NIL HEARDRECEPTION LOG

DCF77 LF time signal

tier A · keyed-tone

76.5 kHz USB · 2026-09-20 21:00:35Z · 03:35 · received at Assen | Netherlands

Spectrogram of DCF77 LF time signal, 76.5 kHz USB, 2026-09-20 21:00:35Z, 03:35: keyed-tone 91% · carrier 9% · 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 3.6 MB ⤓ Opus 950 kB { }
What was heard
keyed-tone 91% · carrier 9% · 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, Assen | Netherlands (JO32fx) · Active Loop antenna PAHGOR (serial nr: 001) built by ► PA0EBC ◀ 👍 · reported SNR 46 dB — thanks to the operator. Receivers
Provenance
sha256 3309520e1f5caa69861e43abd60e9ee0b0617f7d7549588c1c182bde29d1c388
source 03:35 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-20T2100Z-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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