Russian cluster beacons (MX)

tier B · keyed-tone

7038.3 kHz USB · 2026-09-20 18:43:18Z · 10:00 · received at Heppen, Limburg, Belgium

Spectrogram of Russian cluster beacons (MX), 7038.3 kHz USB, 2026-09-20 18:43:18Z, 10:00: keyed-tone 53% · carrier 37% · morse 7% · data 3% · tone 1740 Hz · keying 0.30 Hz depth 0.98 — spectrogram 0–6.0 kHz · analysis blocks: keyed-tone morse data carrier

loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 10.0 MB ⤓ Opus 2403 kB { }

What was heard

keyed-tone 53% · carrier 37% · morse 7% · data 3% · tone 1740 Hz · keying 0.30 Hz depth 0.98 — dominant tone 1740 Hz, keyed at 0.3 Hz (depth 0.98). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.

Receiver

KiwiSDR, Heppen, Limburg, Belgium (JO21oc) · Longwire 54m top 70m above sealevel · reported SNR 38 dB — thanks to the operator. Receivers

Provenance

sha256 73171242e8bdaae526a3bca6b1dad0fb6be1250e7bcd50ad603ac913a468e384
source 10:00 WAV, 12000 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-20T1843Z-7038.3-mx-7039

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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