NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

488.5 kHz USB · 2026-10-02 21:48:56Z · 10:00 · received at Assen | Netherlands

Spectrogram of NAVTEX, 488.5 kHz USB, 2026-10-02 21:48:56Z, 10:00: mixed 83% · keyed-tone 10% · morse 3% · data 3% · tone 501 Hz · keying 1.98 Hz depth 0.84
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone morse data mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 10.8 MB ⤓ Opus 2567 kB { }
What was heard
mixed 83% · keyed-tone 10% · morse 3% · data 3% · tone 501 Hz · keying 1.98 Hz depth 0.84 — dominant tone 501 Hz, keyed at 1.98 Hz (depth 0.84). 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 44 dB — thanks to the operator. Receivers
Provenance
sha256 dcb7adb185e80afe4ceb1222ca6530d0cd08d02c7046f235ca9d9e16c3c4ac40
source 10:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-10-02T2148Z-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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