BASIC PRINCIPLES OF FREQUENCY MODULATION 1944 U.S. WAR DEPARTMENT FILM FM RADIO 86794

Love our channel? Help us save and post more orphaned films! Support us on Patreon: Even a really tiny contribution can make a difference. Made during WWII by the War Department, this official training film describes what frequency modulation (FM) is and how to use it in reference to radio communications. It also provides the comparison between FM and AM radio as far as what advantages FM has over AM. Originally restricted, the film was released for public educational use in 1949. It opens with U.S. soldiers playing ping pong while listening to AM radio (:28). When one of the men begins to use an electric razor, the radio gets staticky and one of the men switches the radio to FM so they can still listen to the music clearly (1:02). FM was a major step forward in radio and as guests tuned into a radio programs now they were listening to what the microphone was picking up (1:24). AM radio had its drawbacks in the sense that whenever it was used for communicatio