{ "ok": true, "mode": "JS8", "tool": "webftr-js8-timing-boundary-candidate-sweep", "tool_version": "step37-timing-best-candidate-softdecode", "input_wav": "/decoders/js8_decoder/runtime/quick_prefilter_windows/js8_quick_selected_window.wav", "profile_scan_json": "/decoders/js8_decoder/logs/20260527T035634Z_real_run_profile_scan_output.json", "anchor_json": "/decoders/js8_decoder/logs/20260527T035634Z_real_run_auto_ldpc_probe_output.json", "rx_only": true, "safety": { "tx": false, "ptt": false, "tune": false, "send": false, "js8call_runtime_control": false }, "implementation_stage": "step37_timing_boundary_syndrome_sweep_no_message_unpack", "anchor_selection": { "source": "profile_scan_json", "path": "/decoders/js8_decoder/logs/20260527T035634Z_real_run_profile_scan_output.json", "selection": "profile_scan_selected_profile", "nsps": 6400, "start_seconds": 4.8, "base_freq_hz": 1025.0, "tone_spacing_hz": 1.875 }, "sweep_grid": { "start_offsets_s": [ 0.24, 0.36, 0.48, 0.6, 0.72, 0.84 ], "base_freq_offsets_hz": [ 2.0, 3.0, 4.0, 5.0, 6.0 ], "tone_spacing_offsets_hz": [ 0.0 ], "max_combinations": 30, "actual_combinations": 30 }, "decode_found": false, "best_final_syndrome_weight": 24, "best_candidate": { "combination_index": 3, "offsets": { "start_offset_s": 0.24, "base_freq_offset_hz": 4.0, "tone_spacing_offset_hz": 0.0 }, "anchor_applied": { "start_seconds": 5.04, "base_freq_hz": 1029.0, "tone_spacing_hz": 1.875, "nsps": 6400 }, "pipeline_ok": true, "fec_input_summary": { "soft_bit_count": 174, "missing_soft_bits": 0, "complete_ldpc_input_candidate": true, "llr_convention": "positive=bit0_more_likely, negative=bit1_more_likely, MSB-first candidate" }, "sync_candidate": { "start_sample": 60480, "start_seconds": 5.04, "base_freq_hz": 1029.0, "tone_spacing_hz": 1.875, "nsps": 6400, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step37_timing_boundary_sweep:3" }, "best_row": { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+no_interleaver", "transform": "lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 32, "llr_stats": { "count": 174, "avg_abs": 1.783717, "min_abs": 0.004438, "max_abs": 4.061714, "positive": 144, "negative": 30, "zero": 0 }, "source_rank_score": 107.134868, "syndrome_weight": 24, "valid_codeword_hard_decision": false, "message91_sha256_16": "400988287db337c2", "codeword174_sha256_16": "e737ddc1f2cfd29b" }, "top_rows": [ { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+no_interleaver", "transform": "lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 32, "llr_stats": { "count": 174, "avg_abs": 1.783717, "min_abs": 0.004438, "max_abs": 4.061714, "positive": 144, "negative": 30, "zero": 0 }, "source_rank_score": 107.134868, "syndrome_weight": 24, "valid_codeword_hard_decision": false, "message91_sha256_16": "400988287db337c2", "codeword174_sha256_16": "e737ddc1f2cfd29b" }, { "variant": "mapped_ft8_gray_primary_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 60, "llr_stats": { "count": 174, "avg_abs": 1.045493, "min_abs": 0.001144, "max_abs": 3.190566, "positive": 117, "negative": 57, "zero": 0 }, "source_rank_score": 104.181972, "syndrome_weight": 28, "valid_codeword_hard_decision": false, "message91_sha256_16": "b419e71920db3585", "codeword174_sha256_16": "8bccbb10bbbf4d88" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 34, "llr_stats": { "count": 174, "avg_abs": 1.814251, "min_abs": 0.001652, "max_abs": 4.061714, "positive": 144, "negative": 30, "zero": 0 }, "source_rank_score": 107.257004, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "94f535c19abe8e97", "codeword174_sha256_16": "e050196dd1284fb0" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+no_interleaver", "transform": "ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 50, "llr_stats": { "count": 174, "avg_abs": 1.080621, "min_abs": 2.6e-05, "max_abs": 3.170302, "positive": 126, "negative": 48, "zero": 0 }, "source_rank_score": 104.322484, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "ef548b254868b745", "codeword174_sha256_16": "3d5161b1e316b16f" }, { "variant": "lab_mask_xor_preview", "transform": "raw_msb+no_interleaver", "mapping_meta": { "tone_mapping": "raw_msb", "interleaver": "none" }, "bit_count": 174, "hard_weight_174": 90, "llr_stats": { "count": 174, "avg_abs": 2.187161, "min_abs": 0.036806, "max_abs": 4.061714, "positive": 136, "negative": 38, "zero": 0 }, "source_rank_score": 100.748644, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "2d887c7972af6374", "codeword174_sha256_16": "e3a96fe6ad757407" }, { "variant": "mapped_lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "ft8_gray_primary_demap_msb_input+no_interleaver+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "none", "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 119, "llr_stats": { "count": 174, "avg_abs": 1.645352, "min_abs": 0.003492, "max_abs": 3.929378, "positive": 51, "negative": 123, "zero": 0 }, "source_rank_score": 106.581408, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "ad56c1db43052c18", "codeword174_sha256_16": "16aeb541b9fcee47" }, { "variant": "mapped_lsb_within_each_tone+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "ft8_gray_alt_high_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 53, "llr_stats": { "count": 174, "avg_abs": 1.635183, "min_abs": 0.01965, "max_abs": 4.061714, "positive": 123, "negative": 51, "zero": 0 }, "source_rank_score": 106.540732, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "6a8d5bcbf434d857", "codeword174_sha256_16": "e5ec524c8f7f0cb9" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+no_interleaver", "transform": "ft8_gray_primary_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 133, "llr_stats": { "count": 174, "avg_abs": 1.606337, "min_abs": 0.004599, "max_abs": 4.061714, "positive": 35, "negative": 139, "zero": 0 }, "source_rank_score": 106.425348, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "9c5c8e131830f6a9", "codeword174_sha256_16": "a799925e0e4517b4" } ], "warnings": [ "Step 37 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 37 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 37 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 37 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." ] }, "top_candidates": [ { "combination_index": 3, "offsets": { "start_offset_s": 0.24, "base_freq_offset_hz": 4.0, "tone_spacing_offset_hz": 0.0 }, "anchor_applied": { "start_seconds": 5.04, "base_freq_hz": 1029.0, "tone_spacing_hz": 1.875, "nsps": 6400 }, "pipeline_ok": true, "fec_input_summary": { "soft_bit_count": 174, "missing_soft_bits": 0, "complete_ldpc_input_candidate": true, "llr_convention": "positive=bit0_more_likely, negative=bit1_more_likely, MSB-first candidate" }, "sync_candidate": { "start_sample": 60480, "start_seconds": 5.04, "base_freq_hz": 1029.0, "tone_spacing_hz": 1.875, "nsps": 6400, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step37_timing_boundary_sweep:3" }, "best_row": { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+no_interleaver", "transform": "lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 32, "llr_stats": { "count": 174, "avg_abs": 1.783717, "min_abs": 0.004438, "max_abs": 4.061714, "positive": 144, "negative": 30, "zero": 0 }, "source_rank_score": 107.134868, "syndrome_weight": 24, "valid_codeword_hard_decision": false, "message91_sha256_16": "400988287db337c2", "codeword174_sha256_16": "e737ddc1f2cfd29b" }, "top_rows": [ { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+no_interleaver", "transform": "lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 32, "llr_stats": { "count": 174, "avg_abs": 1.783717, "min_abs": 0.004438, "max_abs": 4.061714, "positive": 144, "negative": 30, "zero": 0 }, "source_rank_score": 107.134868, "syndrome_weight": 24, "valid_codeword_hard_decision": false, "message91_sha256_16": "400988287db337c2", "codeword174_sha256_16": "e737ddc1f2cfd29b" }, { "variant": "mapped_ft8_gray_primary_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 