To enable stable transmitted electric power control by reducing a control error while minimizing the circuit scale of an output detecting circuit part for transmitted electric power and an electric power control part.
Part of the transmitted electric power is taken out for electric power control, and passed through a detecting circuit 10 and an integration circuit 11 as the output detection circuit part to hold the output voltage of the integration circuit 11. The current voltage value is read in a microcomputer 14 through an A/D converter 12 and compared with a previously set reference value, and data corresponding to prescribed transmitted electric power are read out of a data table stored in a ROM 13 according to the comparison result to vary the control voltage of a variable gain amplification part 4 through a D/A converter 15.
SHIKAMATA YOSHIHIRO
UENO KAZUYA
