NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

488.5 kHz USB · 2026-09-25 01:48:15Z · 06:53 · received at Assen | Netherlands

Spectrogram of NAVTEX, 488.5 kHz USB, 2026-09-25 01:48:15Z, 06:53: mixed 76% · keyed-tone 19% · morse 5% · tone 501 Hz · keying 2.30 Hz depth 0.69
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone morse mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 7.3 MB ⤓ Opus 1790 kB { }
What was heard
mixed 76% · keyed-tone 19% · morse 5% · tone 501 Hz · keying 2.30 Hz depth 0.69 — dominant tone 501 Hz, keyed at 2.3 Hz (depth 0.69). 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 41 dB — thanks to the operator. Receivers
Provenance
sha256 259c0efa1aac2e5a71c99399d7c7d61e459b811e420a2eeec1207f69a4b0acd0
source 06:53 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-25T0148Z-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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