Abstract: A receiver which has a linear approximation expression showing a relationship between the frequency deviations and corresponding changes to the voltage which is to be supplied to the voltage controlled reference oscillator to adjust the deviation following a reception frequency. The frequency deviation of the voltage controlled temperature compensated crystal oscillator is calculated based on the count values of the counters which count the frequency of the second local oscillator and the second intermediate frequency. The control voltage supplied to the voltage controlled temperature compensated oscillator is changed based on the linear approximation expression. Further, the approximation expression is represented as a series of powers of 2 based on a sensitivity coefficient of the voltage controlled reference oscillator. The approximation expression is changed by renewing the sensitivity coefficient of the voltage controlled reference oscillator.