Monica was a range-only tail warning radar for bombers, introduced by the RAF in June 1943. It operated at frequencies of 190-220 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. 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 After examining the Flensburg, the RAF ordered Monica withdrawn from all Bomber Command aircraft.
External Links
Oral History of Defence Electronics (http://histru.bournemouth.ac.uk/CHiDE/Oral_History_of_Defence_Electronics/Yarborough_4.htm)
The radar had also picked up the F-94 and was directing it toward its target when suddenly the unidentified target slowed down, stopped, and reversed its course.
They were making one last pass almost directly over the radar station when the radar operator in the back seat of the F-94 yelled over the interphone that he had a target on his scope.
As Hallstrom approached Santa Monica at 7,500 feet altitude, the sky was clear except for a smog layer in the vicinity of Los Angeles International Airport.
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