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

tier A · mixed

23 kHz USB · 2026-10-02 08:24:50Z · 10:00 · received at South West England, UK

Spectrogram of VLF submarine band 23.3-25.7 kHz (DHO38, NAA, Russia, Turkey chord), 23 kHz USB, 2026-10-02 08:24:50Z, 10:00: mixed 57% · keyed-tone 37% · morse 3% · carrier 3% · tone 999 Hz · keying 2.20 Hz depth 0.76 — spectrogram 0–6.0 kHz · analysis blocks: keyed-tone morse carrier mixed

loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 10.9 MB ⤓ Opus 2482 kB { }

What was heard

mixed 57% · keyed-tone 37% · morse 3% · carrier 3% · tone 999 Hz · keying 2.20 Hz depth 0.76 — dominant tone 999 Hz, keyed at 2.2 Hz (depth 0.76). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.

Receiver

KiwiSDR, South West England, UK (IO80qr) · Switched · reported SNR 35 dB — thanks to the operator. Receivers

Provenance

sha256 c5b1ca3a28aaf79c62cdace8387b9fb1f3423e1edccb28866026a79958280398
source 10:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-10-02T0824Z-23-vlf-23000

Heard in the record

— linked once the record exists.

Licence

CC BY 4.0 — credit NIL HEARD / Reception Log. The recording is ours; the transmission is somebody else's. Descriptions describe sound, never content — why.

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