NIL HEARDRECEPTION LOG

NAVTEX

tier A · data

488.5 kHz USB · 2026-09-21 21:47:35Z · 10:00 · received at Brettnach F57320

Spectrogram of NAVTEX, 488.5 kHz USB, 2026-09-21 21:47:35Z, 10:00: data 53% · mixed 40% · morse 7% · tone 1598 Hz · keying 14.11 Hz depth 0.87
spectrogram 0–6.0 kHz · analysis blocks: morse data mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 10.8 MB ⤓ Opus 2459 kB { }
What was heard
data 53% · mixed 40% · morse 7% · tone 1598 Hz · keying 14.11 Hz depth 0.87 — dominant tone 1598 Hz, keyed at 14.11 Hz (depth 0.87). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, Brettnach F57320 (JN39GG) · vertical · reported SNR 47 dB — thanks to the operator. Receivers
Provenance
sha256 4b0cec4bb2dbd438287d893285bdb910c282c7c1ab87d5ae89826112ccbb1e5e
source 10:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-21T2147Z-488.5-navtex-490
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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