NIL HEARDRECEPTION LOG

NAVTEX

tier A · data

488.5 kHz USB · 2026-09-25 13:48:12Z · 05:11 · received at Larvik, Norway

Spectrogram of NAVTEX, 488.5 kHz USB, 2026-09-25 13:48:12Z, 05:11: data 50% · mixed 44% · morse 6% · tone 1585 Hz · keying 14.31 Hz depth 0.94
spectrogram 0–6.0 kHz · analysis blocks: morse data mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 5.3 MB ⤓ Opus 1375 kB { }
What was heard
data 50% · mixed 44% · morse 6% · tone 1585 Hz · keying 14.31 Hz depth 0.94 — dominant tone 1585 Hz, keyed at 14.31 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 31 dB — thanks to the operator. Receivers
Provenance
sha256 ae325216343cb996ebd183f08826b7c5d6623f5c2d2753d6b3621057e2d35c51
source 05:11 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-25T1348Z-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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