NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

516.5 kHz USB · 2026-10-05 11:18:41Z · 01:07 · received at Wessex - KiwiSDR - G8JNJ - South West UK

Spectrogram of NAVTEX, 516.5 kHz USB, 2026-10-05 11:18:41Z, 01:07: mixed 50% · data 25% · keyed-tone 25% · tone 1600 Hz · keying 0.20 Hz depth 0.95
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone data mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 1.2 MB ⤓ Opus 276 kB { }
What was heard
mixed 50% · data 25% · keyed-tone 25% · tone 1600 Hz · keying 0.20 Hz depth 0.95 — dominant tone 1600 Hz, keyed at 0.2 Hz (depth 0.95). 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 31 dB — thanks to the operator. Receivers
Provenance
sha256 ee4b9d7bb906b12470e3bcf01203abce126b8c97b16f279e77cbb464e7a009a7
source 01:07 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-10-05T1118Z-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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