From C-SPAN's Video Library:

"Historian Harry Butowsky discussed 'The Mystery of Radar in Hawaii.' In 1941 radar was a new technology that was being utilized at Pearl Harbor, but the infrastructure surrounding its monitoring was not fully developed. Mr. Butowsky used many slides while telling the December 7, 1941, story from the point that the Japanese planes were detected on radar to the ongoing discussion of assigning blame for the success of the surprise attack."