Radio telemetering for testing aircraft in flight

A brief résumé is given of the factors which necessitated the development of thoroughly practicable and reliable telemetering equipment for dynamic testing of high-speed aircraft in flight. An outline of a radio telemetering system is presented which was developed under contract and accepted as suitable for structural flight testing by the United States Navy Bureau of Aeronautics in April 1945. Emphasis is placed upon the electric system and circuits which are of most interest to Institute members. These include the stabilized amplitude modulated subcarrier oscillators, the master amplifier, the air-borne regulated power supply, the frequency modulated transmitter, the automatic frequency controlled frequency modulated receiver, the heterodyne analyzer, and the mobile receiving station.