NIL HEARDRECEPTION LOG

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

tier A · mixed

23 kHz USB · 2026-10-02 21:01:10Z · 10:00 · received at Assen | Netherlands

Spectrogram of VLF submarine band 23.3-25.7 kHz (DHO38, NAA, Russia, Turkey chord), 23 kHz USB, 2026-10-02 21:01:10Z, 10:00: mixed 90% · data 7% · carrier 3% · tone 401 Hz
spectrogram 0–6.0 kHz · analysis blocks: data carrier mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 10.0 MB ⤓ Opus 2484 kB { }
What was heard
mixed 90% · data 7% · carrier 3% · tone 401 Hz — dominant tone 401 Hz. Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, Assen | Netherlands (JO32fx) · Active Loop antenna PAHGOR (serial nr: 001) built by ► PA0EBC ◀ 👍 · reported SNR 44 dB — thanks to the operator. Receivers
Provenance
sha256 e22e36271ede9e4b8d9ccb8f994ceaa731b43e7f605d1a87701fedb38f5aca9c
source 10:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-10-02T2101Z-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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