Unknown VLF signal ~12.5 kHz. Interference every 10-30 minutes: 2-3 ~12.5 KHz tones, separated by approximately a second.
I/Q Raw Recording
Unknown 0p0125. A unidentifiable VLF signal at ~12.5 kHzKiloHertz (kHz) 10^3 Hz. The signal randomly interferes with an audio line around every 10 to 30 minutes: always between 2 to 4 ~12.5 kHzKiloHertz (kHz) 10^3 Hz tones, separated by approximately one second.