NIL HEARDRECEPTION LOG

XPB1 polytone ladder, 05:40 step

tier B · mixed

15851 kHz USB · 2026-09-21 05:38:07Z · 05:00 · received at Assen | Netherlands

Spectrogram of XPB1 polytone ladder, 05:40 step, 15851 kHz USB, 2026-09-21 05:38:07Z, 05:00: mixed 67% · keyed-tone 27% · morse 7% · tone 1629 Hz · keying 0.20 Hz depth 0.81
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone morse mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 5.2 MB ⤓ Opus 1279 kB { }
What was heard
mixed 67% · keyed-tone 27% · morse 7% · tone 1629 Hz · keying 0.20 Hz depth 0.81 — dominant tone 1629 Hz, keyed at 0.2 Hz (depth 0.81). 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 39 dB — thanks to the operator. Receivers
Provenance
sha256 6bbe7fd070eaf3f37c3ef2e0195395e8771c5dd4962fd228dbae945a3cb0019f
source 05:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-21T0538Z-15851-xpb1-0540
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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