NIL HEARDRECEPTION LOG

NAVTEX

tier A · morse

516.5 kHz USB · 2026-10-04 18:38:25Z · 01:22 · received at Hamburg, Drage, 🇩🇪 Germany 🇩🇪

Spectrogram of NAVTEX, 516.5 kHz USB, 2026-10-04 18:38:25Z, 01:22: morse 100% · tone 1600 Hz · keying 0.35 Hz depth 0.79
spectrogram 0–6.0 kHz · analysis blocks: morse
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 1.4 MB ⤓ Opus 348 kB { }
What was heard
morse 100% · tone 1600 Hz · keying 0.35 Hz depth 0.79 — dominant tone 1600 Hz, keyed at 0.35 Hz (depth 0.79). 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 43 dB — thanks to the operator. Receivers
Provenance
sha256 4ece326b8a5dd87ad496fc94ced2dfe5538276e613cab5da6df89fda99d330d2
source 01:22 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-10-04T1838Z-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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