60, "llr_stats": { "count": 174, "avg_abs": 1.045493, "min_abs": 0.001144, "max_abs": 3.190566, "positive": 117, "negative": 57, "zero": 0 }, "source_rank_score": 104.181972, "syndrome_weight": 28, "valid_codeword_hard_decision": false, "message91_sha256_16": "b419e71920db3585", "codeword174_sha256_16": "8bccbb10bbbf4d88" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 34, "llr_stats": { "count": 174, "avg_abs": 1.814251, "min_abs": 0.001652, "max_abs": 4.061714, "positive": 144, "negative": 30, "zero": 0 }, "source_rank_score": 107.257004, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "94f535c19abe8e97", "codeword174_sha256_16": "e050196dd1284fb0" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+no_interleaver", "transform": "ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 50, "llr_stats": { "count": 174, "avg_abs": 1.080621, "min_abs": 2.6e-05, "max_abs": 3.170302, "positive": 126, "negative": 48, "zero": 0 }, "source_rank_score": 104.322484, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "ef548b254868b745", "codeword174_sha256_16": "3d5161b1e316b16f" }, { "variant": "lab_mask_xor_preview", "transform": "raw_msb+no_interleaver", "mapping_meta": { "tone_mapping": "raw_msb", "interleaver": "none" }, "bit_count": 174, "hard_weight_174": 90, "llr_stats": { "count": 174, "avg_abs": 2.187161, "min_abs": 0.036806, "max_abs": 4.061714, "positive": 136, "negative": 38, "zero": 0 }, "source_rank_score": 100.748644, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "2d887c7972af6374", "codeword174_sha256_16": "e3a96fe6ad757407" }, { "variant": "mapped_lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "ft8_gray_primary_demap_msb_input+no_interleaver+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "none", "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 119, "llr_stats": { "count": 174, "avg_abs": 1.645352, "min_abs": 0.003492, "max_abs": 3.929378, "positive": 51, "negative": 123, "zero": 0 }, "source_rank_score": 106.581408, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "ad56c1db43052c18", "codeword174_sha256_16": "16aeb541b9fcee47" }, { "variant": "mapped_lsb_within_each_tone+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "ft8_gray_alt_high_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 53, "llr_stats": { "count": 174, "avg_abs": 1.635183, "min_abs": 0.01965, "max_abs": 4.061714, "positive": 123, "negative": 51, "zero": 0 }, "source_rank_score": 106.540732, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "6a8d5bcbf434d857", "codeword174_sha256_16": "e5ec524c8f7f0cb9" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+no_interleaver", "transform": "ft8_gray_primary_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 133, "llr_stats": { "count": 174, "avg_abs": 1.606337, "min_abs": 0.004599, "max_abs": 4.061714, "positive": 35, "negative": 139, "zero": 0 }, "source_rank_score": 106.425348, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "9c5c8e131830f6a9", "codeword174_sha256_16": "a799925e0e4517b4" } ], "warnings": [ "Step 37 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 37 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 37 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 37 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." ] }, { "combination_index": 6, "offsets": { "start_offset_s": 0.36, "base_freq_offset_hz": 2.0, "tone_spacing_offset_hz": 0.0 }, "anchor_applied": { "start_seconds": 5.16, "base_freq_hz": 1027.0, "tone_spacing_hz": 1.875, "nsps": 6400 }, "pipeline_ok": true, "fec_input_summary": { "soft_bit_count": 174, "missing_soft_bits": 0, "complete_ldpc_input_candidate": true, "llr_convention": "positive=bit0_more_likely, negative=bit1_more_likely, MSB-first candidate" }, "sync_candidate": { "start_sample": 61920, "start_seconds": 5.16, "base_freq_hz": 1027.0, "tone_spacing_hz": 1.875, "nsps": 6400, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step37_timing_boundary_sweep:6" }, "best_row": { "variant": "mapped_ft8_gray_primary_demap_msb_input+no_interleaver", "transform": "lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 33, "llr_stats": { "count": 174, "avg_abs": 2.014762, "min_abs": 0.107688, "max_abs": 4.123238, "positive": 140, "negative": 34, "zero": 0 }, "source_rank_score": 108.059048, "syndrome_weight": 25, "valid_codeword_hard_decision": false, "message91_sha256_16": "b77562fbffe40746", "codeword174_sha256_16": "52671d4b53d0963f" }, "top_rows": [ { "variant": "mapped_ft8_gray_primary_demap_msb_input+no_interleaver", "transform": "lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 33, "llr_stats": { "count": 174, "avg_abs": 2.014762, "min_abs": 0.107688, "max_abs": 4.123238, "positive": 140, "negative": 34, "zero": 0 }, "source_rank_score": 108.059048, "syndrome_weight": 25, "valid_codeword_hard_decision": false, "message91_sha256_16": "b77562fbffe40746", "codeword174_sha256_16": "52671d4b53d0963f" }, { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+no_interleaver", "transform": "lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 33, "llr_stats": { "count": 174, "avg_abs": 1.963551, "min_abs": 0.013238, "max_abs": 4.123238, "positive": 140, "negative": 34, "zero": 0 }, "source_rank_score": 107.854204, "syndrome_weight": 25, "valid_codeword_hard_decision": false, "message91_sha256_16": "b77562fbffe40746", "codeword174_sha256_16": "52671d4b53d0963f" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "ft8_gray_primary_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 40, "llr_stats": { "count": 174, "avg_abs": 1.514423, "min_abs": 0.000556, "max_abs": 4.039481, "positive": 135, "negative": 39, "zero": 0 }, "source_rank_score": 106.057692, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "a4df3b03aa7ea8e7", "codeword174_sha256_16": "731f43802ba966c2" }, { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "ft8_gray_primary_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 40, "llr_stats": { "count": 174, "avg_abs": 1.476366, "min_abs": 0.009537, "max_abs": 4.039481, "positive": 134, "negative": 40, "zero": 0 }, "source_rank_score": 105.905464, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "a4df3b03aa7ea8e7", "codeword174_sha256_16": "731f43802ba966c2" }, { "variant": "reverse_symbol_order", "transform": "ft8_gray_primary_demap_msb_input+no_interleaver+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "none", "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 141, "llr_stats": { "count": 174, "avg_abs": 1.861558, "min_abs": 0.094608, "max_abs": 4.061809, "positive": 42, "negative": 132, "zero": 0 }, "source_rank_score": 111.446232, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "62bb3605b9d593cd", "codeword174_sha256_16": "2fa0886d87167654" }, { "variant": "reverse_symbol_order", "transform": "ft8_gray_alt_high_demap_msb_input+no_interleaver+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "none", "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 141, "llr_stats": { "count": 174, "avg_abs": 1.810348, "min_abs": 0.013238, "max_abs": 4.046739, "positive": 42, "negative": 132, "zero": 0 }, "source_rank_score": 111.241392, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "62bb3605b9d593cd", "codeword174_sha256_16": "2fa0886d87167654" }, { "variant": "reverse_full_bitstream", "transform": "ft8_gray_primary_demap_lsb_input+no_interleaver+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "none", "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 141, "llr_stats": { "count": 174, "avg_abs": 2.014762, "min_abs": 0.107688, "max_abs": 4.123238, "positive": 34, "negative": 140, "zero": 0 }, "source_rank_score": 111.059048, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "62bb3605b9d593cd", "codeword174_sha256_16": "2fa0886d87167654" }, { "variant": "reverse_full_bitstream", "transform": "ft8_gray_alt_high_demap_lsb_input+no_interleaver+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "none", "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 141, "llr_stats": { "count": 