NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

516.5 kHz USB · 2026-10-02 04:59:27Z · 01:00 · received at Brettnach F57320

Spectrogram of NAVTEX, 516.5 kHz USB, 2026-10-02 04:59:27Z, 01:00: mixed 67% · keyed-tone 33% · tone 1421 Hz · keying 0.20 Hz depth 0.98
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 1.1 MB ⤓ Opus 259 kB { }
What was heard
mixed 67% · keyed-tone 33% · tone 1421 Hz · keying 0.20 Hz depth 0.98 — dominant tone 1421 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, Brettnach F57320 (JN39GG) · vertical · reported SNR 41 dB — thanks to the operator. Receivers
Provenance
sha256 0d9c179e3552738fc1c3e0e74bc2af72ecc01f2245c07e15d27b2184e3ae1c2b
source 01:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-10-02T0459Z-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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