INTRODUCTION TO HETERODYNING

Duration: 35 min

Creator: Department of the Air Force (Department of Defense)

Color: B&W

Sound: Optical sound

Description: Defines the terms heterodyning, local oscillator, and mixer. Shows a mixed wave constructed graphically, and lists the frequencies produced by beating two electrical signals together. Uses tuning forks to demonstrate the heterodyning (or mixing) of two sound waves. Discusses the requirements of mixing and the methods of extracting the desired output frequency. (Kinescope)