NIL HEARDRECEPTION LOG

XPB1 polytone ladder, 05:20 step

tier B · data

17451 kHz USB · 2026-10-02 05:19:10Z · 05:00 · received at Brettnach F57320

Spectrogram of XPB1 polytone ladder, 05:20 step, 17451 kHz USB, 2026-10-02 05:19:10Z, 05:00: data 73% · mixed 13% · keyed-tone 7% · morse 7% · tone 1172 Hz · keying 9.13 Hz depth 0.97
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone morse data mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 5.2 MB ⤓ Opus 1264 kB { }
What was heard
data 73% · mixed 13% · keyed-tone 7% · morse 7% · tone 1172 Hz · keying 9.13 Hz depth 0.97 — dominant tone 1172 Hz, keyed at 9.13 Hz (depth 0.97). 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 41 dB — thanks to the operator. Receivers
Provenance
sha256 5862013169b414f1187d554054892b322906461514c11e6a55328c79731af2a1
source 05:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-10-02T0519Z-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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