| 摘要 |
PURPOSE:To secure the quick and accurate adjustment between the reception frequency of the receiver and the display of the frequency. CONSTITUTION:Dial rope 9 is held between pressure contact roller 13 and reading roller 11, and motor 21 for dial rope driving is connected to tuning knob 3. Roller 11 is turned in accordance with the running of rope 9, and then potentiometer 12 is driven. Thus the voltage obtained by giving the voltage reduction to the voltage of reference power source 14 in accordance with the running of rope 9 emerges at the output end of meter 12. This voltage is read into CPU17. And the voltage to be generated from meter 12 when pointer 10 runs up to the prescribed position is memorized into memory circuit 18 as the reference value. The comparison is given between the output of CPU17 and reference value of circuit 18, and the stop signal is delivered to motor control circuit 20 from input-output circuit 16 when the coincidence is obtained through the above comparison. Thus the rotation of motor 21 is stopped. |
