[kirche]

The exact date I don't know.
Have the following information: "The bombers the Long-range Aircraft (ADD), starting from August 1943 in areas of expected fighters and anti-aircraft artillery along the route threw wads of paper metallized strips of length 25-30 cm for jamming radar detection of air targets, radar vectoring fighter aircraft and stations aiming gun anti-aircraft artillery.
The moment you enter the aircraft in the detection zone of the radar was determined using radar detectors type SOL-3/SOL-3A.
Packs reflectors were thrown out manually (through the hatch of the cabin air gunner) with a time interval of about 10 seconds. In each regiment for jamming stood out for 2-3 plane. Simultaneously with the creation of interference was carried out maneuver the aircraft on course, altitude and speed.
The initiators and organizers of the military application of these passive jamming were the staff officers ADD - Aleksander Pavlovich Chernyshov and Aleksander Vasilyevich Delnov"

In June 1943 already took the famous RAID on Hamburg when the mass was used "Window" - the Russians must have known about it... Maybe knew about before.