NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

516.5 kHz USB · 2026-09-25 05:00:26Z · 09:16 · received at TREMOLAT (24), FRANCE

Spectrogram of NAVTEX, 516.5 kHz USB, 2026-09-25 05:00:26Z, 09:16: mixed 75% · data 14% · morse 11% · tone 1596 Hz · keying 7.16 Hz depth 0.80
spectrogram 0–6.0 kHz · analysis blocks: morse data mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 9.7 MB ⤓ Opus 2360 kB { }
What was heard
mixed 75% · data 14% · morse 11% · tone 1596 Hz · keying 7.16 Hz depth 0.80 — dominant tone 1596 Hz, keyed at 7.16 Hz (depth 0.8). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, TREMOLAT (24), FRANCE (JN04ku) · Vertical pylon isolated 11 meters (ou Mini-Whip dual FET) · reported SNR 40 dB — thanks to the operator. Receivers
Provenance
sha256 ababf4ea37d20857457562f8b20e3af7930ce79807a6d2e71a9af582f8f69c1e
source 09:16 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-25T0500Z-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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