174, "avg_abs": 1.963551, "min_abs": 0.013238, "max_abs": 4.123238, "positive": 34, "negative": 140, "zero": 0 }, "source_rank_score": 110.854204, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "62bb3605b9d593cd", "codeword174_sha256_16": "2fa0886d87167654" } ], "warnings": [ "Step 37 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 37 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 37 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 37 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." ] }, { "combination_index": 13, "offsets": { "start_offset_s": 0.48, "base_freq_offset_hz": 4.0, "tone_spacing_offset_hz": 0.0 }, "anchor_applied": { "start_seconds": 5.279999999999999, "base_freq_hz": 1029.0, "tone_spacing_hz": 1.875, "nsps": 6400 }, "pipeline_ok": true, "fec_input_summary": { "soft_bit_count": 174, "missing_soft_bits": 0, "complete_ldpc_input_candidate": true, "llr_convention": "positive=bit0_more_likely, negative=bit1_more_likely, MSB-first candidate" }, "sync_candidate": { "start_sample": 63360, "start_seconds": 5.28, "base_freq_hz": 1029.0, "tone_spacing_hz": 1.875, "nsps": 6400, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step37_timing_boundary_sweep:13" }, "best_row": { "variant": "raw_msb_symbol_order", "transform": "ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 130, "llr_stats": { "count": 174, "avg_abs": 1.337379, "min_abs": 0.001091, "max_abs": 3.985843, "positive": 35, "negative": 139, "zero": 0 }, "source_rank_score": 123.349516, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "6b9d3da0c42ad063", "codeword174_sha256_16": "155181154e8e8431" }, "top_rows": [ { "variant": "raw_msb_symbol_order", "transform": "ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 130, "llr_stats": { "count": 174, "avg_abs": 1.337379, "min_abs": 0.001091, "max_abs": 3.985843, "positive": 35, "negative": 139, "zero": 0 }, "source_rank_score": 123.349516, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "6b9d3da0c42ad063", "codeword174_sha256_16": "155181154e8e8431" }, { "variant": "lsb_within_each_tone", "transform": "ft8_gray_alt_high_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 130, "llr_stats": { "count": 174, "avg_abs": 1.643299, "min_abs": 0.001091, "max_abs": 4.355766, "positive": 24, "negative": 150, "zero": 0 }, "source_rank_score": 116.573196, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "6b9d3da0c42ad063", "codeword174_sha256_16": "155181154e8e8431" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "raw_msb+no_interleaver+inverted_bits", "mapping_meta": { "tone_mapping": "raw_msb", "interleaver": "none", "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 130, "llr_stats": { "count": 174, "avg_abs": 1.337379, "min_abs": 0.001091, "max_abs": 3.985843, "positive": 35, "negative": 139, "zero": 0 }, "source_rank_score": 105.349516, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "6b9d3da0c42ad063", "codeword174_sha256_16": "155181154e8e8431" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+no_interleaver", "transform": "raw_msb+ft8_bitrev_interleave_codeword_to_rx_inverse+inverted_bits", "mapping_meta": { "tone_mapping": "raw_msb", "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 130, "llr_stats": { "count": 174, "avg_abs": 1.337379, "min_abs": 0.001091, "max_abs": 3.985843, "positive": 35, "negative": 139, "zero": 0 }, "source_rank_score": 105.349516, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "6b9d3da0c42ad063", "codeword174_sha256_16": "155181154e8e8431" }, { "variant": "mapped_lsb_within_each_tone+no_interleaver", "transform": "ft8_gray_alt_high_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 130, "llr_stats": { "count": 174, "avg_abs": 1.337379, "min_abs": 0.001091, "max_abs": 3.985843, "positive": 35, "negative": 139, "zero": 0 }, "source_rank_score": 105.349516, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "6b9d3da0c42ad063", "codeword174_sha256_16": "155181154e8e8431" }, { "variant": "mapped_raw_msb+no_interleaver", "transform": "ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 130, "llr_stats": { "count": 174, "avg_abs": 1.337379, "min_abs": 0.001091, "max_abs": 3.985843, "positive": 35, "negative": 139, "zero": 0 }, "source_rank_score": 105.349516, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "6b9d3da0c42ad063", "codeword174_sha256_16": "155181154e8e8431" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "ft8_gray_primary_demap_msb_input+no_interleaver", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "none" }, "bit_count": 174, "hard_weight_174": 43, "llr_stats": { "count": 174, "avg_abs": 1.215547, "min_abs": 0.001496, "max_abs": 3.843423, "positive": 135, "negative": 39, "zero": 0 }, "source_rank_score": 104.862188, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "bf02d9f7f0faffc7", "codeword174_sha256_16": "72b3f8a61ed635bd" }, { "variant": "mapped_lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "raw_msb+ft8_bitrev_interleave_codeword_to_rx_inverse+inverted_bits", "mapping_meta": { "tone_mapping": "raw_msb", "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 144, "llr_stats": { "count": 174, "avg_abs": 1.982319, "min_abs": 0.028012, "max_abs": 4.355766, "positive": 28, "negative": 146, "zero": 0 }, "source_rank_score": 107.929276, "syndrome_weight": 28, "valid_codeword_hard_decision": false, "message91_sha256_16": "9b90b2ba76e1e6df", "codeword174_sha256_16": "49224bf9726aa67c" } ], "warnings": [ "Step 37 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 37 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 37 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 37 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." ] }, { "combination_index": 27, "offsets": { "start_offset_s": 0.84, "base_freq_offset_hz": 3.0, "tone_spacing_offset_hz": 0.0 }, "anchor_applied": { "start_seconds": 5.64, "base_freq_hz": 1028.0, "tone_spacing_hz": 1.875, "nsps": 6400 }, "pipeline_ok": true, "fec_input_summary": { "soft_bit_count": 174, "missing_soft_bits": 0, "complete_ldpc_input_candidate": true, "llr_convention": "positive=bit0_more_likely, negative=bit1_more_likely, MSB-first candidate" }, "sync_candidate": { "start_sample": 67680, "start_seconds": 5.64, "base_freq_hz": 1028.0, "tone_spacing_hz": 1.875, "nsps": 6400, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step37_timing_boundary_sweep:27" }, "best_row": { "variant": "mapped_ft8_gray_primary_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 52, "llr_stats": { "count": 174, "avg_abs": 1.74199, "min_abs": 0.019203, "max_abs": 4.093505, "positive": 125, "negative": 49, "zero": 0 }, "source_rank_score": 106.96796, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "e18e3ca8448db477", "codeword174_sha256_16": "77bf49e19e3af101" }, "top_rows": [ { "variant": "mapped_ft8_gray_primary_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 52, "llr_stats": { "count": 174, "avg_abs": 1.74199, "min_abs": 0.019203, "max_abs": 4.093505, "positive": 125, "negative": 49, "zero": 0 }, "source_rank_score": 106.96796, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "e18e3ca8448db477", "codeword174_sha256_16": "77bf49e19e3af101" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 54, "llr_stats": { "count": 174, "avg_abs": 1.689704, "min_abs": 0.000968, "max_abs": 4.093505, "positive": 119, "negative": 55, "zero": 0 }, "source_rank_score": 106.758816, "syndrome_weight": 28, "valid_codeword_hard_decision": false, "message91_sha256_16": "e18e3ca8448db477", "codeword174_sha256_16": "4da6436e9fd7eefb" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "ft8_gray_primary_demap_lsb_input+no_interleaver+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "none", "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 114, "llr_stats": { "count": 174, "avg_abs": 1.159102, "min_abs": 0.000968, "max_abs": 4.06647, "positive": 61, "negative": 113, "zero": 0 }, "source_rank_score": 104.636408, "syndrome_weight": 