To start a new topic, it is interesting to note that all of the major combatants of WW II had developed working radar sets prior to the onset of WW II, including Germany, Russia, Japan, Italy, Great Britain, and the United States. More interestingly, Germany had what were probably the best developed sets in 1939. In 1945 Germany was technically behind every other nation listed except Italy, now out of the war and, Russia who depended largely on Western supplied sets in favor of their own limited developments in this field.
Even Japan had exceeded Germany in radar development by mid-war in technical quality (having developed centimetric radar and cavity magnetrons independently....something Germany did by capture of British airborne H2S equipment and took until late 1944 to actually produce working sets) if not in manufacturing quality and quantity. Of course, it was the "tag team" of Britain and the US who out did everyone else in this field.