A reflex klystron oscillator for the 8-9 mm band

The paper describes a reflex klystron oscillator, tunable over the wavelength range of 8¿9 mm, which is suitable both for use in a super-heterodyne receiver and as a source for laboratory measurements. The cavity operates in its fundamental mode and tunes smoothly over the wavelength band. It is mounted in a metal envelope having a glass window through which the output power passes. At an input of 2000 volts 10 mA, the output power of an average valve is about 30¿50 mW, and the electronic tuning range to half-power is 60 Mc/s. Powers up to 160 mW have been obtained. The factors affecting the performance of the valve are discussed, and consideration is given to the noise power generated by the oscillator when used in a superheterodyne receiver.