VLF submarine band 23.3-25.7 kHz (DHO38, NAA, Russia, Turkey chord)

Field notes from the target list

vlf-23000

VLF submarine band 23.3-25.7 kHz (DHO38, NAA, Russia, Turkey chord) — DHO38 23.4 (400 Hz, off air 07:00-08:00 UTC), NAA Cutler 24.0 (1000 Hz, 673 Twente spots, the most-logged VLF signal), Russia 25.0/25.2 (2000/2200 Hz, ~500 spots), Turkey 25.5 (2500 Hz, 140 spots). Five drones at fixed intervals — a chord that never resolves.

Gallery every take, whether or not its audio is published

• 2026-10-06 15:56Z · 23 kHz
• 2026-10-06 09:59Z · 23 kHz
• 2026-10-06 02:12Z · 23 kHz
• 2026-10-05 19:10Z · 23 kHz
• 2026-10-04 18:32Z · 23 kHz
• 2026-10-03 15:09Z · 23 kHz
• 2026-10-03 08:32Z · 23 kHz
• 2026-10-03 03:10Z · 23 kHz
• 2026-10-02 21:01Z · 23 kHz
• 2026-10-02 08:24Z · 23 kHz
• 2026-10-02 00:49Z · 23 kHz
• 2026-09-27 08:40Z · 23 kHz

All captures

data: index.json