Frequency - Modulated Audio-Frequency Oscillator for Calibrating Flutter-Measuring Equipment

P. V. Smith, Edward Stanko

This paper describes an electronically frequency-modulated oscillator of the resistance-capacitance type which has been developed to facilitate rapid and accurate calibration and testing of flutter-measuring equipment; specifically, of the portable flutter indicator used in theater service work. It supersedes mechanically driven capacitor devices for producing the frequency-modulated 3000-cycle signal used for flutter-indicator calibration. It possesses the advantages of better frequency stability, purer wave form, and absence of spurious output impulses.

Print ISSN
Published
1949-03
Content type
Original Research
DOI
10.5594/J12530