page_title: Photographic Display Unit
hierarchical_section_title: Photographic Display Unit
context_page_description: The Photographic Display Unit, or PDU, was a large-format display system used by the Royal Air Force to present radar images for interpretation by a number of operators and commanders. Made by Kelvin Hughes, it projected a 6 feet diameter image that could optionally be overlaid with a map and range rings. The PDU was originally designed for the ROTOR system and subsequent AMES Type 80-based Master Radar Stations. A smaller version with a 24 inches display was used onboard Royal Navy ships, and a larger version projected onto movie screens was used in the SAGE system in the US.
context_section_description: The Photographic Display Unit, or PDU, was a large-format display system used by the Royal Air Force to present radar images for interpretation by a number of operators and commanders. Made by Kelvin Hughes, it projected a 6 feet (1.8 m) diameter image that could optionally be overlaid with a map and range rings. The PDU was originally designed for the ROTOR system and subsequent AMES Type 80-based Master Radar Stations. A smaller version with a 24 inches (610 mm) display was used onboard Royal Navy ships, and a larger version projected onto movie screens was used in the SAGE system in the US.
caption: In the SAGE displays, the imagery was generated by the FSQ-7 computer, not directly from the radar display.
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