NIL HEARDRECEPTION LOG

WWV HamSCI test signal (minute 8)

tier A · keyed-tone

10000 kHz AM · 2026-09-23 07:07:25Z · 03:00 · received at Shrewsbury, Vermont, USA

Spectrogram of WWV HamSCI test signal (minute 8), 10000 kHz AM, 2026-09-23 07:07:25Z, 03:00: keyed-tone 100% · tone 683 Hz · keying 0.25 Hz depth 0.69
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 3.3 MB ⤓ Opus 710 kB { }
What was heard
keyed-tone 100% · tone 683 Hz · keying 0.25 Hz depth 0.69 — dominant tone 683 Hz, keyed at 0.25 Hz (depth 0.69). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, Shrewsbury, Vermont, USA (FN33om) · 82m (270ft) center fed doublet @ 20m (65ft) MF through HF · reported SNR 31 dB — thanks to the operator. Receivers
Provenance
sha256 183fc0882536657cd013a99e74c110585bce0a7e9636407a3f1ddbcf1619f4d2
source 03:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-23T0707Z-10000-wwv-hamsci-10000
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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