NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

516.5 kHz USB · 2026-10-04 16:28:11Z · 09:03 · received at Heppen, Limburg, Belgium

Spectrogram of NAVTEX, 516.5 kHz USB, 2026-10-04 16:28:11Z, 09:03: mixed 86% · keyed-tone 7% · morse 4% · data 4% · tone 1585 Hz · keying 0.99 Hz depth 0.97
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone morse data mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 8.2 MB ⤓ Opus 2068 kB { }
What was heard
mixed 86% · keyed-tone 7% · morse 4% · data 4% · tone 1585 Hz · keying 0.99 Hz depth 0.97 — dominant tone 1585 Hz, keyed at 0.99 Hz (depth 0.97). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, Heppen, Limburg, Belgium (JO21oc) · Longwire 54m top 70m above sealevel · reported SNR 36 dB — thanks to the operator. Receivers
Provenance
sha256 ebd3ff9b89b814a07ed548f353a93a82fff8574b1f38f36de948a82a533b9b83
source 09:03 WAV, 12000 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-10-04T1628Z-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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