NIL HEARDRECEPTION LOG

NAVTEX

tier A · data

488.5 kHz USB · 2026-09-23 21:50:33Z · 09:11 · received at TREMOLAT (24), FRANCE

Spectrogram of NAVTEX, 488.5 kHz USB, 2026-09-23 21:50:33Z, 09:11: data 64% · mixed 21% · morse 14% · tone 1500 Hz · keying 8.88 Hz depth 0.79
spectrogram 0–6.0 kHz · analysis blocks: morse data mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 9.6 MB ⤓ Opus 2343 kB { }
What was heard
data 64% · mixed 21% · morse 14% · tone 1500 Hz · keying 8.88 Hz depth 0.79 — dominant tone 1500 Hz, keyed at 8.88 Hz (depth 0.79). 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 6a619382b9fc35d96ed62a2495ea7594126b4a4c03d4ac2fc7d09f7c01704f24
source 09:11 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-23T2150Z-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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