A transmitting apparatus includes a polar signal producing circuit which
produces signals corresponding to the amplitude and the phase of a
transmitting modulated wave from an input signal and multiplies the
amplitude signal by the phase signal by a multiplying circuit to
amplitude modulate a phase-modulated wave to produce a transmitting
modulated wave and radiates this transmitting modulated wave as radio
wave from an antenna. An amplitude/phase detecting circuit detects an
amplitude signal and a phase signal from the input of the multiplying
circuit and the input of a phase-modulated signal producing circuit. A
delay difference computing circuit computes a correlation function
between the amplitude signal produced by the polar signal producing
circuit and the amplitude signal detected by the amplitude/phase
detecting circuit and a correlation function between the phase signal
produced by the polar signal producing means and the phase signal
detected by the amplitude/phase detecting means, and computes a delay
difference between the amplitude signal and the phase signal from maximum
values of the respective correlation functions. Then, a timing adjusting
circuit adjusts the delay time between the amplitude signal and the phase
signal on the base of the computed delay difference.