NIL HEARDRECEPTION LOG

DCF77 LF time signal

tier A · keyed-tone

76.5 kHz USB · 2026-09-26 13:38:29Z · 08:48 · received at Ireland

Spectrogram of DCF77 LF time signal, 76.5 kHz USB, 2026-09-26 13:38:29Z, 08:48: keyed-tone 67% · carrier 18% · mixed 11% · morse 4% · tone 999 Hz · keying 1.00 Hz depth 0.73
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone morse carrier mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 9.3 MB ⤓ Opus 2217 kB { }
What was heard
keyed-tone 67% · carrier 18% · mixed 11% · morse 4% · tone 999 Hz · keying 1.00 Hz depth 0.73 — dominant tone 999 Hz, keyed at 1.0 Hz (depth 0.73). 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 91a0122c8c62a6dfa7c2857967208bc71fe418486abd8ea414c375516906d78d
source 08:48 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-26T1338Z-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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