NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

516.5 kHz USB · 2026-09-18 22:28:19Z · 10:00 · received at Ireland

Spectrogram of NAVTEX, 516.5 kHz USB, 2026-09-18 22:28:19Z, 10:00: mixed 90% · data 3% · carrier 3% · keyed-tone 3% · tone 1542 Hz · keying 0.30 Hz depth 0.98
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone data carrier mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 10.5 MB ⤓ Opus 2610 kB { }
What was heard
mixed 90% · data 3% · carrier 3% · keyed-tone 3% · tone 1542 Hz · keying 0.30 Hz depth 0.98 — dominant tone 1542 Hz, keyed at 0.3 Hz (depth 0.98). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, Ireland (IO53mw) · Dipole · reported SNR 39 dB — thanks to the operator. Receivers
Provenance
sha256 5ebfdaa8fee334de66f73bd623e2068c069e872f6c1639fe800f3725e2ecb0c6
source 10:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-18T2228Z-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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