NIL HEARDRECEPTION LOG

NAVTEX

tier A · data

488.5 kHz USB · 2026-09-20 21:50:08Z · 09:32 · received at Assen | Netherlands

Spectrogram of NAVTEX, 488.5 kHz USB, 2026-09-20 21:50:08Z, 09:32: data 48% · mixed 34% · morse 14% · carrier 3% · tone 1600 Hz · keying 12.88 Hz depth 0.85
spectrogram 0–6.0 kHz · analysis blocks: morse data carrier mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 10.2 MB ⤓ Opus 2382 kB { }
What was heard
data 48% · mixed 34% · morse 14% · carrier 3% · tone 1600 Hz · keying 12.88 Hz depth 0.85 — dominant tone 1600 Hz, keyed at 12.88 Hz (depth 0.85). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, Assen | Netherlands (JO32fx) · Active Loop antenna PAHGOR (serial nr: 001) built by ► PA0EBC ◀ 👍 · reported SNR 46 dB — thanks to the operator. Receivers
Provenance
sha256 2501b5e9fbb327beb0139eb5d59501470cb0ececdb5b2281bdd066bbfdddb261
source 09:32 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-20T2150Z-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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