| 摘要 |
PURPOSE:To change the receiving frequency continuously, by making the first and the second local oscillation frequencies variable and by circulating them in a prescribed range. CONSTITUTION:When up-switch Su is turned on, data of frequency division ratios N1 and N2 are supplied from CPU41 to frequency dividing circuits 24 and 34 through interfaces 53 and 54, and frequency division ratio N2 is reduced one by one. Frequency divisio ration N2 circulates between 399-300; and when N2 is changed from 300 to 399, frequency division ratio N1 is increased by one. When down-switch Sd is turned on, frequency division ratio N2 is increased one by one by data from CPU41, and frequency division ratio N1 is reduced by one at a prescribed time. |
