| 摘要 |
PROBLEM TO BE SOLVED: To provide a receiver which can shorten the time required for tracking adjustment, does not require temperature compensation, and can prevent increase of tracking errors caused by the fluctuation of the power supply voltage, and to provide a method with which the tracking of the receiver can be adjusted. SOLUTION: A DAC 4 generates voltage corresponding to the value of data D0 inputted from an MPU 81, by using a control voltage outputted from a low-pass filter 35 incorporated in a local oscillator 3 as a reference voltage for digital-to-analog conversion. A multiplication circuit 5 performs analog multiplication on the output voltage of the DAC 4 by using a prescribed multiplier. The output voltage of the circuit 5 is impressed upon a high-frequency tuning circuit 20 as a tuning voltage. The value of input data D0 of the DAC 4 corresponding to the tuning voltage, when the tracking error becomes a minimum at the medium value of a local oscillation frequency is measured and is stored in advance in an EEPROM 84; and the MPU 81 read the data D0 from the EEPRM 84 and inputs the data D0 to the DAC 4.
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