NAVTEX

tier A · data

516.5 kHz USB · 2026-09-18 20:57:46Z · 04:00 · received at TREMOLAT (24), FRANCE

Spectrogram of NAVTEX, 516.5 kHz USB, 2026-09-18 20:57:46Z, 04:00: data 75% · morse 17% · keyed-tone 8% · tone 1596 Hz · keying 7.01 Hz depth 0.76 — spectrogram 0–6.0 kHz · analysis blocks: keyed-tone morse data

loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 4.1 MB ⤓ Opus 1047 kB { }

What was heard

data 75% · morse 17% · keyed-tone 8% · tone 1596 Hz · keying 7.01 Hz depth 0.76 — dominant tone 1596 Hz, keyed at 7.01 Hz (depth 0.76). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.

Receiver

KiwiSDR, TREMOLAT (24), FRANCE (JN04ku) · Vertical pylon isolated 11 meters (ou Mini-Whip dual FET) · reported SNR 43 dB — thanks to the operator. Receivers

Provenance

sha256 9ba208b478c30a15f5bf536d340a85105dc1be5115da076769c155bd33f5c12d
source 04:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-18T2057Z-516.5-navtex-518

Heard in the record

— linked once the record exists.

Notes

rig: 518 kHz NAVTEX, F1B 100 Bd +/-85 Hz SITOR-B; dial 516.5 USB puts mark/space at ~1415/1585 Hz. Slot 21:00-21:10 UTC = Cullercoats (G), then 21:10 Bjuroklubb (H); https://en.wikipedia.org/wiki/List_of_Navtex_stations

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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