Abstract :
The paper presents a brief historical review of the development of power supplies for aircraft communication equipment. A study is made of the aircraft general electrical system in so far as it affects radio power supply, particular attention being paid to the system voltage and the means employed for its regulation. A brief mention is made of the only experimental a.c. system which has yet been applied in this field. The various forms in which power is required by communication equipment are summarized. The paper gives a description of the assembly of the various components forming the power unit, giving by way of illustration some details of a typical power unit. A section of the paper is devoted to description of the voltage-conversion apparatus used. The broad principles and performance of the rotary transformer are described, with an outline of its design and application. The principal types of vibrator are described, with an outline of the design and performance of a particular type developed for Air Ministry service. The specialized requirements of transformers for vibrator convenors, and the application of vibrator convertors to the field of radio power supply are briefly discussed. The chief methods of providing control of voltage in radio power supplies are described.
