To set SD output signal in good quality is best to have 720 or 1080 input signal and processing of SSW set to 720 or 1080p. to set SDI OUT to SD signal please follow these instructions:
1.Open Blackmagic Desktop video setup application
2.Select DeckLink Mini monitor and go to settings
3. Go to conversions
4.Select HD to SD
5.Set desired Display mode Anamorphic or Letterbox. Then press Save
6. Start SSW. If the Recording is set to 720 or 1080 the out at SDI out will in SD format based at selected FPS.