https://peertube.dngr.us/videos/watch/67efed94-9f48-44c6-bc7f-64f6db618650 Join this channel to get access to perks: https://www.youtube.com/channel/UCddem5RlB3bQe99wyY49g0g/join Help us preserve, scan and post more rare and endangered films! Join us on Patreon. Visit https://www.patreon.com/PeriscopeFilm Visit our website www.PeriscopeFilm.com “Radio Set SCR 270: Locating and Reporting Targets” (1949) is a black-and-white military training film produced by the United States Army Signal Corps during World War II. The film details the operation and use of the SCR 270 radio for intercepting enemy aircraft targets. Introduced in 1940, the SCR-270 was one of the first operational early-warning radars. It was the U.S. Army's primary long-distance radar throughout World War II and was deployed around the world. It is also known as the Pearl Harbor Radar, since it was an SCR-270 set that detected the incoming raid about 45 minutes before the December 7, 1941, attack on Pearl Harbor commenced. The SCR 270 was operated by a team of four corpsmen and consisted of a power truck, operating truck, antenna and transmission line, and azimuth scale. The film also details the operational elements of the radio system including the oscilloscope BC-403-B. Established, in 1860, the United States Army Signal Corps is a branch of the United States Army that creates and manages communications and information systems for the command and control of combined arms forces. Film opens, opening credits (0:06). Title text overlaid footage crashing waves (0:27). Camera pans coastline, radio Set SCR 270 comes into view (1:02). View looking out at SCR 270 from window in operating truck (1:25). Officers chart locations of possible enemy aircraft on radar map (1:32). Close-up of oscilloscope BC-403-B (1:45). Close-up of SCR 270 antenna (1:54). Animation depicting how shortwave beams (the output signal) are sent into space (1:58). Output signal depicted on oscilloscope screen (2:05). Return to animation, shortwave beams come into contact with plane, some beams reflected (2:12). Reflected shortwave beams shown on oscilloscope screen (target echo) (2:31). Azimuth scale at base of radio antenna, indicates direction from which target echo is coming from (2:53). Dial on oscilloscope indicates how many miles from target (3:15). Operating crew: Oscilloscope operator, range reader, azimuth reader, plotter (3:45). In-depth explanation of various parts of oscilloscope: On/off switch, intensity control, focus control, vertical adjuster, sensitivity/ signal height control (4:22-). Viewing tube, blocks out excess light (5:33). Range dial, moves image side-to-side; Vernier for fine-tune adjustments (6:52). Rheostat (Azimuth Speed Control), controls rotation of antenna (7:54). View of radar moving as rheostat dial moved in clock-wise, counter clock-wise position (8:24). Oscilloscope operator sets up oscilloscope for scan of targets (9:30). Close-up constant streaky pattern displayed across oscilloscope reader known as “hash” (10:08). Target image begins to appear on oscilloscope screen, three peaks indicating three different targets (10:31). Training of SCR 270 operator team (12:28). Break down of each roles’ responsibilities as they search the assigned area; Close-up of plotter’s board and notes (13:07). Multiple women wearing headsets at information center plot points phoned in by plotters on large map called radar board (14:28). Map showing chain of overlapping sectors, allow for wide area to be covered and monitored (15:05). Example of crew operating in tactical situation: Buzz of planes flying overhead, radar turns and tracks location, operation team records and plots location and reports it back to information center (15:24). Interceptor unit runs out to plane, try and engage enemy aircrafts (17:18). Convoy of perhaps American Bell P-39 Airacobras fly through sky (18:01). Closing credits (18:10). Film ends (18:17). Motion picture films don't last forever; many have already been lost or destroyed. For almost two decades, we've worked to collect, scan and preserve the world as it was captured on 35mm, 16mm and 8mm movies -- including home movies, industrial films, and other non-fiction. If you have endangered films you'd like to have scanned, or wish to donate celluloid to Periscope Film so that we can share them with the world, we'd love to hear from you. Contact us via the weblink below. This film is part of the Periscope Film LLC archive, one of the largest historic military, transportation, and aviation stock footage collections in the USA. Entirely film backed, this material is available for licensing in 24p HD, 2k and 4k. For more information visit http://www.PeriscopeFilm.com Source: https://www.youtube.com/watch?v=bXUWzGj7Oos Mirrored from Periscope Film (https://www.youtube.com/@PeriscopeFilm) Sat, 13 Jun 2026 15:13:09 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://peertube.dngr.us https://peertube.dngr.us/lazy-static/avatars/41a6fee9-7f57-42d0-a5fc-5db4f1af2e31.png https://peertube.dngr.us/videos/watch/67efed94-9f48-44c6-bc7f-64f6db618650 All rights reserved, unless otherwise specified in the terms specified at https://peertube.dngr.us/about and potential licenses granted by each content's rightholder.