28, "valid_codeword_hard_decision": false, "message91_sha256_16": "261372a8692ebab6", "codeword174_sha256_16": "8fe43878b0c78364" }, { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "lsb_within_each_tone+ft8_bitrev_deinterleave_rx_to_codeword", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 33, "llr_stats": { "count": 174, "avg_abs": 1.859562, "min_abs": 0.000968, "max_abs": 3.942365, "positive": 140, "negative": 34, "zero": 0 }, "source_rank_score": 107.438248, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "6a3e0dde96128128", "codeword174_sha256_16": "195e9e5557198399" }, { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+no_interleaver", "transform": "lsb_within_each_tone+ft8_bitrev_deinterleave_rx_to_codeword+inverted_bits", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 141, "llr_stats": { "count": 174, "avg_abs": 1.859561, "min_abs": 0.000968, "max_abs": 3.942365, "positive": 34, "negative": 140, "zero": 0 }, "source_rank_score": 107.438244, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "ad9dabf0d729237f", "codeword174_sha256_16": "0a6a283e2f5a6c55" }, { "variant": "mapped_raw_msb+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "ft8_gray_alt_high_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 47, "llr_stats": { "count": 174, "avg_abs": 1.646495, "min_abs": 0.007705, "max_abs": 4.093505, "positive": 124, "negative": 50, "zero": 0 }, "source_rank_score": 106.58598, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "c650027902edfed2", "codeword174_sha256_16": "70428a6b66c2170b" }, { "variant": "mapped_raw_msb+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "lsb_within_each_tone+no_interleaver", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "none" }, "bit_count": 174, "hard_weight_174": 30, "llr_stats": { "count": 174, "avg_abs": 2.272637, "min_abs": 0.01281, "max_abs": 4.093505, "positive": 142, "negative": 32, "zero": 0 }, "source_rank_score": 109.090548, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "86a83de50fbfd87d", "codeword174_sha256_16": "a5a957cd80c670ef" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "ft8_gray_primary_demap_msb_input+no_interleaver", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "none" }, "bit_count": 174, "hard_weight_174": 60, "llr_stats": { "count": 174, "avg_abs": 1.25004, "min_abs": 0.002028, "max_abs": 3.818918, "positive": 114, "negative": 60, "zero": 0 }, "source_rank_score": 105.00016, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "10a16fa04b89b6d8", "codeword174_sha256_16": "463b6b9598020284" } ], "warnings": [ "Step 37 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 37 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 37 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 37 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." ] }, { "combination_index": 21, "offsets": { "start_offset_s": 0.72, "base_freq_offset_hz": 2.0, "tone_spacing_offset_hz": 0.0 }, "anchor_applied": { "start_seconds": 5.52, "base_freq_hz": 1027.0, "tone_spacing_hz": 1.875, "nsps": 6400 }, "pipeline_ok": true, "fec_input_summary": { "soft_bit_count": 174, "missing_soft_bits": 0, "complete_ldpc_input_candidate": true, "llr_convention": "positive=bit0_more_likely, negative=bit1_more_likely, MSB-first candidate" }, "sync_candidate": { "start_sample": 66240, "start_seconds": 5.52, "base_freq_hz": 1027.0, "tone_spacing_hz": 1.875, "nsps": 6400, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step37_timing_boundary_sweep:21" }, "best_row": { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+no_interleaver", "transform": "ft8_gray_alt_high_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 36, "llr_stats": { "count": 174, "avg_abs": 1.595615, "min_abs": 2e-06, "max_abs": 4.132977, "positive": 139, "negative": 35, "zero": 0 }, "source_rank_score": 106.38246, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "b56247f5d839233c", "codeword174_sha256_16": "1b1188bd5d65df53" }, "top_rows": [ { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+no_interleaver", "transform": "ft8_gray_alt_high_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 36, "llr_stats": { "count": 174, "avg_abs": 1.595615, "min_abs": 2e-06, "max_abs": 4.132977, "positive": 139, "negative": 35, "zero": 0 }, "source_rank_score": 106.38246, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "b56247f5d839233c", "codeword174_sha256_16": "1b1188bd5d65df53" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+no_interleaver", "transform": "ft8_gray_primary_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 37, "llr_stats": { "count": 174, "avg_abs": 1.703806, "min_abs": 0.00085, "max_abs": 4.132977, "positive": 141, "negative": 33, "zero": 0 }, "source_rank_score": 106.815224, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "b56247f5d839233c", "codeword174_sha256_16": "952e982908166032" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+no_interleaver", "transform": "ft8_gray_alt_high_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 37, "llr_stats": { "count": 174, "avg_abs": 1.644979, "min_abs": 0.000412, "max_abs": 4.132977, "positive": 143, "negative": 31, "zero": 0 }, "source_rank_score": 106.579916, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "b56247f5d839233c", "codeword174_sha256_16": "952e982908166032" }, { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+no_interleaver", "transform": "ft8_gray_primary_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 38, "llr_stats": { "count": 174, "avg_abs": 1.628012, "min_abs": 0.001176, "max_abs": 4.132977, "positive": 140, "negative": 34, "zero": 0 }, "source_rank_score": 106.512048, "syndrome_weight": 28, "valid_codeword_hard_decision": false, "message91_sha256_16": "b56247f5d839233c", "codeword174_sha256_16": "4b6a471e3213accb" }, { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+no_interleaver", "transform": "ft8_gray_primary_demap_lsb_input+no_interleaver+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "none", "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 111, "llr_stats": { "count": 174, "avg_abs": 1.25811, "min_abs": 0.001176, "max_abs": 3.154569, "positive": 60, "negative": 114, "zero": 0 }, "source_rank_score": 105.03244, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "fc0187310f0afe33", "codeword174_sha256_16": "d0ccd1bf812200b9" }, { "variant": "mapped_raw_msb+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "ft8_gray_primary_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 126, "llr_stats": { "count": 174, "avg_abs": 1.721357, "min_abs": 0.003171, "max_abs": 4.132977, "positive": 47, "negative": 127, "zero": 0 }, "source_rank_score": 106.885428, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "668bc0fbffbad57a", "codeword174_sha256_16": "42592b229a8b3b87" }, { "variant": "mapped_ft8_gray_primary_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "ft8_gray_primary_demap_msb_input+no_interleaver", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "none" }, "bit_count": 174, "hard_weight_174": 66, "llr_stats": { "count": 174, "avg_abs": 1.215703, "min_abs": 0.001225, "max_abs": 3.717259, "positive": 112, "negative": 62, "zero": 0 }, "source_rank_score": 104.862812, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "5c18868bcb455c8d", "codeword174_sha256_16": "1af6f5ae7d396f13" }, { "variant": "mapped_ft8_gray_primary_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "ft8_gray_alt_high_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 104, "llr_stats": { "count": 174, "avg_abs": 1.117768, "min_abs": 0.006264, "max_abs": 3.717259, "positive": 65, "negative": 109, "zero": 0 }, "source_rank_score": 104.471072, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "0abcf67785d0c092", "codeword174_sha256_16": "31220aa3360cf1d6" } ], "warnings": [ "Step 37 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 37 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 37 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 37 