NIL HEARDRECEPTION LOG

Empty band / atmospherics

tier A · keyed-tone

4500 kHz AM · 2026-09-23 01:00:17Z · 10:00 · received at TREMOLAT (24), FRANCE

Spectrogram of Empty band / atmospherics, 4500 kHz AM, 2026-09-23 01:00:17Z, 10:00: noise 97% · keyed-tone 3% · tone 513 Hz · keying 1.00 Hz depth 0.93
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone noise
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 11.2 MB ⤓ Opus 2306 kB { }
What was heard
noise 97% · keyed-tone 3% · tone 513 Hz · keying 1.00 Hz depth 0.93 — dominant tone 513 Hz, keyed at 1.0 Hz (depth 0.93). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, TREMOLAT (24), FRANCE (JN04ku) · Vertical pylon isolated 11 meters (ou Mini-Whip dual FET) · reported SNR 42 dB — thanks to the operator. Receivers
Provenance
sha256 827aaf7c95372e32c79b4fc5e54fc2f9bf667179cf8c639389e42c90700ca6fe
source 10:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-23T0100Z-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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