UNID 6880.0 kHz USB 01:27 UTC 18 MAR 2022
01:27 UTC - UNID intermittently coming on and off with music. Loud and clear when transmitting;
01:34 UTC - Audio linearity sweep test. Rolled off at 5 kHz;
01:38 UTC - Nothing else heard.
RSPduo | Barker & Williamson antenna | Toronto, Ontario Canada