I am being a nit picker here (and thread drifter) Camber
"My favorite example is the RAF bomber pilots who always turned on their IFF sets over Germany, in the belief that it confused radar operated searchlights. The brass encouraged it in the belief that it improved morale, the scientist RV Jones thought this was totally unacceptable as the IFF sets generated radiations that Germans could exploit for detection sooner or later."
I think you are referring to "Monica" an active Tail warning radar. The Hun were quick to exploit it and home passively on it using devices like Flensburg. Using the basis of the radar equation they were capable of homing on it from twice the range it was capable of actually detecting them. This info was withheld from the crews (to their detriment) based on the good morale that Monica was a good defensive system.