JPS57147336A - Stabilizing device for high frequency electric power - Google Patents

Abstract

PURPOSE:To prevent the generation of high frequency output electric power which is transiently excessive, by providing a high frequency electric power stabilizing device with an output presence detector and a resettable integrator. CONSTITUTION:A high frequency electric power stabilizing device which has a negative feedback loop and is capable of stationary output electric power stabilizing operation is provided with an output device 12 which detects the temporary break state of a high frequency output (a), and an integrator 13 which is reset by its output signal (h). When the integrator 13 is reset, the negative feedback loop is disconnected and the operation point of a variable attenuator 2 is determined by the output (F) of an operation point setter 10. This output (f) is adjusted previously to set the output (a) of a power amplifier 3 below a prescribed value when the break state is reset, and the gain of an error amplifier 9, the time constant of the integrator 13, etc., are set adequately to smoothly increase the output electric power (a) without exceeding a prescribed output level during the release of the resetting. Consequently, a transmission tube is protected against an excessive input and an evil influence of an excessive transmission output upon a communication circuit is prevented.