Delta Oscar 3900 Khz Delta Oscar is in QSO with Henri on 3900 Khz LSB-mode at 2115 Utc with SINPO 14321. Share this: Click to share on X (Opens in new window) X Click to share on Facebook (Opens in new window) Facebook Click to email a link to a friend (Opens in new window) Email Click to print (Opens in new window) Print Related