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Monica was a range-only tail warning radar for bombers, introduced by the RAF in June 1942. Officially known as ARI 5664, it operated at the boundary between VHF and UHF frequencies of around 300 MHz. It was developed at the Bomber Support Development Unit in Worcestershire.
The Germans developed a passive radar receiver, Flensburg (FuG 227), which was used by Luftwaffe nightfighters from spring 1944 onward to home in on bombers using Monica. On the morning of 13 July 1944, 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 After examining the Flensburg equipment, the RAF ordered Monica withdrawn from all Bomber Command aircraft.
- "Bf 110 vs. Lancaster", Robert Forczyk, Osprey Publishing, 2013, p. 11
- Price, p. 100.
- Price, p. 154.
- Price, Alfred : Battle Over the Reich (1973) ISBN 0 7110 0481 1
- Forczyk, Robert: Bf 110 vs Lancaster 1942-1945 (2013) ISBN 978 1 78096 3167
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