NIL HEARDRECEPTION LOG

VLF Israel 29.7 kHz submarine broadcast

tier A · carrier

28.7 kHz USB · 2026-10-02 01:39:36Z · 07:43 · received at Montmorillon 86500 FRANCE

Spectrogram of VLF Israel 29.7 kHz submarine broadcast, 28.7 kHz USB, 2026-10-02 01:39:36Z, 07:43: carrier 88% · mixed 8% · keyed-tone 4% · tone 1308 Hz · keying 0.62 Hz depth 0.48
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone carrier mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 7.9 MB ⤓ Opus 2017 kB { }
What was heard
carrier 88% · mixed 8% · keyed-tone 4% · tone 1308 Hz · keying 0.62 Hz depth 0.48 — dominant tone 1308 Hz, keyed at 0.62 Hz (depth 0.48). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, Montmorillon 86500 FRANCE (JN06kj) · Antenna Shared Apex SAL 30 array solution · reported SNR 47 dB — thanks to the operator. Receivers
Provenance
sha256 1da834026518ab37081867487dd173da4009affd3bc94504199c41f7450ccd1d
source 07:43 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-10-02T0139Z-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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