RADIO TRANSMISSION EQUIPMENT

PROBLEM TO BE SOLVED: To prevent destruction of an attenuator by setting a control voltage, which is to be inputted to automatic gain control(AGC), at a fixed voltage at a moment, when an SHF signal is inputted, and switching a control signal from an AGC circuit so as to input it to the AGC when a feedback voltage from a detector is stabilized. SOLUTION: When the SHF signal is outputted by a signal generator(SG) 1, a switcher 7 is connected with VSTD by a comparator 8. The VSTD is set on conditions that the voltage does not exceed the rated voltage of an attenuator 9 and is lower than a reference voltage VCOMP of the comparator 8. Besides, the VCOMP is a voltage, which does not exceed rating of the attenuator 9, as well. When the voltage of an AGC circuit 6 is lower than the reference voltage VCOMP of the comparator 8, the switcher 7 is switched to the side of the AGC circuit 6 and an AGC amplifier 2 is operated.