VII radar, the first production microwave radar for aircraft. He then headed the company's research on microwave radar development. The range gated pulsed Doppler microwave radar operates in low grazing angle mode. They created a radical new design, the cavity magnetron, that made microwave radar possible. Ridenour led the development of airborne microwave radar nicknamed "Micky" which allowed bombing through clouds. Bell also worked on their own microwave radar as a backup project. FINDER uses microwave radar to detect breathing and pulses. The dual frequency microwave radar transmits two microwave frequencies simultaneously. In 1945, her traditional spotting scopes were replaced with Mark 27 microwave radar sets. During World War II, he worked on microwave radar development at the MIT Radiation Laboratory. The USAAF outfitted its first two microwave radar equipped B-24s in September 1942. Microwave radar promised to be small, lighter and more efficient than older types.