NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

488.5 kHz USB · 2026-09-21 17:48:06Z · 10:00 · received at Heppen, Limburg, Belgium

Spectrogram of NAVTEX, 488.5 kHz USB, 2026-09-21 17:48:06Z, 10:00: mixed 63% · data 33% · carrier 3% · tone 1588 Hz
spectrogram 0–6.0 kHz · analysis blocks: data carrier mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 9.8 MB ⤓ Opus 2330 kB { }
What was heard
mixed 63% · data 33% · carrier 3% · tone 1588 Hz — dominant tone 1588 Hz. Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, Heppen, Limburg, Belgium (JO21oc) · Longwire 54m top 70m above sealevel · reported SNR 37 dB — thanks to the operator. Receivers
Provenance
sha256 687f7e76585e77a10c2d236c7db541180bba588edd1f9dfc8a4be8bdcead535b
source 10:00 WAV, 12000 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-21T1748Z-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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