| 摘要 |
A variation in tuning frequency of an RF tuning circuit due to temperature changes in a radio receiver is prevented. A tuning frequency of an RF tuning circuit results from a coil (L) and a varicap diode that constitute the RF tuning circuit. A capacitance of the diode is corrected on the basis of a received frequency of a desired station and characteristics of the diode so that the tuning frequency matches the desired station. Thereafter, a temperature is detected by a temperature detection circuit. If a detected temperature T is within 0° C. to 50° C., the tuning frequency of the RF tuning circuit is maintained without change. If the detected temperature T is below 0° C. or higher than 50° C., the tuning frequency is fine adjusted to become lower or higher, respectively.
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