| 摘要 |
PURPOSE:To considerably make easy to use a device by setting instantly a frequency at the one used most frequently on making a power source on by using a microcomputer. CONSTITUTION:A selection signal of 6.8mHz is outputted from a memory 58 to a microcomputer 38 with a signal to turn on a power source. A tuning signal is outputted from a PLL circuit 39 with the signal, and is added on a variable capacitor diode in a tuning circuit 41, then varies the oscillation frequency of an oscillation circuit 43, and a signal of 6.8mHz is extracted at an A channel reproduction circuit 31. Also, the signal is sent from the microcomputer 38 to a display device 55, and the frequency of 6.80mHz is displayed. Therefore, the frequency is automatically set at a center frequency used most frequently on making the power source on.
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