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." ] }, { "combination_index": 12, "offsets": { "start_offset_s": 0.48, "base_freq_offset_hz": 3.0, "tone_spacing_offset_hz": 0.0 }, "anchor_applied": { "start_seconds": 5.279999999999999, "base_freq_hz": 1028.0, "tone_spacing_hz": 1.875, "nsps": 6400 }, "pipeline_ok": true, "fec_input_summary": { "soft_bit_count": 174, "missing_soft_bits": 0, "complete_ldpc_input_candidate": true, "llr_convention": "positive=bit0_more_likely, negative=bit1_more_likely, MSB-first candidate" }, "sync_candidate": { "start_sample": 63360, "start_seconds": 5.28, "base_freq_hz": 1028.0, "tone_spacing_hz": 1.875, "nsps": 6400, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step37_timing_boundary_sweep:12" }, "best_row": { "variant": "mapped_ft8_gray_primary_demap_lsb_input+no_interleaver", "transform": "ft8_gray_alt_high_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 40, "llr_stats": { "count": 174, "avg_abs": 1.204412, "min_abs": 0.000227, "max_abs": 3.767671, "positive": 137, "negative": 37, "zero": 0 }, "source_rank_score": 104.817648, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "2e5d22cbd1cd718a", "codeword174_sha256_16": "f874967d98fa427f" }, "top_rows": [ { "variant": "mapped_ft8_gray_primary_demap_lsb_input+no_interleaver", "transform": "ft8_gray_alt_high_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 40, "llr_stats": { "count": 174, "avg_abs": 1.204412, "min_abs": 0.000227, "max_abs": 3.767671, "positive": 137, "negative": 37, "zero": 0 }, "source_rank_score": 104.817648, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "2e5d22cbd1cd718a", "codeword174_sha256_16": "f874967d98fa427f" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+no_interleaver", "transform": "ft8_gray_alt_high_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 41, "llr_stats": { "count": 174, "avg_abs": 1.196453, "min_abs": 2e-06, "max_abs": 3.767671, "positive": 137, "negative": 37, "zero": 0 }, "source_rank_score": 104.785812, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "2e5d22cbd1cd718a", "codeword174_sha256_16": "5c793302e646ee17" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "raw_msb+ft8_bitrev_interleave_codeword_to_rx_inverse+inverted_bits", "mapping_meta": { "tone_mapping": "raw_msb", "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 132, "llr_stats": { "count": 174, "avg_abs": 1.594482, "min_abs": 0.000324, "max_abs": 3.767671, "positive": 39, "negative": 135, "zero": 0 }, "source_rank_score": 106.377928, "syndrome_weight": 28, "valid_codeword_hard_decision": false, "message91_sha256_16": "21f8a0f7fa749a28", "codeword174_sha256_16": "207b9da8d3d55952" }, { "variant": "reverse_symbol_order", "transform": "ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 42, "llr_stats": { "count": 174, "avg_abs": 1.8392, "min_abs": 0.000324, "max_abs": 4.150246, "positive": 144, "negative": 30, "zero": 0 }, "source_rank_score": 111.3568, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "3a1d11c20f26a49e", "codeword174_sha256_16": "73db19d93367172c" }, { "variant": "reverse_full_bitstream", "transform": "ft8_gray_alt_high_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 42, "llr_stats": { "count": 174, "avg_abs": 1.594482, "min_abs": 0.000324, "max_abs": 3.767671, "positive": 135, "negative": 39, "zero": 0 }, "source_rank_score": 109.377928, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "3a1d11c20f26a49e", "codeword174_sha256_16": "73db19d93367172c" }, { "variant": "mapped_lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "lsb_within_each_tone+ft8_bitrev_deinterleave_rx_to_codeword", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 27, "llr_stats": { "count": 174, "avg_abs": 2.220369, "min_abs": 0.009342, "max_abs": 4.150246, "positive": 149, "negative": 25, "zero": 0 }, "source_rank_score": 108.881476, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "09546fc886e5ffaf", "codeword174_sha256_16": "0c84883d8ca3f350" }, { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "ft8_gray_alt_high_demap_lsb_input+no_interleaver", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "none" }, "bit_count": 174, "hard_weight_174": 49, "llr_stats": { "count": 174, "avg_abs": 1.175159, "min_abs": 0.000215, "max_abs": 3.993971, "positive": 128, "negative": 46, "zero": 0 }, "source_rank_score": 104.700636, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "086db735521feb5b", "codeword174_sha256_16": "9f1aa5f2aa243355" }, { "variant": "mapped_lsb_within_each_tone+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "ft8_gray_primary_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 36, "llr_stats": { "count": 174, "avg_abs": 1.714649, "min_abs": 0.015184, "max_abs": 3.875722, "positive": 144, "negative": 30, "zero": 0 }, "source_rank_score": 106.858596, "syndrome_weight": 32, "valid_codeword_hard_decision": false, "message91_sha256_16": "52a6293e44720dde", "codeword174_sha256_16": "951c2bf0d6a702b6" } ], "warnings": [ "Step 37 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 37 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 37 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 37 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." ] }, { "combination_index": 10, "offsets": { "start_offset_s": 0.36, "base_freq_offset_hz": 6.0, "tone_spacing_offset_hz": 0.0 }, "anchor_applied": { "start_seconds": 5.16, "base_freq_hz": 1031.0, "tone_spacing_hz": 1.875, "nsps": 6400 }, "pipeline_ok": true, "fec_input_summary": { "soft_bit_count": 174, "missing_soft_bits": 0, "complete_ldpc_input_candidate": true, "llr_convention": "positive=bit0_more_likely, negative=bit1_more_likely, MSB-first candidate" }, "sync_candidate": { "start_sample": 61920, "start_seconds": 5.16, "base_freq_hz": 1031.0, "tone_spacing_hz": 1.875, "nsps": 6400, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step37_timing_boundary_sweep:10" }, "best_row": { "variant": "mapped_ft8_gray_primary_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "ft8_gray_alt_high_demap_lsb_input+no_interleaver+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "none", "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 104, "llr_stats": { "count": 174, "avg_abs": 0.958361, "min_abs": 7.1e-05, "max_abs": 4.000238, "positive": 64, "negative": 110, "zero": 0 }, "source_rank_score": 103.833444, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "dd8d0c1a2fe76800", "codeword174_sha256_16": "5c18e421e69e1518" }, "top_rows": [ { "variant": "mapped_ft8_gray_primary_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "ft8_gray_alt_high_demap_lsb_input+no_interleaver+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "none", "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 104, "llr_stats": { "count": 174, "avg_abs": 0.958361, "min_abs": 7.1e-05, "max_abs": 4.000238, "positive": 64, "negative": 110, "zero": 0 }, "source_rank_score": 103.833444, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "dd8d0c1a2fe76800", "codeword174_sha256_16": "5c18e421e69e1518" }, { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "ft8_gray_alt_high_demap_msb_input+no_interleaver", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "none" }, "bit_count": 174, "hard_weight_174": 76, "llr_stats": { "count": 174, "avg_abs": 0.877949, "min_abs": 1.1e-05, "max_abs": 3.774078, "positive": 96, "negative": 78, "zero": 0 }, "source_rank_score": 103.511796, "syndrome_weight": 28, "valid_codeword_hard_decision": false, "message91_sha256_16": "590cfa08afeff722", "codeword174_sha256_16": "9ee9a55b58951fa8" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "lsb_within_each_tone+ft8_bitrev_deinterleave_rx_to_codeword+inverted_bits", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 101, "llr_stats": { "count": 174, "avg_abs": 1.180614, "min_abs": 7.9e-05, "max_abs": 3.822017, "positive": 72, "negative": 102, "zero": 0 }, "source_rank_score": 