NIL HEARDRECEPTION LOG

DCF77 LF time signal

tier A · keyed-tone

76.5 kHz USB · 2026-09-21 14:58:48Z · 05:23 · received at Heppen, Limburg, Belgium

Spectrogram of DCF77 LF time signal, 76.5 kHz USB, 2026-09-21 14:58:48Z, 05:23: keyed-tone 94% · carrier 6% · tone 999 Hz · keying 1.00 Hz depth 0.78
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone carrier
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 5.4 MB ⤓ Opus 1263 kB { }
What was heard
keyed-tone 94% · carrier 6% · tone 999 Hz · keying 1.00 Hz depth 0.78 — dominant tone 999 Hz, keyed at 1.0 Hz (depth 0.78). 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 32 dB — thanks to the operator. Receivers
Provenance
sha256 c044fef2b61c81d0771cc8f29c7515b61d507b67778fd975f0607caa168325cb
source 05:23 WAV, 12000 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-21T1458Z-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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