NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

488.5 kHz USB · 2026-09-24 21:48:50Z · 10:00 · received at Assen | Netherlands

Spectrogram of NAVTEX, 488.5 kHz USB, 2026-09-24 21:48:50Z, 10:00: mixed 77% · data 13% · morse 7% · carrier 3% · tone 1585 Hz · keying 7.25 Hz depth 0.95
spectrogram 0–6.0 kHz · analysis blocks: morse data carrier mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 10.6 MB ⤓ Opus 2567 kB { }
What was heard
mixed 77% · data 13% · morse 7% · carrier 3% · tone 1585 Hz · keying 7.25 Hz depth 0.95 — dominant tone 1585 Hz, keyed at 7.25 Hz (depth 0.95). 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 1b08b543408f7479f4db55cedccb3dbc1f1023a302ecafb9f2d4acdfd517c5ff
source 10:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-24T2148Z-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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