NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

516.5 kHz USB · 2026-09-26 14:27:41Z · 10:00 · received at Larvik, Norway

Spectrogram of NAVTEX, 516.5 kHz USB, 2026-09-26 14:27:41Z, 10:00: mixed 97% · keyed-tone 3% · tone 1585 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 10.5 MB ⤓ Opus 2575 kB { }
What was heard
mixed 97% · keyed-tone 3% · tone 1585 Hz · keying 0.20 Hz depth 0.98 — dominant tone 1585 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, Larvik, Norway (JO49xa) · dipole · reported SNR 32 dB — thanks to the operator. Receivers
Provenance
sha256 c6c3b3f7a38f6a66edd62c447737d9660ccfa64db6c5f9e85f856fbb1661056f
source 10:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-26T1427Z-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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