NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

516.5 kHz USB · 2026-09-20 21:40:11Z · 04:31 · received at Assen | Netherlands

Spectrogram of NAVTEX, 516.5 kHz USB, 2026-09-20 21:40:11Z, 04:31: mixed 50% · data 29% · morse 21% · tone 1600 Hz · keying 0.90 Hz depth 0.79
spectrogram 0–6.0 kHz · analysis blocks: morse data mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 4.8 MB ⤓ Opus 1124 kB { }
What was heard
mixed 50% · data 29% · morse 21% · tone 1600 Hz · keying 0.90 Hz depth 0.79 — dominant tone 1600 Hz, keyed at 0.9 Hz (depth 0.79). 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 46 dB — thanks to the operator. Receivers
Provenance
sha256 f548dd8fa66c099a7daa9c2645607139b02b8d170da03fb9c49c918f8e5a29c4
source 04:31 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-20T2140Z-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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