1989 Event David Letterman becomes 1st network TV series to use dolby stereo 1982 Event WQXI, Atlanta, is 1st to use Harris Corp AM stereo system 1982 Event KHJ (LA) and KFRC (SF) become 2nd and 3rd stereo AM stations 1982 Event FCC approves AM stereo radio, KTSA San Antonio goes stereo 1961 Event FM multiplex stereo broadcasting 1st heard
