NIL HEARDRECEPTION LOG

NAVTEX

tier A · data

488.5 kHz USB · 2026-09-22 21:50:27Z · 04:15 · received at TREMOLAT (24), FRANCE

Spectrogram of NAVTEX, 488.5 kHz USB, 2026-09-22 21:50:27Z, 04:15: data 46% · mixed 46% · morse 8% · tone 1585 Hz · keying 0.20 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 4.5 MB ⤓ Opus 1065 kB { }
What was heard
data 46% · mixed 46% · morse 8% · tone 1585 Hz · keying 0.20 Hz depth 0.97 — dominant tone 1585 Hz, keyed at 0.2 Hz (depth 0.97). 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 ff0e7492b296f57b2094d303185f208e0630f7cb2954a48f96c402fd1dc7d43f
source 04:15 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-22T2150Z-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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