Süddeutscher Rundfunk (SDR) or Südfunk was a German public broadcaster serving the northern part of the state of Baden-Württemberg from 1949 to 1998. The networks headquarters were in Stuttgart. The network had numerous MW and FM transmitter throughout its broadcast area. They also had a shortwave outlet on 6030 kHz. I had the fortune to pick up a good share of them, and the network responded with QSL cards for the reception reports I sent to them.
Click on the thumbnails below to better views of the QSL cards.