Synthesized C-band down-converter

Problems involved in the design of a consumer-oriented C-band to 70-MHz single-conversion down-converter are discussed, with particular attention given to the solution of the problem of frequency drift, caused by exposure of the local oscillator to a wide range of temperatures, via frequency synthesis. Amplitude and phase requirements for image rejection are considered. A low-cost fully synthesized television receive-only down-converter has been developed using a UHF television prescaler, precision analog tuning circuitry, and microwave circuitry including the push-pull oscillator and subharmonically pumped mixer.