NIL HEARDRECEPTION LOG

XPB1 polytone ladder, 05:20 step

tier B · mixed

17451 kHz USB · 2026-09-25 05:17:34Z · 05:00 · received at Brettnach F57320

Spectrogram of XPB1 polytone ladder, 05:20 step, 17451 kHz USB, 2026-09-25 05:17:34Z, 05:00: mixed 33% · carrier 20% · keyed-tone 20% · data 13% · morse 13% · tone 1151 Hz · keying 24.97 Hz depth 0.78
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone morse data carrier mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 5.0 MB ⤓ Opus 1400 kB { }
What was heard
mixed 33% · carrier 20% · keyed-tone 20% · data 13% · morse 13% · tone 1151 Hz · keying 24.97 Hz depth 0.78 — dominant tone 1151 Hz, keyed at 24.97 Hz (depth 0.78). 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 40 dB — thanks to the operator. Receivers
Provenance
sha256 7900915c98b62f0572642edd834b228292cb2c44a9eaae254bc5f37ec78321e2
source 05:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-25T0517Z-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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