NIL HEARDRECEPTION LOG

DCF77 LF time signal

tier A · keyed-tone

76.5 kHz USB · 2026-09-20 09:27:33Z · 10:00 · received at Ireland

Spectrogram of DCF77 LF time signal, 76.5 kHz USB, 2026-09-20 09:27:33Z, 10:00: keyed-tone 80% · carrier 20% · tone 999 Hz · keying 1.00 Hz depth 0.86
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone carrier
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 10.3 MB ⤓ Opus 2613 kB { }
What was heard
keyed-tone 80% · carrier 20% · tone 999 Hz · keying 1.00 Hz depth 0.86 — dominant tone 999 Hz, keyed at 1.0 Hz (depth 0.86). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, Ireland (IO53mw) · Dipole · reported SNR 32 dB — thanks to the operator. Receivers
Provenance
sha256 66a869f06eeb6a92271b5e426110ea4d3446253e1bb24f304972d89385e21236
source 10:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-20T0927Z-76.5-dcf77-77.5
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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