of the counters is respectively stored in the latch circuits 22- in the next timing, and succedingly displayed on the display unit 27. Further, in case of a super-heterodyne system, the counters 17- perform count-up. Thus, the reception frequency can be displayed without adjustment even to the receiver different in the intermediate frequency. |
