NIL HEARDRECEPTION LOG

XPB1 polytone ladder, 05:20 step

tier B · data

17451 kHz USB · 2026-09-21 05:17:32Z · 05:00 · received at Assen | Netherlands

Spectrogram of XPB1 polytone ladder, 05:20 step, 17451 kHz USB, 2026-09-21 05:17:32Z, 05:00: data 73% · mixed 13% · morse 7% · keyed-tone 7% · tone 904 Hz · keying 18.01 Hz depth 0.93
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone morse data mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 5.1 MB ⤓ Opus 1284 kB { }
What was heard
data 73% · mixed 13% · morse 7% · keyed-tone 7% · tone 904 Hz · keying 18.01 Hz depth 0.93 — dominant tone 904 Hz, keyed at 18.01 Hz (depth 0.93). 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 f52aa7fca1754ed6ba17370223c356e500bbd938bbad46d033482805c3adeaea
source 05:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-21T0517Z-17451-xpb1-0520
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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