{
  "ok": true,
  "mode": "JS8",
  "tool": "webftr-js8-sync-probe",
  "tool_version": "step48-source-decoder-path-audit",
  "input_wav": "/decoders/js8_decoder/runtime/selftest_js8_costas_probe.wav",
  "rx_only": true,
  "safety": {
    "tx": false,
    "ptt": false,
    "tune": false,
    "send": false,
    "js8call_runtime_control": false
  },
  "implementation_stage": "step43_sync_candidates_with_ldpc_probe_followup_no_final_decode",
  "wav": {
    "path": "/decoders/js8_decoder/runtime/selftest_js8_costas_probe.wav",
    "channels": 1,
    "sample_rate": 12000,
    "sample_width_bytes": 2,
    "frames": 148608,
    "duration_seconds": 12.384,
    "rms_dbfs": -15.61,
    "peak_dbfs": -12.25,
    "clipped": false
  },
  "js8_reference": {
    "source": "JS8Call-Improved source-map orientation plus FT8-like Costas7 hypothesis",
    "sample_rate_hz": 12000,
    "default_nsps": 6192,
    "default_symbol_duration_seconds": 0.516,
    "costas7_candidate": [
      3,
      1,
      4,
      0,
      6,
      5,
      2
    ],
    "tone_count_candidate": 8,
    "note": "This is a sync/symbol candidate extractor only. It estimates frame/symbol candidates for lab work and does not perform LDPC/FEC decode or JS8 message unpacking."
  },
  "scan": {
    "nsps": 6192,
    "tone_spacing_hz": 1.937984,
    "freq_min_hz": 300.0,
    "freq_max_hz": 3000.0,
    "max_seconds_analyzed": 4.0,
    "start_candidates_scanned": 1,
    "base_candidates_scanned": 1,
    "base_candidates_hz": [
      1000.0
    ],
    "coarse_tone_candidates": [
      {
        "freq_hz": 1000.0,
        "relative_db": 0.0,
        "power": 6.94910418
      },
      {
        "freq_hz": 1025.0,
        "relative_db": -27.24,
        "power": 0.0131166
      },
      {
        "freq_hz": 975.0,
        "relative_db": -27.53,
        "power": 0.01227993
      },
      {
        "freq_hz": 1050.0,
        "relative_db": -37.39,
        "power": 0.0012678
      },
      {
        "freq_hz": 1075.0,
        "relative_db": -41.43,
        "power": 0.00049951
      },
      {
        "freq_hz": 950.0,
        "relative_db": -43.35,
        "power": 0.00032115
      },
      {
        "freq_hz": 1100.0,
        "relative_db": -46.57,
        "power": 0.00015313
      },
      {
        "freq_hz": 1250.0,
        "relative_db": -47.96,
        "power": 0.00011108
      },
      {
        "freq_hz": 1125.0,
        "relative_db": -48.58,
        "power": 9.635e-05
      },
      {
        "freq_hz": 1200.0,
        "relative_db": -50.32,
        "power": 6.457e-05
      },
      {
        "freq_hz": 875.0,
        "relative_db": -50.9,
        "power": 5.646e-05
      },
      {
        "freq_hz": 1175.0,
        "relative_db": -51.46,
        "power": 4.965e-05
      }
    ]
  },
  "sync_candidates": [
    {
      "ok": true,
      "start_sample": 0,
      "start_seconds": 0.0,
      "base_freq_hz": 1000.0,
      "tone_spacing_hz": 1.937984,
      "nsps": 6192,
      "costas_pattern": [
        3,
        1,
        4,
        0,
        6,
        5,
        2
      ],
      "costas_hits": 7,
      "costas_symbols": 7,
      "avg_margin_db": 29.11,
      "energy_score_db": 29.11,
      "candidate_score": 128.22,
      "symbols": [
        {
          "symbol": 0,
          "expected_tone": 3,
          "strongest_tone": 3,
          "expected_is_strongest": true,
          "expected_power": 83.0873099286,
          "median_other_power": 0.1042308968,
          "margin_db": 29.02,
          "tone_powers": [
            0.0981480318,
            0.1051242996,
            0.1064179268,
            83.0873099286,
            0.1057422016,
            0.1042308968,
            0.0993799575,
            0.0932492823
          ]
        },
        {
          "symbol": 1,
          "expected_tone": 1,
          "strongest_tone": 1,
          "expected_is_strongest": true,
          "expected_power": 83.0774568889,
          "median_other_power": 0.1014706768,
          "margin_db": 29.13,
          "tone_powers": [
            0.1068702304,
            83.0774568889,
            0.1052822376,
            0.105564598,
            0.1014706768,
            0.0956100015,
            0.0879534486,
            0.0800992227
          ]
        },
        {
          "symbol": 2,
          "expected_tone": 4,
          "strongest_tone": 4,
          "expected_is_strongest": true,
          "expected_power": 83.0917714671,
          "median_other_power": 0.1044873575,
          "margin_db": 29.0,
          "tone_powers": [
            0.0960127168,
            0.0986802754,
            0.1054058068,
            0.1081981246,
            83.0917714671,
            0.1055965002,
            0.1044873575,
            0.0990928872
          ]
        },
        {
          "symbol": 3,
          "expected_tone": 0,
          "strongest_tone": 0,
