NIL HEARDRECEPTION LOG

DWD Hamburg RTTY weather DDH7

tier A · keyed-tone

7644.5 kHz USB · 2026-09-23 20:39:24Z · 04:51 · received at Brettnach F57320

Spectrogram of DWD Hamburg RTTY weather DDH7, 7644.5 kHz USB, 2026-09-23 20:39:24Z, 04:51: keyed-tone 33% · mixed 27% · carrier 20% · data 13% · morse 7% · tone 1274 Hz · keying 0.23 Hz depth 0.93
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone morse data carrier mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 5.2 MB ⤓ Opus 1214 kB { }
What was heard
keyed-tone 33% · mixed 27% · carrier 20% · data 13% · morse 7% · tone 1274 Hz · keying 0.23 Hz depth 0.93 — dominant tone 1274 Hz, keyed at 0.23 Hz (depth 0.93). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, Brettnach F57320 (JN39GG) · vertical · reported SNR 43 dB — thanks to the operator. Receivers
Provenance
sha256 2bd5fc3dbd382b2b40a2c2cc1e04cc81526df508387ae38829ebfaf63bebedf4
source 04:51 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-23T2039Z-7644.5-rtty-7646
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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