Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. H2X radar ("Mickey set", AN/APS-15) was an American development of the British H2S radar, the first ground mapping radar to be used in combat. It was used by the USAAF during World War II as a navigation system for daylight overcast and nighttime operations. It used a shorter 3 cm wavelength (10 GHz frequency) than the H2S, giving a sharper picture (H2S subsequently adopted 3 cm in the Mark III version entering operational service in November 18, 1943, for “Battle of Berlin”).

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