H2S radar relates the tale that, due to a misunderstanding between the original developers and Lord Cherwell, science advisor to Winston Churchill, development of the technology was delayed as the engineers thought that Lord Cherwell did not like the idea.
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Bowen had suggested developing a targeting H2S radar based on this principle, but the matter had been forgotten.
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The mapping idea resurfaced in March 1941 when Philip Dee's group was developing a new AI H2S radar, christened "AIS" in reference to its "sentimetric" wavelength.
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The H2S team protested that it would take the Germans two years to develop a centimetric radar once the cavity magnetron fell into their hands, and that there was no reason to believe they were not working on the technology already.
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Air Ministry H2S radar groups had originally formed up at Bawdsey Manor on the eastern coast of England.
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The rest of the original H2S radar group moved there in May 1940, the AI group arriving the day before them.
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In early operations, H2S radar had proved able to detect coastlines at such a great distance that it could be used as a long-range navigation system, allowing the aircraft to fly in all weather.
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Original H2S radar sets were essentially prototype units that were hand-built to equip the Pathfinders with all possible speed.
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Attempts to fix these began even before H2S radar entered service, but a number of problems greatly delayed their entry.
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Dickie pointed out that navigational charts were always produced with north at the top, while the PPI display of H2S radar had the top of the display representing whatever direction the aircraft was flying.
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H2S radar suggested that this would cause significant problems during navigation.
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Resolution of any H2S radar is a function of the wavelength used and the size of the antenna.
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H2S radar had it working in the H2S electronics in a benchtop set on 7 March 1943, and then quickly fit it to Stirling N3724 to make its first flight on 11 March.
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H2S radar was found to be largely useless on these missions; the city was so large that picking out features proved very difficult.
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Roderich transmissions were timed roughly with the scanning speed of the H2S radar antenna, causing a pattern to appear similar to a pinwheel that made it difficult to see the ground between its pulses.
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