Monica tail warning radar

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Monica was a range-only tail warning radar for bombers, introduced by the RAF in the spring of 1942. It operated at frequencies of around 300 MHz.

Unfortunately for the RAF, the Germans quickly developed a passive radar receiver, Flensburg (FuG 227), which was used by Luftwaffe nightfighters from Spring 1944 to home-in on bombers using Monica. However Monica aircraft did not suffer increased casualty rate overall. On the morning of 1944-07-13, a Junkers Ju 88G-1 nightfighter equipped with Flensburg mistakenly landed at RAF Woodbridge. After examining the Flensburg equipment, the RAF ordered Monica withdrawn from all Bomber Command aircraft.

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