The CV35¿a velocity-modulation reflection oscillator for wavelengths of about 10 cm

The paper describes a stable tunable oscillator, made in three models covering the waveband from about 8 to 11 cm, which was designed in 1940¿41 as a beating oscillator for superheterodyne receivers, and has since been in manufacture and operational use. The construction is of the disc-seal type, tuning being achieved by the insertion of screw plungers into the resonator. Outputs of 300¿500 mW are obtained at an input of 1300 V, 10 W (efficiency 5%). Dimensional details and characteristics are given, as well as a short account of the experimental development of the valve. The factors affecting the performance are mentioned and the efficiency and stability discussed on the basis of the first order theory of Barford and Manifold. Finally the theoretical efficiency is calculated and seen to be in good agreement with the observed value.