NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

516.5 kHz USB · 2026-09-22 03:29:37Z · 01:00 · received at Assen | Netherlands

Spectrogram of NAVTEX, 516.5 kHz USB, 2026-09-22 03:29:37Z, 01:00: mixed 67% · morse 33% · tone 1585 Hz · keying 7.16 Hz depth 0.95
spectrogram 0–6.0 kHz · analysis blocks: morse mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 1.1 MB ⤓ Opus 250 kB { }
What was heard
mixed 67% · morse 33% · tone 1585 Hz · keying 7.16 Hz depth 0.95 — dominant tone 1585 Hz, keyed at 7.16 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 42 dB — thanks to the operator. Receivers
Provenance
sha256 3f597d19618b455e273f61229257d2f46b3a7d90c72cd32361cb8fd28dfc941c
source 01:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-22T0329Z-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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