NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

516.5 kHz USB · 2026-09-25 07:18:10Z · 08:34 · received at Assen | Netherlands

Spectrogram of NAVTEX, 516.5 kHz USB, 2026-09-25 07:18:10Z, 08:34: mixed 77% · data 19% · keyed-tone 4% · tone 1585 Hz · keying 0.20 Hz depth 0.95
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone data mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 9.2 MB ⤓ Opus 2127 kB { }
What was heard
mixed 77% · data 19% · keyed-tone 4% · tone 1585 Hz · keying 0.20 Hz depth 0.95 — dominant tone 1585 Hz, keyed at 0.2 Hz (depth 0.95). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, Assen | Netherlands (JO32fx) · Active Loop antenna PAHGOR (serial nr: 001) built by ► PA0EBC ◀ 👍 · reported SNR 34 dB — thanks to the operator. Receivers
Provenance
sha256 fc20515d2f86fd07a157bab593bbbefaf6ab657e053536ddec2b98d010119b79
source 08:34 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-25T0718Z-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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