NIL HEARDRECEPTION LOG

NAVTEX

tier A · mixed

516.5 kHz USB · 2026-10-01 17:49:22Z · 01:00 · received at Heppen, Limburg, Belgium

Spectrogram of NAVTEX, 516.5 kHz USB, 2026-10-01 17:49:22Z, 01:00: mixed 33% · keyed-tone 33% · data 33% · tone 1576 Hz · keying 7.15 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 0.9 MB ⤓ Opus 227 kB { }
What was heard
mixed 33% · keyed-tone 33% · data 33% · tone 1576 Hz · keying 7.15 Hz depth 0.95 — dominant tone 1576 Hz, keyed at 7.15 Hz (depth 0.95). 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 2199147d2d31089795e3432c42d889f258fe9b0b34a9b2d44c66c6a2e88e0456
source 01:00 WAV, 12000 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-10-01T1749Z-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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