NIL HEARDRECEPTION LOG

NAVTEX

tier A · morse

488.5 kHz USB · 2026-09-24 01:47:41Z · 02:04 · received at Wessex - KiwiSDR - G8JNJ - South West UK

Spectrogram of NAVTEX, 488.5 kHz USB, 2026-09-24 01:47:41Z, 02:04: morse 57% · mixed 43% · tone 501 Hz · keying 2.48 Hz depth 0.75
spectrogram 0–6.0 kHz · analysis blocks: morse mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 2.1 MB ⤓ Opus 592 kB { }
What was heard
morse 57% · mixed 43% · tone 501 Hz · keying 2.48 Hz depth 0.75 — dominant tone 501 Hz, keyed at 2.48 Hz (depth 0.75). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, Wessex - KiwiSDR - G8JNJ - South West UK (IO80qr) · (same as Wessex KiWi V1) · reported SNR 42 dB — thanks to the operator. Receivers
Provenance
sha256 9ccc17cdf500b5f78bf49bc1b174048cc3e5335e7ea0580eca41b48a5f4d58cc
source 02:04 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-24T0147Z-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.
Related