To realize a radio telephone equipment preventing abnormal transmission.

A modulated signal oscillation monitoring circuit 35 operating as a window compactor is provided between a waveform correcting means 20 and an orthogonal modulator 21 to adjust the attenuation level of ATT on a returning side to control the transmission output on the returning side to be fixed when the modulated signals of axis I and Q exceed a previously decided amplitude level. This control prevents abnormal transmission in which a transmission output more than regulated one is generated when the loop gain of a means correcting distortion caused by the change of environmental temp. and secular change, etc.