NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

516.5 kHz USB · 2026-09-21 22:57:55Z · 08:47 · received at Brettnach F57320

Spectrogram of NAVTEX, 516.5 kHz USB, 2026-09-21 22:57:55Z, 08:47: mixed 52% · data 26% · morse 18% · carrier 4% · tone 1591 Hz · keying 11.66 Hz depth 0.95
spectrogram 0–6.0 kHz · analysis blocks: morse data carrier mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 9.4 MB ⤓ Opus 2169 kB { }
What was heard
mixed 52% · data 26% · morse 18% · carrier 4% · tone 1591 Hz · keying 11.66 Hz depth 0.95 — dominant tone 1591 Hz, keyed at 11.66 Hz (depth 0.95). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, Brettnach F57320 (JN39GG) · vertical · reported SNR 47 dB — thanks to the operator. Receivers
Provenance
sha256 995282a0000b3074da02168c0c9936b5311d1f40d11e260cbd8c7e258f38db7a
source 08:47 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-21T2257Z-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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