NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

488.5 kHz USB · 2026-09-26 21:47:41Z · 07:04 · received at Assen | Netherlands

Spectrogram of NAVTEX, 488.5 kHz USB, 2026-09-26 21:47:41Z, 07:04: mixed 68% · keyed-tone 23% · carrier 9% · tone 501 Hz · keying 1.90 Hz depth 0.66
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone carrier mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 7.6 MB ⤓ Opus 1808 kB { }
What was heard
mixed 68% · keyed-tone 23% · carrier 9% · tone 501 Hz · keying 1.90 Hz depth 0.66 — dominant tone 501 Hz, keyed at 1.9 Hz (depth 0.66). 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 45 dB — thanks to the operator. Receivers
Provenance
sha256 b4f95ebed2e19eb3cbfcefa0b395f4d3e5d57958032e2befd659f0c744d9b9ef
source 07:04 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-26T2147Z-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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