NIL HEARDRECEPTION LOG

NAVTEX

tier A · data

488.5 kHz USB · 2026-09-20 01:47:43Z · 10:00 · received at Montmorillon 86500 FRANCE

Spectrogram of NAVTEX, 488.5 kHz USB, 2026-09-20 01:47:43Z, 10:00: data 50% · mixed 47% · morse 3% · tone 1591 Hz · keying 14.31 Hz depth 0.97
spectrogram 0–6.0 kHz · analysis blocks: morse data mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 10.7 MB ⤓ Opus 2530 kB { }
What was heard
data 50% · mixed 47% · morse 3% · tone 1591 Hz · keying 14.31 Hz depth 0.97 — dominant tone 1591 Hz, keyed at 14.31 Hz (depth 0.97). 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 43 dB — thanks to the operator. Receivers
Provenance
sha256 ff9729f0372b1261ef746810e3bbfd8e8c2e5005466f312eb6ceffef484137a6
source 10:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-20T0147Z-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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