NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

488.5 kHz USB · 2026-10-02 01:48:10Z · 06:33 · received at Montmorillon 86500 FRANCE

Spectrogram of NAVTEX, 488.5 kHz USB, 2026-10-02 01:48:10Z, 06:33: mixed 45% · data 40% · morse 10% · carrier 5% · tone 1591 Hz · keying 14.31 Hz depth 0.77
spectrogram 0–6.0 kHz · analysis blocks: morse data carrier mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 6.8 MB ⤓ Opus 1749 kB { }
What was heard
mixed 45% · data 40% · morse 10% · carrier 5% · tone 1591 Hz · keying 14.31 Hz depth 0.77 — dominant tone 1591 Hz, keyed at 14.31 Hz (depth 0.77). 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 46 dB — thanks to the operator. Receivers
Provenance
sha256 f902342e07d3707a1dfbbe215f9939b37ef0ae58f7054ac67d80f27b9ff759ea
source 06:33 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-10-02T0148Z-488.5-navtex-490
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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