基本信息
摘要：1,013,141. Automatic amplitude control. MINISTER OF AVIATION. Dec. 28, 1961 [Dec. 30, 1960], No. 44872/60. Heading G3R. [Also in Divisions H3 and H4] A stabilized microwave oscillation generator comprises a basic microwave oscillator having means for controlling its frequency of oscillation in response to a first controlling signal, a microwave output amplifier having means for controlling its output amplitude in response to a second controlling signal, the basic microwave oscillator feeding its output to the microwave amplifier, and means for producing error signals indicating frequency error and amplitude error in the output oscillation of the stabilized oscillation generator and for applying them to the basic microwave oscillator and the microwave amplifier respectively to control the output frequency and amplitude. A two cavity klystron oscillator 1 of a c.w. radar transmitter is coupled through a ferrite isolator 2 to a two-stage klystron amplifier 3A 3B feeding an output waveguide 7; and antenna 8 a fraction of the output being tapped off by a directional coupler 18, passed through a ferrite modulator 4 and phase shifter 20, and injected into the guide through directional coupler 19. A bridge type frequency discriminator 9 of the kind described in Specification 836,165 is coupled to the waveguide by directional coupler 10 and produces signals at 11 representing amplitude variation error of the waveguide output, and signal at 12 representing frequency variation error to feed Doppler frequency amplifiers 14, 16 of e.g. 1-60 kc./s. bandwidth respectively energizing a modulator 6 in the EHT supply 5 to the oscillator klystron and the ferrite modulator to stabilize the oscillator amplifier against frequency and amplitude variations at Doppler frequencies, while a D.C. amplifier 17 energized from undirectional components of signal 12 controls the stabilized EHT supply to remove mean frequency variations. The amplitude control signals may alternatively be obtained from the IF envelope detector of a superheterodyne receiver fed from the waveguide output, and the Doppler and D.C. amplifier 14, 17 may be combined. The ferrite modulator may be replaced by a semi-conductor modulator, and the discriminator bridge may be of the improved type set forth in Specification 997,282.
摘要附图：
