NIL HEARDRECEPTION LOG

NAVTEX

tier A · data

488.5 kHz USB · 2026-09-21 01:50:09Z · 10:00 · received at Montmorillon 86500 FRANCE

Spectrogram of NAVTEX, 488.5 kHz USB, 2026-09-21 01:50:09Z, 10:00: data 47% · mixed 20% · keyed-tone 20% · morse 10% · carrier 3% · tone 504 Hz · keying 2.15 Hz depth 0.79
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone morse data carrier mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 10.6 MB ⤓ Opus 2551 kB { }
What was heard
data 47% · mixed 20% · keyed-tone 20% · morse 10% · carrier 3% · tone 504 Hz · keying 2.15 Hz depth 0.79 — dominant tone 504 Hz, keyed at 2.15 Hz (depth 0.79). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, Montmorillon 86500 FRANCE (JN05ot) · Antenna Shared Apex SAL 30 array solution · reported SNR 41 dB — thanks to the operator. Receivers
Provenance
sha256 6dc290f2887a301b01319ae170c7e4f9709c20a6d206d72045c28e8fd34a7dce
source 10:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-21T0150Z-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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