NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

516.5 kHz USB · 2026-09-25 17:59:15Z · 07:31 · received at Hamburg, Drage, 🇩🇪 Germany 🇩🇪

Spectrogram of NAVTEX, 516.5 kHz USB, 2026-09-25 17:59:15Z, 07:31: mixed 91% · data 4% · carrier 4% · tone 1585 Hz
spectrogram 0–6.0 kHz · analysis blocks: data carrier mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 8.0 MB ⤓ Opus 1910 kB { }
What was heard
mixed 91% · data 4% · carrier 4% · tone 1585 Hz — dominant tone 1585 Hz. Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, Hamburg, Drage, 🇩🇪 Germany 🇩🇪 (JO53dk) · VLF broadband vertical V1.2 08/26 · reported SNR 39 dB — thanks to the operator. Receivers
Provenance
sha256 648c031ff76296379a10d2b6eca1f9d6bb8c406e52aa4c82e9525ba54d6ebdfc
source 07:31 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-25T1759Z-516.5-navtex-518
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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