NIL HEARDRECEPTION LOG

VLF Israel 29.7 kHz submarine broadcast

tier A · carrier

28.7 kHz USB · 2026-10-02 08:44:13Z · 10:00 · received at Heppen, Limburg, Belgium

Spectrogram of VLF Israel 29.7 kHz submarine broadcast, 28.7 kHz USB, 2026-10-02 08:44:13Z, 10:00: carrier 80% · keyed-tone 20% · tone 3155 Hz · keying 0.23 Hz depth 0.57
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone carrier
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 9.8 MB ⤓ Opus 2276 kB { }
What was heard
carrier 80% · keyed-tone 20% · tone 3155 Hz · keying 0.23 Hz depth 0.57 — dominant tone 3155 Hz, keyed at 0.23 Hz (depth 0.57). 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 31 dB — thanks to the operator. Receivers
Provenance
sha256 b1f124054a5e983c0e1bbda057fb5c17a3848dc859a758187f738b9ccbe39721
source 10:00 WAV, 12000 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-10-02T0844Z-28.7-vlf-28700
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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