NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

516.5 kHz USB · 2026-09-20 00:27:52Z · 10:00 · received at Montmorillon 86500 FRANCE

Spectrogram of NAVTEX, 516.5 kHz USB, 2026-09-20 00:27:52Z, 10:00: mixed 77% · morse 10% · data 10% · keyed-tone 3% · tone 1588 Hz · keying 0.45 Hz depth 0.90
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone morse data mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 10.6 MB ⤓ Opus 2544 kB { }
What was heard
mixed 77% · morse 10% · data 10% · keyed-tone 3% · tone 1588 Hz · keying 0.45 Hz depth 0.90 — dominant tone 1588 Hz, keyed at 0.45 Hz (depth 0.9). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, Montmorillon 86500 FRANCE (JN05ot) · Antenna Shared Apex SAL 30 array solution · reported SNR 44 dB — thanks to the operator. Receivers
Provenance
sha256 fe95fc3c437bec63fe1baac350a788415b78117a4a90df96ed3c8286bdfc1be8
source 10:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-20T0027Z-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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