CONTROLLING METHOD OF TRANSMITTING OUTPUT

摘要

PURPOSE:To control an output efficiently independently of the kind of a transmitting output by roughly coupling a directional coupler to reduce its insertion loss, amplifying and detecting an advancing wave component by an amplifier to reduce its control error and inserting and controlling a high frequency variable attenuator between the directional coupler and the amplifier. CONSTITUTION:Since the input changing width regarded as a linear area is about <=20dB, the width is attenuated by 16-17dB in a high frequency attenuator 14 arranged on the output side of the directional coupler 4 to expand a line detecting area twice. Therefore, >=32-34dB is obtained in the linear area of the detected output. The detecting voltage is adjusted by a DC amplifier and a level adjuster so that the control range becomes a linear range and applied to a voltage comparator 11 to be compared with the voltage ES of a reference voltage generator 12 on the other terminal. A supplied power control part 10 compares the reference voltage ES with the output voltage EA of a DC amplifier 17 and automatically controls a control voltage EC to the low level in case of ESEA.