{
  "ok": true,
  "mode": "JS8",
  "tool": "webftr-js8-fec-candidate-export",
  "tool_version": "step63-source-exact-interleaver-whitening-index-extract",
  "input_wav": "/decoders/js8_decoder/runtime/step83_quick_windows/js8_quick_selected_window.wav",
  "rx_only": true,
  "safety": {
    "tx": false,
    "ptt": false,
    "tune": false,
    "send": false,
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  },
  "implementation_stage": "step43_profile_anchor_candidate_export_no_message_unpack",
  "selected_profile": {
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    "tone_spacing_hz": 2.0,
    "note": "0.500 s timing guard candidate",
    "ok": true,
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      "costas_hits": 2,
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    "frame": {
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      "data_symbol_count_estimate": 58,
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    "fec": {
      "soft_bit_count_estimate": 174,
      "missing_soft_bits_estimate": 0,
      "complete_ldpc_input_candidate_estimate": true
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    "rank_score": 205.266
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  "profile_selection_source": "profile_scan_prefer_js8",
  "profile_scan_json": null,
  "anchor_json": null,
  "anchor_selection": {
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    "path": null,
    "selection": "local_profile_scan_selected_profile",
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    "start_seconds": 0.0,
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  "anchor_attempts": [
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      "source": "candidate_export_local_profile_scan",
      "path": null,
      "selection": "local_profile_scan_selected_profile",
      "nsps": 6000,
      "start_seconds": 0.0,
      "base_freq_hz": 995.0,
      "tone_spacing_hz": 2.0
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  "anchor_expected_enabled": true,
  "prefer_js8_realistic_profile": true,
  "nsps_used": 6000,
  "nsps_is_js8_realistic": true,
  "wav": {
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    "sample_width_bytes": 2,
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  "sync_candidate": {
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    "anchor_source": "candidate_export_local_profile_scan"
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  "frame_candidate": {
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    "detected_costas_blocks": [],
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    "costas_policy": "js8_leading_only"
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    "complete_ldpc_input_candidate": true,
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  "anchor_context": {
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    "tone_spacing_hz": 2.0,
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    "complete_174bit_candidate": true,
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      "name": "reverse_full_bitstream",
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      "llr_stats": {
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      "rank_score": 106.342808
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      "llr_count": 174,
      "complete_174bit_candidate": true,
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      "llr_stats": {
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      "rank_score": 106.342808
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    {
      "name": "lab_mask_xor_preview",
      "description": "Deterministic lab-only XOR mask preview; not the real JS8 whitening polynomial.",
      "bit_count": 174,
      "llr_count": 174,
      "complete_174bit_candidate": true,
      "hard_bits_174": "100000110011100011100010111111100111110100110110011010000101011101000000010111110011001010111100010110000110100110010011100010111110011101000100000100011000000011110011011011",
      "hard_bits_sha256_16": "fdbdf99c400d8fc3",
      "hard_weight_174": 86,
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      "llr_stats": {
        "count": 174,
        "avg_abs": 2.255602,
        "min_abs": 0.004984,
        "max_abs": 4.251272,
        "positive": 90,
        "negative": 84,
        "zero": 0
      },
      "rank_score": 101.022408
    }
  ],
  "outputs": {
    "candidate_json": "/decoders/js8_decoder/runtime/step83_fec_candidates/js8_quick_selected_window_fec_candidate_step17.json",
    "selected_bits_file": "/decoders/js8_decoder/runtime/step83_fec_candidates/js8_quick_selected_window_fec_candidate_step17.bits"
  },
  "decodes": [],
  "warnings": [
    "Step 54 JS8 Costas guard uses leading-only Costas exclusion by default to preserve 58 data symbols / 174 soft bits on JS8Lab windows; full FT8 middle/trailing exclusion remains diagnostic-only.",
    "Step 54 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.",
    "Step 54 prepares LDPC/FEC input candidates and an LDPC probe harness only; it does not yet run final real JS8 LDPC decode or unpack text.",
    "Step 54 does not decode JS8 text yet. It probes FT8-style Gray de-mapping, bit order and 174-bit interleaver candidates for real LDPC/FEC integration.",
    "lab_mask_xor_preview is only a repeatable diagnostic mask, not a confirmed JS8 whitening implementation.",
    "Step 54 locks candidate export to JS8-realistic timing and reuses the selected profile sync anchor for FEC symbol extraction where available.",
    "It still does not perform real LDPC/FEC decode or message unpack.",
    "Next step can tune real JS8/FT8 LDPC matrix/deinterleaver/message unpack against this anchored candidate contract."
  ],
  "next_action": "Run collect-logs and upload the JS8Lab bundle. If selected_variant.complete_174bit_candidate is true, proceed to LDPC/deinterleaver/message-unpack tuning."
}