104.722456, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "d50b3a7b36865068", "codeword174_sha256_16": "3a0e5d7f6b979113" }, { "variant": "reverse_symbol_order", "transform": "lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse+inverted_bits", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 128, "llr_stats": { "count": 174, "avg_abs": 1.831041, "min_abs": 0.001072, "max_abs": 4.000238, "positive": 45, "negative": 129, "zero": 0 }, "source_rank_score": 111.324164, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "cd3a5844ecbfb64c", "codeword174_sha256_16": "b7569394324444f4" }, { "variant": "reverse_symbol_order", "transform": "raw_msb+no_interleaver", "mapping_meta": { "tone_mapping": "raw_msb", "interleaver": "none" }, "bit_count": 174, "hard_weight_174": 46, "llr_stats": { "count": 174, "avg_abs": 1.831041, "min_abs": 0.001072, "max_abs": 4.000238, "positive": 129, "negative": 45, "zero": 0 }, "source_rank_score": 111.324164, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "98562575066874e1", "codeword174_sha256_16": "9172d9df5194386b" }, { "variant": "reverse_full_bitstream", "transform": "lsb_within_each_tone+no_interleaver", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "none" }, "bit_count": 174, "hard_weight_174": 46, "llr_stats": { "count": 174, "avg_abs": 1.831041, "min_abs": 0.001072, "max_abs": 4.000238, "positive": 129, "negative": 45, "zero": 0 }, "source_rank_score": 110.324164, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "98562575066874e1", "codeword174_sha256_16": "9172d9df5194386b" }, { "variant": "reverse_full_bitstream", "transform": "raw_msb+ft8_bitrev_interleave_codeword_to_rx_inverse+inverted_bits", "mapping_meta": { "tone_mapping": "raw_msb", "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 128, "llr_stats": { "count": 174, "avg_abs": 1.831041, "min_abs": 0.001072, "max_abs": 4.000238, "positive": 45, "negative": 129, "zero": 0 }, "source_rank_score": 110.324164, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "cd3a5844ecbfb64c", "codeword174_sha256_16": "b7569394324444f4" }, { "variant": "mapped_lsb_within_each_tone+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "lsb_within_each_tone+ft8_bitrev_deinterleave_rx_to_codeword", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 46, "llr_stats": { "count": 174, "avg_abs": 1.831041, "min_abs": 0.001072, "max_abs": 4.000238, "positive": 129, "negative": 45, "zero": 0 }, "source_rank_score": 107.324164, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "a0085229b6c78ebd", "codeword174_sha256_16": "ac267048c2750dfc" } ], "warnings": [ "Step 37 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 37 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 37 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 37 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." ] }, { "combination_index": 30, "offsets": { "start_offset_s": 0.84, "base_freq_offset_hz": 6.0, "tone_spacing_offset_hz": 0.0 }, "anchor_applied": { "start_seconds": 5.64, "base_freq_hz": 1031.0, "tone_spacing_hz": 1.875, "nsps": 6400 }, "pipeline_ok": true, "fec_input_summary": { "soft_bit_count": 174, "missing_soft_bits": 0, "complete_ldpc_input_candidate": true, "llr_convention": "positive=bit0_more_likely, negative=bit1_more_likely, MSB-first candidate" }, "sync_candidate": { "start_sample": 67680, "start_seconds": 5.64, "base_freq_hz": 1031.0, "tone_spacing_hz": 1.875, "nsps": 6400, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step37_timing_boundary_sweep:30" }, "best_row": { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+no_interleaver", "transform": "ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 104, "llr_stats": { "count": 174, "avg_abs": 0.777342, "min_abs": 0.0, "max_abs": 2.968035, "positive": 69, "negative": 104, "zero": 1 }, "source_rank_score": 103.109368, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "134d8595552340a3", "codeword174_sha256_16": "782cb372442b4b8b" }, "top_rows": [ { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+no_interleaver", "transform": "ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 104, "llr_stats": { "count": 174, "avg_abs": 0.777342, "min_abs": 0.0, "max_abs": 2.968035, "positive": 69, "negative": 104, "zero": 1 }, "source_rank_score": 103.109368, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "134d8595552340a3", "codeword174_sha256_16": "782cb372442b4b8b" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "ft8_gray_primary_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 74, "llr_stats": { "count": 174, "avg_abs": 0.840869, "min_abs": 0.000319, "max_abs": 3.13714, "positive": 102, "negative": 72, "zero": 0 }, "source_rank_score": 103.363476, "syndrome_weight": 28, "valid_codeword_hard_decision": false, "message91_sha256_16": "b22fc54578121357", "codeword174_sha256_16": "886d45ceede031d5" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "raw_msb+ft8_bitrev_deinterleave_rx_to_codeword", "mapping_meta": { "tone_mapping": "raw_msb", "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 70, "llr_stats": { "count": 174, "avg_abs": 1.212245, "min_abs": 0.000723, "max_abs": 3.984668, "positive": 103, "negative": 71, "zero": 0 }, "source_rank_score": 104.84898, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "96409723092f5837", "codeword174_sha256_16": "f889e617852040e5" }, { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+no_interleaver", "transform": "ft8_gray_primary_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 126, "llr_stats": { "count": 174, "avg_abs": 1.208223, "min_abs": 0.000118, "max_abs": 3.928004, "positive": 52, "negative": 122, "zero": 0 }, "source_rank_score": 104.832892, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "4cb3369c98dae7c2", "codeword174_sha256_16": "64b152d54f8f1365" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 102, "llr_stats": { "count": 174, "avg_abs": 0.891101, "min_abs": 0.000126, "max_abs": 3.519051, "positive": 77, "negative": 97, "zero": 0 }, "source_rank_score": 103.564404, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "23149e565b880b0c", "codeword174_sha256_16": "3d67630628b3dfc9" }, { "variant": "mapped_raw_msb+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "ft8_gray_alt_high_demap_lsb_input+no_interleaver+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "none", "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 111, "llr_stats": { "count": 174, "avg_abs": 1.206915, "min_abs": 0.000996, "max_abs": 3.519051, "positive": 62, "negative": 112, "zero": 0 }, "source_rank_score": 104.82766, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "4345d3c578d5c90a", "codeword174_sha256_16": "541fc940bc96d565" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "ft8_gray_primary_demap_lsb_input+no_interleaver", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "none" }, "bit_count": 174, "hard_weight_174": 75, "llr_stats": { "count": 174, "avg_abs": 0.827523, "min_abs": 0.000319, "max_abs": 3.984668, "positive": 99, "negative": 75, "zero": 0 }, "source_rank_score": 103.310092, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "db225458dfe9219d", "codeword174_sha256_16": "ddc2ec2a7ab2dbe3" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "ft8_gray_alt_high_demap_lsb_input+no_interleaver+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "none", "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 91, "llr_stats": { "count": 174, "avg_abs": 0.721538, "min_abs": 0.000124, "max_abs": 3.984668, "positive": 85, "negative": 89, "zero": 0 }, "source_rank_score": 102.886152, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "24f9543314b22061", "codeword174_sha256_16": "92fac9d35bd4e846" } ], "warnings": [ "Step 37 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 37 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 37 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 37 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." ] }, { "combination_index": 7, "offsets": { "start_offset_s": 0.36, "base_freq_offset_hz": 3.0, "tone_spacing_offset_hz": 0.0 }, "anchor_applied": { "start_seconds": 