          "expected_is_strongest": true,
          "expected_power": 83.0749822549,
          "median_other_power": 0.0948551103,
          "margin_db": 29.42,
          "tone_powers": [
            83.0749822549,
            0.1081775542,
            0.1032741915,
            0.1002757935,
            0.0948551103,
            0.0864721839,
            0.080493759,
            0.0726495994
          ]
        },
        {
          "symbol": 4,
          "expected_tone": 6,
          "strongest_tone": 6,
          "expected_is_strongest": true,
          "expected_power": 83.0368796528,
          "median_other_power": 0.1013897721,
          "margin_db": 29.13,
          "tone_powers": [
            0.0811328494,
            0.088780076,
            0.0950670222,
            0.1013897721,
            0.1027811248,
            0.1070386893,
            83.0368796528,
            0.1089829146
          ]
        },
        {
          "symbol": 5,
          "expected_tone": 5,
          "strongest_tone": 5,
          "expected_is_strongest": true,
          "expected_power": 83.0780861176,
          "median_other_power": 0.1045690469,
          "margin_db": 29.0,
          "tone_powers": [
            0.0865241623,
            0.0949217802,
            0.099666939,
            0.1045690469,
            0.1061057949,
            83.0780861176,
            0.1100149946,
            0.1049352501
          ]
        },
        {
          "symbol": 6,
          "expected_tone": 2,
          "strongest_tone": 2,
          "expected_is_strongest": true,
          "expected_power": 83.0649691812,
          "median_other_power": 0.1027968836,
          "margin_db": 29.07,
          "tone_powers": [
            0.1060939743,
            0.1064017103,
            83.0649691812,
            0.1058247328,
            0.1027968836,
            0.1002472492,
            0.0945580448,
            0.088818472
          ]
        }
      ],
      "symbol_preview": [
        {
          "symbol": 0,
          "tone_index": 3,
          "confidence_db": 28.93,
          "powers": [
            0.0981480318,
            0.1051242996,
            0.1064179268,
            83.0873099286,
            0.1057422016,
            0.1042308968,
            0.0993799575,
            0.0932492823
          ]
        },
        {
          "symbol": 1,
          "tone_index": 1,
          "confidence_db": 28.91,
          "powers": [
            0.1068702304,
            83.0774568889,
            0.1052822376,
            0.105564598,
            0.1014706768,
            0.0956100015,
            0.0879534486,
            0.0800992227
          ]
        },
        {
          "symbol": 2,
          "tone_index": 4,
          "confidence_db": 28.85,
          "powers": [
            0.0960127168,
            0.0986802754,
            0.1054058068,
            0.1081981246,
            83.0917714671,
            0.1055965002,
            0.1044873575,
            0.0990928872
          ]
        },
        {
          "symbol": 3,
          "tone_index": 0,
          "confidence_db": 28.85,
          "powers": [
            83.0749822549,
            0.1081775542,
            0.1032741915,
            0.1002757935,
            0.0948551103,
            0.0864721839,
            0.080493759,
            0.0726495994
          ]
        },
        {
          "symbol": 4,
          "tone_index": 6,
          "confidence_db": 28.82,
          "powers": [
            0.0811328494,
            0.088780076,
            0.0950670222,
            0.1013897721,
            0.1027811248,
            0.1070386893,
            83.0368796528,
            0.1089829146
          ]
        },
        {
          "symbol": 5,
          "tone_index": 5,
          "confidence_db": 28.78,
          "powers": [
            0.0865241623,
            0.0949217802,
            0.099666939,
            0.1045690469,
            0.1061057949,
            83.0780861176,
            0.1100149946,
            0.1049352501
          ]
        },
        {
          "symbol": 6,
          "tone_index": 2,
          "confidence_db": 28.92,
          "powers": [
            0.1060939743,
            0.1064017103,
            83.0649691812,
            0.1058247328,
            0.1027968836,
            0.1002472492,
            0.0945580448,
            0.088818472
          ]
        }
      ]
    }
  ],
  "decodes": [],
  "warnings": [
    "No JS8 text decode is expected in Step 48. Final real LDPC/FEC and Varicode/message unpack are not implemented yet.",
    "Costas7 scoring is a lab candidate extractor; real decoder validation requires actual JS8 WAV samples."
  ],
  "next_action": "Run sync-probe on real JS8 WAV captures. If stable sync_candidates appear, Step 48 can continue soft-symbol metric extraction for the LDPC/FEC path."
}