Empty band / atmospherics

tier A · morse

4500 kHz AM · 2026-09-19 04:00:54Z · 09:54 · received at Montmorillon 86500 FRANCE

Spectrogram of Empty band / atmospherics, 4500 kHz AM, 2026-09-19 04:00:54Z, 09:54: noise 93% · morse 3% · keyed-tone 3% · tone 268 Hz · keying 2.98 Hz depth 0.93 — spectrogram 0–6.0 kHz · analysis blocks: keyed-tone morse noise

loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 11.1 MB ⤓ Opus 2240 kB { }

What was heard

noise 93% · morse 3% · keyed-tone 3% · tone 268 Hz · keying 2.98 Hz depth 0.93 — dominant tone 268 Hz, keyed at 2.98 Hz (depth 0.93). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.

Receiver

KiwiSDR, Montmorillon 86500 FRANCE (JN05ot) · Antenna Shared Apex SAL 30 array solution · reported SNR 43 dB — thanks to the operator. Receivers

Provenance

sha256 41a5a6861f8c65994e9aea02f66ba428390a30d32270245ed8708ca4767f4805
source 09:54 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-19T0400Z-4500-quiet-4500

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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