5.16, "base_freq_hz": 1028.0, "tone_spacing_hz": 1.875, "nsps": 6400 }, "pipeline_ok": true, "fec_input_summary": { "soft_bit_count": 174, "missing_soft_bits": 0, "complete_ldpc_input_candidate": true, "llr_convention": "positive=bit0_more_likely, negative=bit1_more_likely, MSB-first candidate" }, "sync_candidate": { "start_sample": 61920, "start_seconds": 5.16, "base_freq_hz": 1028.0, "tone_spacing_hz": 1.875, "nsps": 6400, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step37_timing_boundary_sweep:7" }, "best_row": { "variant": "mapped_lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 27, "llr_stats": { "count": 174, "avg_abs": 2.135166, "min_abs": 0.030716, "max_abs": 4.279308, "positive": 146, "negative": 28, "zero": 0 }, "source_rank_score": 108.540664, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "6af7d27fccf41e78", "codeword174_sha256_16": "2a2e6ee5c17fc6a7" }, "top_rows": [ { "variant": "mapped_lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 27, "llr_stats": { "count": 174, "avg_abs": 2.135166, "min_abs": 0.030716, "max_abs": 4.279308, "positive": 146, "negative": 28, "zero": 0 }, "source_rank_score": 108.540664, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "6af7d27fccf41e78", "codeword174_sha256_16": "2a2e6ee5c17fc6a7" }, { "variant": "mapped_ft8_gray_primary_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "lsb_within_each_tone+ft8_bitrev_deinterleave_rx_to_codeword", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 39, "llr_stats": { "count": 174, "avg_abs": 1.561178, "min_abs": 0.024407, "max_abs": 3.909521, "positive": 136, "negative": 38, "zero": 0 }, "source_rank_score": 106.244712, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "0d958705ade463a4", "codeword174_sha256_16": "32942bf9b5cbd0a8" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "lsb_within_each_tone+ft8_bitrev_deinterleave_rx_to_codeword", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 39, "llr_stats": { "count": 174, "avg_abs": 1.509122, "min_abs": 0.011947, "max_abs": 3.909521, "positive": 134, "negative": 40, "zero": 0 }, "source_rank_score": 106.036488, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "0d958705ade463a4", "codeword174_sha256_16": "32942bf9b5cbd0a8" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+no_interleaver", "transform": "ft8_gray_primary_demap_lsb_input+no_interleaver+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "none", "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 135, "llr_stats": { "count": 174, "avg_abs": 1.182045, "min_abs": 0.00755, "max_abs": 3.351448, "positive": 31, "negative": 143, "zero": 0 }, "source_rank_score": 104.72818, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "e257437bdc688091", "codeword174_sha256_16": "f478a3303e1ea104" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+no_interleaver", "transform": "ft8_gray_alt_high_demap_lsb_input+no_interleaver+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "none", "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 133, "llr_stats": { "count": 174, "avg_abs": 1.134429, "min_abs": 0.000466, "max_abs": 3.112514, "positive": 30, "negative": 144, "zero": 0 }, "source_rank_score": 104.537716, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "e257437bdc688091", "codeword174_sha256_16": "cff144d73d67769b" }, { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+no_interleaver", "transform": "ft8_gray_primary_demap_lsb_input+no_interleaver+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "none", "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 135, "llr_stats": { "count": 174, "avg_abs": 1.132122, "min_abs": 0.005105, "max_abs": 2.993348, "positive": 34, "negative": 140, "zero": 0 }, "source_rank_score": 104.528488, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "e257437bdc688091", "codeword174_sha256_16": "f478a3303e1ea104" }, { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+no_interleaver", "transform": "ft8_gray_alt_high_demap_lsb_input+no_interleaver+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "none", "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 133, "llr_stats": { "count": 174, "avg_abs": 1.100678, "min_abs": 0.000291, "max_abs": 2.993348, "positive": 40, "negative": 134, "zero": 0 }, "source_rank_score": 104.402712, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "e257437bdc688091", "codeword174_sha256_16": "cff144d73d67769b" }, { "variant": "mapped_lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "ft8_gray_primary_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 37, "llr_stats": { "count": 174, "avg_abs": 1.63486, "min_abs": 0.006652, "max_abs": 4.279308, "positive": 137, "negative": 37, "zero": 0 }, "source_rank_score": 106.53944, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "170579202ba4fd01", "codeword174_sha256_16": "c51740bbee705cfa" } ], "warnings": [ "Step 37 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 37 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 37 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 37 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." ] }, { "combination_index": 2, "offsets": { "start_offset_s": 0.24, "base_freq_offset_hz": 3.0, "tone_spacing_offset_hz": 0.0 }, "anchor_applied": { "start_seconds": 5.04, "base_freq_hz": 1028.0, "tone_spacing_hz": 1.875, "nsps": 6400 }, "pipeline_ok": true, "fec_input_summary": { "soft_bit_count": 174, "missing_soft_bits": 0, "complete_ldpc_input_candidate": true, "llr_convention": "positive=bit0_more_likely, negative=bit1_more_likely, MSB-first candidate" }, "sync_candidate": { "start_sample": 60480, "start_seconds": 5.04, "base_freq_hz": 1028.0, "tone_spacing_hz": 1.875, "nsps": 6400, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step37_timing_boundary_sweep:2" }, "best_row": { "variant": "mapped_ft8_gray_primary_demap_msb_input+no_interleaver", "transform": "ft8_gray_primary_demap_msb_input+no_interleaver", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "none" }, "bit_count": 174, "hard_weight_174": 39, "llr_stats": { "count": 174, "avg_abs": 1.541222, "min_abs": 1.6e-05, "max_abs": 4.477513, "positive": 143, "negative": 31, "zero": 0 }, "source_rank_score": 106.164888, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "0d978b9a72686ac0", "codeword174_sha256_16": "519e5469c99fcb70" }, "top_rows": [ { "variant": "mapped_ft8_gray_primary_demap_msb_input+no_interleaver", "transform": "ft8_gray_primary_demap_msb_input+no_interleaver", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "none" }, "bit_count": 174, "hard_weight_174": 39, "llr_stats": { "count": 174, "avg_abs": 1.541222, "min_abs": 1.6e-05, "max_abs": 4.477513, "positive": 143, "negative": 31, "zero": 0 }, "source_rank_score": 106.164888, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "0d978b9a72686ac0", "codeword174_sha256_16": "519e5469c99fcb70" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+no_interleaver", "transform": "ft8_gray_alt_high_demap_msb_input+no_interleaver", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "none" }, "bit_count": 174, "hard_weight_174": 39, "llr_stats": { "count": 174, "avg_abs": 1.491462, "min_abs": 0.000227, "max_abs": 4.477513, "positive": 139, "negative": 35, "zero": 0 }, "source_rank_score": 105.965848, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "0d978b9a72686ac0", "codeword174_sha256_16": "519e5469c99fcb70" }, { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+no_interleaver", "transform": "ft8_gray_primary_demap_msb_input+no_interleaver", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "none" }, "bit_count": 174, "hard_weight_174": 39, "llr_stats": { "count": 174, "avg_abs": 1.488726, "min_abs": 0.001552, "max_abs": 4.477513, "positive": 132, "negative": 42, "zero": 0 }, "source_rank_score": 105.954904, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "0d978b9a72686ac0", "codeword174_sha256_16": "519e5469c99fcb70" }, { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+no_interleaver", "transform": "ft8_gray_alt_high_demap_msb_input+no_interleaver", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "none" }, "bit_count": 