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Title:RADIO LOCATION (RDF) PART 4 : types of echo [Main Title]
Film Number:ADM 2553
Summary: Fourth in a series of radio location training films.
Description: Mainly concerned with the diagrammatic representation of echoes as an aid to identification. Differences between 'battleship' and 'destroyer' echoes. Friendly planes' signal on screen. Cloud echoes. IFF distress signal for aircraft.