NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

488.5 kHz USB · 2026-09-24 17:49:14Z · 05:30 · received at Assen | Netherlands

Spectrogram of NAVTEX, 488.5 kHz USB, 2026-09-24 17:49:14Z, 05:30: mixed 71% · carrier 12% · data 12% · morse 6% · tone 501 Hz · keying 14.31 Hz depth 0.97
spectrogram 0–6.0 kHz · analysis blocks: morse data carrier mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 5.9 MB ⤓ Opus 1388 kB { }
What was heard
mixed 71% · carrier 12% · data 12% · morse 6% · tone 501 Hz · keying 14.31 Hz depth 0.97 — dominant tone 501 Hz, keyed at 14.31 Hz (depth 0.97). 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 36 dB — thanks to the operator. Receivers
Provenance
sha256 0957c1a1ce0e5c9b4dcdbf7926743eca424071317b4548026c9fdef56c1297d9
source 05:30 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-24T1749Z-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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