NIL HEARDRECEPTION LOG

DCF77 LF time signal

tier A · keyed-tone

76.5 kHz USB · 2026-09-24 20:39:09Z · 09:05 · received at Assen | Netherlands

Spectrogram of DCF77 LF time signal, 76.5 kHz USB, 2026-09-24 20:39:09Z, 09:05: keyed-tone 71% · carrier 29% · tone 999 Hz · keying 1.00 Hz depth 0.87
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone carrier
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 9.3 MB ⤓ Opus 2408 kB { }
What was heard
keyed-tone 71% · carrier 29% · tone 999 Hz · keying 1.00 Hz depth 0.87 — dominant tone 999 Hz, keyed at 1.0 Hz (depth 0.87). 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 44 dB — thanks to the operator. Receivers
Provenance
sha256 736573b064b40c71422ddf501e36c0c1f25837847b89d51e23d6f53925273c2b
source 09:05 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-24T2039Z-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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