{"captures":["2026-10-06T0539Z-15851-xpb1-0540","2026-10-02T0538Z-15851-xpb1-0540","2026-09-26T0537Z-15851-xpb1-0540","2026-09-25T0537Z-15851-xpb1-0540","2026-09-22T0604Z-15851-xpb1-0540","2026-09-21T0538Z-15851-xpb1-0540"],"freqs_khz":[15851.0],"kind":"","name":"XPB1 polytone ladder, 05:40 step","slug":"xpb1-0540","tier":"B"}