NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

516.5 kHz USB · 2026-09-22 21:28:10Z · 10:00 · received at TREMOLAT (24), FRANCE

Spectrogram of NAVTEX, 516.5 kHz USB, 2026-09-22 21:28:10Z, 10:00: mixed 60% · morse 27% · data 7% · keyed-tone 7% · tone 1600 Hz · keying 1.45 Hz depth 0.80
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone morse data mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 10.4 MB ⤓ Opus 2613 kB { }
What was heard
mixed 60% · morse 27% · data 7% · keyed-tone 7% · tone 1600 Hz · keying 1.45 Hz depth 0.80 — dominant tone 1600 Hz, keyed at 1.45 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 45 dB — thanks to the operator. Receivers
Provenance
sha256 2606b28c2fc6d1078b724109e37a9367f2a72dd3293d4bc9b8ffb037b0afb149
source 10:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-22T2128Z-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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