NIL HEARDRECEPTION LOG

VLF submarine band 23.3-25.7 kHz (DHO38, NAA, Russia, Turkey chord)

tier A · carrier

23 kHz USB · 2026-10-03 15:09:59Z · 02:21 · received at Heppen, Limburg, Belgium

Spectrogram of VLF submarine band 23.3-25.7 kHz (DHO38, NAA, Russia, Turkey chord), 23 kHz USB, 2026-10-03 15:09:59Z, 02:21: carrier 100% · tone 2048 Hz
spectrogram 0–6.0 kHz · analysis blocks: carrier
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 2.4 MB ⤓ Opus 596 kB { }
What was heard
carrier 100% · tone 2048 Hz — dominant tone 2048 Hz. 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 35 dB — thanks to the operator. Receivers
Provenance
sha256 5d0f416e5d0719ccee63fce97c7ee52d6a57b0046de27cbed27b5db7ab65a220
source 02:21 WAV, 12000 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-10-03T1509Z-23-vlf-23000
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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