NIL HEARDRECEPTION LOG

NAVTEX

tier A · carrier

488.5 kHz USB · 2026-09-22 13:48:33Z · 01:37 · received at Larvik, Norway

Spectrogram of NAVTEX, 488.5 kHz USB, 2026-09-22 13:48:33Z, 01:37: carrier 40% · mixed 40% · morse 20% · tone 2226 Hz · keying 14.30 Hz depth 0.94
spectrogram 0–6.0 kHz · analysis blocks: morse carrier mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 1.7 MB ⤓ Opus 411 kB { }
What was heard
carrier 40% · mixed 40% · morse 20% · tone 2226 Hz · keying 14.30 Hz depth 0.94 — dominant tone 2226 Hz, keyed at 14.3 Hz (depth 0.94). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, Larvik, Norway (JO49xa) · dipole · reported SNR 30 dB — thanks to the operator. Receivers
Provenance
sha256 452bf112c859ad0bafd0e03537e7e69f607703623a97868660ee04b754445a86
source 01:37 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-22T1348Z-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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