15105 UNID. Presumed to be VoKorea (D.P.R.K) - Kujang with a test transmission as there is no broadcast scheduled at 0305. Korean sounding song with female vocal when I first tuned in. Suddenly no audio at 0308 - just carrier. Then a transmitter test tone at 0322. Next at 0326, some sort of strange unidentified data transmission on the carrier. Finally, the VoK interval signal began at exactly 0330 and into the usual Mandarin service to SEAs. Monitored both here at Mount Evelyn (fair signal) and through the remote SDR in Chiba, Japan (excellent signal). Quite odd! Apr 19.