NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

516.5 kHz USB · 2026-09-26 05:40:32Z · 06:11 · received at Wessex - KiwiSDR - G8JNJ - South West UK

Spectrogram of NAVTEX, 516.5 kHz USB, 2026-09-26 05:40:32Z, 06:11: mixed 90% · carrier 5% · keyed-tone 5% · tone 1498 Hz · keying 0.20 Hz depth 0.98
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone carrier mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 6.5 MB ⤓ Opus 1581 kB { }
What was heard
mixed 90% · carrier 5% · keyed-tone 5% · tone 1498 Hz · keying 0.20 Hz depth 0.98 — dominant tone 1498 Hz, keyed at 0.2 Hz (depth 0.98). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, Wessex - KiwiSDR - G8JNJ - South West UK (IO80qr) · (same as Wessex KiWi V1) · reported SNR 41 dB — thanks to the operator. Receivers
Provenance
sha256 a32e90ddacc111b4b35f8645937364babea43c6db76f17501482d3ffdf2da138
source 06:11 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-26T0540Z-516.5-navtex-518
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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