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Radio Electronics History: Radio Receivers 1949 Antennas, Superhet, vacuum tubes

Vintage Electronics: Radio Technology Training film of 1949 covers basic principles of RADIO RECEIVERS. Very technical and but well-paced instructional film shows all the major components of RADIO and how they work, using a large wall-sized demonstration panel. Good information for beginner or intermediate level knowledge. Partially restored from 1949 16mm film, originally produced by the International Civil Aviation Organization (ICAO), and distributed by the National Film Board of Canada. Good condition for a 72 year old documentary. (Upscaled to show detail of the demonstration panels.) Run time: just under 28 mins. Uploaded by Computer History Archives Project for educational and historic value. (We actually learned a lot watching this film, hope you enjoy it as well! ~ CHAP) Segments: 00:20 Helicopter takes off; pilot adjusts his radio 01:00 radio antenna diagram, with tuner, detector, reproducer 02:03 vintage crystal radio set with crystal diode 03:07 Large Demonstration Panels showing a working model of radio receiver are explained 04:05 block diagram of how a radio receiver functions 06:17 wall panel illustration continues 06:30 Oscilloscope is used to observe wave forms 07:00 Signal Generator is used to modulate a carrier wave with a test tone (using a “Heathkit Laboratory Generator”) 07:33 Oscilloscope connected to antenna shows signal wave 08:00 Explanations of different types of tubes in a receiver circuit 17:40 Oscilloscope signals demonstrated (in and out of phase) Experimenting with different circuit configurations, discussion of superheterodyne, use of tubes vs. transistors, etc. Definitions: A superheterodyne receiver (often shortened to superhet) is a type of radio receiver that uses frequency mixing to convert a received signal to a fixed intermediate frequency (IF) which can be more conveniently processed than the original carrier frequency. ICAO The International Civil Aviation Organization ("ICAO") is a specialized and funding agency of the United Nations. It changes the principles and techniques of international air navigation and fosters the planning and development of international air transport to ensure safe and orderly growth. Its headquarters are located in Montreal, Quebec, Canada. With special thanks to Speakeasy Archives for digital scanning of original film. http://www.speakeasyarchives.com