NIL HEARDRECEPTION LOG

VLF submarine band 17.6-20.0 kHz (RDL, HWU, GBZ chord)

tier A · mixed

17.3 kHz USB · 2026-10-03 08:09:43Z · 07:37 · received at Montmorillon 86500 FRANCE

Spectrogram of VLF submarine band 17.6-20.0 kHz (RDL, HWU, GBZ chord), 17.3 kHz USB, 2026-10-03 08:09:43Z, 07:37: mixed 100%
spectrogram 0–6.0 kHz · analysis blocks: mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 8.3 MB ⤓ Opus 1888 kB { }
What was heard
mixed 100%. Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, Montmorillon 86500 FRANCE (JN06kj) · Antenna Shared Apex SAL 30 array solution · reported SNR 42 dB — thanks to the operator. Receivers
Provenance
sha256 604e62163f77f842a93968e8b307fc77d4f56f894d07f6790da014ad3d8c59eb
source 07:37 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-10-03T0809Z-17.3-vlf-17300
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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