The paper describes the design of an C-band microwave unit which consist two-stage preamplifier and a control and diagnostic monitoring system. The main building blocks of this amplifier are: solid state amplifier and helix delay line TWT with proper HV power supply. The necessary input power is ∼5 mW, output power min. 9 kW and duty 5%. The total gain of both stage is 63 dB.
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