NIL HEARDRECEPTION LOG

Russian cluster beacons, 16332 kHz (the freshest cluster)

tier B · keyed-tone

16331.2 kHz USB · 2026-09-22 07:44:14Z · 10:00 · received at Haparanda, Sweden

Spectrogram of Russian cluster beacons, 16332 kHz (the freshest cluster), 16331.2 kHz USB, 2026-09-22 07:44:14Z, 10:00: keyed-tone 100% · tone 521 Hz · keying 2.35 Hz depth 0.98
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 9.5 MB ⤓ Opus 2578 kB { }
What was heard
keyed-tone 100% · tone 521 Hz · keying 2.35 Hz depth 0.98 — dominant tone 521 Hz, keyed at 2.35 Hz (depth 0.98). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, Haparanda, Sweden (KP25ax) · Active whip above 3 MHz, antenna switching below 3 MHz · reported SNR 25 dB — thanks to the operator. Receivers
Provenance
sha256 e74f9724d73802dad7aa4d24afc3511d2a1f5e490b0d64951b22a80ab99a0695
source 10:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-22T0744Z-16331.2-mx-16332
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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