6220: Mystery Radio @ 19.48. SINPO 44444. Also checked at 21.06 UTC, giving out 21.07 UTC an ID, with SINPO 54554. Sign-off at 23.09 UTC.
6630 (USB): Snowball Radio @ 20.30. SINPO 13222. ID at 20.30 - three times giving out the ID: "Radio Snowball, Snowball, Snowball" in English. Mostly rap, heavy music. Later, around 20.45, reception significantly improved. Here is the recording (audio was much better than in this recording - something wrong happened with a cable socket, so some connection-originated buzz occurred):