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Summary: Instructional film about LRASV (Long Range Air to Surface Vessel) radar.
Description: The film recapitulates the principles of ASV as seen in an earlier film (RMY 116) and then explains the working of LRASV (Long Range Air to Surface Vessel), an extension of ASV which makes possible the location of sea targets at a greater range. A transmitting aerial attached to the top of the rear fuselage of a Wellington emits signals to port and starboard which are received by aerials attached to both sides of the plane. The narrower beam of the signal gives it greater intensity, and therefore range, than is obtainable by the sweeping forward beam of ASV. As soon as the target is located by LRASV the plane turns from port to starboard, switches to ASV and homes in on the target. A Wellington demonstrates the effectiveness of LRASV and ASV by locating first a convoy and then a U-boat which it "bombs".