Sending radio messages

Duration: 0:10:42

Genre: Educational

Year Published: 1943

Creator: Erpi Classroom Films

Format: 16mm

Color: B&W

Sound: sound

Description: Uses animation to demonstrate the basic principles of radio transmission. Explains the operation of microphone, transformer, and modulator. Distinguishes among direct, alternating, and voice currents; and elaborates upon the physical laws relating to carrier waves and amplification. Uses natural photography to show the operation of units in a modern transmission station. Discusses the all-important place of radio in modern living., Uses animation to demonstrate the basic principles of radio transmission. Explains the operation of microphone, transformer, and modulator. Distinguishes among direct, alternating, and voice currents; and elaborates upon the physical laws relating to carrier waves and amplification. Uses natural photography to show the operation of units in a modern transmission station. Discusses the all-important place of radio in modern living.

Complete Record: , Uses animation to demonstrate the basic principles of radio transmission. Explains the operation of microphone, transformer, and modulator. Distinguishes among direct, alternating, and voice currents; and elaborates upon the physical laws relating to carrier waves and amplification. Uses natural photography to show the operation of units in a modern transmission station. Discusses the all-important place of radio in modern living.NOTE: Two (or more) records have been merged together to create this data.