NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

488.5 kHz USB · 2026-09-22 01:50:28Z · 10:00 · received at Assen | Netherlands

Spectrogram of NAVTEX, 488.5 kHz USB, 2026-09-22 01:50:28Z, 10:00: mixed 57% · keyed-tone 37% · carrier 7% · tone 501 Hz · keying 0.20 Hz depth 0.65
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone carrier mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 10.6 MB ⤓ Opus 2577 kB { }
What was heard
mixed 57% · keyed-tone 37% · carrier 7% · tone 501 Hz · keying 0.20 Hz depth 0.65 — dominant tone 501 Hz, keyed at 0.2 Hz (depth 0.65). 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 43 dB — thanks to the operator. Receivers
Provenance
sha256 ab782501013e5232471a2fa2a4bc21293528bb2dbd163eca13b54fde7109265a
source 10:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-22T0150Z-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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