Notes on the stability of LC oscillators

The paper deals with the problem of the stability of LC oscillators, largely from the point of view of the development engineer, and is based on the author´s experience within a limited field. Some familiarity with the art is presumed, though references are given to a number of the more important publications. Sections are devoted to the two fundamental oscillator components, namely the amplifier and the resonator. Methods of thermal compensation are discussed and the importance of humidity is emphasized, a diagram for the permittivity of moist air being included. The paper concludes with a description of the performance of the Franklin oscillator and with experimental oscillators which have been built.