174, "hard_weight_174": 39, "llr_stats": { "count": 174, "avg_abs": 1.458218, "min_abs": 4.4e-05, "max_abs": 4.477513, "positive": 136, "negative": 38, "zero": 0 }, "source_rank_score": 105.832872, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "0d978b9a72686ac0", "codeword174_sha256_16": "519e5469c99fcb70" }, { "variant": "mapped_ft8_gray_primary_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "lsb_within_each_tone+no_interleaver+inverted_bits", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "none", "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 120, "llr_stats": { "count": 174, "avg_abs": 1.365677, "min_abs": 0.002808, "max_abs": 3.752602, "positive": 45, "negative": 129, "zero": 0 }, "source_rank_score": 105.462708, "syndrome_weight": 28, "valid_codeword_hard_decision": false, "message91_sha256_16": "a7de088c5776ee4c", "codeword174_sha256_16": "48e697d4e924baaf" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "lsb_within_each_tone+no_interleaver+inverted_bits", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "none", "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 120, "llr_stats": { "count": 174, "avg_abs": 1.29832, "min_abs": 0.001373, "max_abs": 3.752602, "positive": 52, "negative": 122, "zero": 0 }, "source_rank_score": 105.19328, "syndrome_weight": 28, "valid_codeword_hard_decision": false, "message91_sha256_16": "a7de088c5776ee4c", "codeword174_sha256_16": "48e697d4e924baaf" }, { "variant": "mapped_lsb_within_each_tone+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "raw_msb+ft8_bitrev_deinterleave_rx_to_codeword+inverted_bits", "mapping_meta": { "tone_mapping": "raw_msb", "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 141, "llr_stats": { "count": 174, "avg_abs": 2.035905, "min_abs": 0.01297, "max_abs": 4.477513, "positive": 32, "negative": 142, "zero": 0 }, "source_rank_score": 108.14362, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "ca41f125d3d51da3", "codeword174_sha256_16": "19a24fdc96d8b86a" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "lsb_within_each_tone+no_interleaver+inverted_bits", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "none", "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 134, "llr_stats": { "count": 174, "avg_abs": 1.726608, "min_abs": 0.002808, "max_abs": 4.477513, "positive": 32, "negative": 142, "zero": 0 }, "source_rank_score": 106.906432, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "ccf98b56e2b7d3b5", "codeword174_sha256_16": "a0709a0b831a9951" } ], "warnings": [ "Step 37 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 37 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 37 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 37 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." ] }, { "combination_index": 24, "offsets": { "start_offset_s": 0.72, "base_freq_offset_hz": 5.0, "tone_spacing_offset_hz": 0.0 }, "anchor_applied": { "start_seconds": 5.52, "base_freq_hz": 1030.0, "tone_spacing_hz": 1.875, "nsps": 6400 }, "pipeline_ok": true, "fec_input_summary": { "soft_bit_count": 174, "missing_soft_bits": 0, "complete_ldpc_input_candidate": true, "llr_convention": "positive=bit0_more_likely, negative=bit1_more_likely, MSB-first candidate" }, "sync_candidate": { "start_sample": 66240, "start_seconds": 5.52, "base_freq_hz": 1030.0, "tone_spacing_hz": 1.875, "nsps": 6400, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step37_timing_boundary_sweep:24" }, "best_row": { "variant": "mapped_ft8_gray_primary_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "ft8_gray_primary_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 45, "llr_stats": { "count": 174, "avg_abs": 1.285644, "min_abs": 0.005783, "max_abs": 3.811853, "positive": 134, "negative": 40, "zero": 0 }, "source_rank_score": 105.142576, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "21fef934b7ea1239", "codeword174_sha256_16": "8a5dcc77d2218918" }, "top_rows": [ { "variant": "mapped_ft8_gray_primary_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "ft8_gray_primary_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 45, "llr_stats": { "count": 174, "avg_abs": 1.285644, "min_abs": 0.005783, "max_abs": 3.811853, "positive": 134, "negative": 40, "zero": 0 }, "source_rank_score": 105.142576, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "21fef934b7ea1239", "codeword174_sha256_16": "8a5dcc77d2218918" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "lsb_within_each_tone+no_interleaver", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "none" }, "bit_count": 174, "hard_weight_174": 47, "llr_stats": { "count": 174, "avg_abs": 1.516479, "min_abs": 0.004222, "max_abs": 3.954649, "positive": 129, "negative": 45, "zero": 0 }, "source_rank_score": 106.065916, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "9f805f54fdc77a1f", "codeword174_sha256_16": "15b2d2793da1db6d" }, { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "ft8_gray_primary_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 133, "llr_stats": { "count": 174, "avg_abs": 1.314436, "min_abs": 0.015697, "max_abs": 3.970707, "positive": 38, "negative": 136, "zero": 0 }, "source_rank_score": 105.257744, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "4b167f7df5c51509", "codeword174_sha256_16": "1772246f7777b51e" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "ft8_gray_alt_high_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 125, "llr_stats": { "count": 174, "avg_abs": 1.198175, "min_abs": 0.00288, "max_abs": 3.811853, "positive": 44, "negative": 130, "zero": 0 }, "source_rank_score": 104.7927, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "253deeae1430be52", "codeword174_sha256_16": "37660ea01956a6f5" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "ft8_gray_alt_high_demap_msb_input+no_interleaver", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "none" }, "bit_count": 174, "hard_weight_174": 52, "llr_stats": { "count": 174, "avg_abs": 1.195525, "min_abs": 0.005151, "max_abs": 3.833579, "positive": 129, "negative": 45, "zero": 0 }, "source_rank_score": 104.7821, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "34a759dcdbb7894d", "codeword174_sha256_16": "779f7504ec1ebfcb" }, { "variant": "mapped_ft8_gray_primary_demap_lsb_input+no_interleaver", "transform": "ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 46, "llr_stats": { "count": 174, "avg_abs": 1.078343, "min_abs": 0.0001, "max_abs": 3.186186, "positive": 130, "negative": 44, "zero": 0 }, "source_rank_score": 104.313372, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "ecc3490a020333b2", "codeword174_sha256_16": "6bf84c7cd2e6f56c" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "lsb_within_each_tone+ft8_bitrev_deinterleave_rx_to_codeword", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 47, "llr_stats": { "count": 174, "avg_abs": 1.516479, "min_abs": 0.004222, "max_abs": 3.954649, "positive": 129, "negative": 45, "zero": 0 }, "source_rank_score": 106.065916, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "dbf9d72197977fc8", "codeword174_sha256_16": "b49d6a6f890bfbc2" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "ft8_gray_primary_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 133, "llr_stats": { "count": 174, "avg_abs": 1.35069, "min_abs": 0.02101, "max_abs": 3.970707, "positive": 37, "negative": 137, "zero": 0 }, "source_rank_score": 105.40276, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "e350ff3245c41ffa", "codeword174_sha256_16": "870b18dc46b3200f" } ], "warnings": [ "Step 37 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 37 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 37 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 37 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." ] }, { "combination_index": 25, "offsets": { "start_offset_s": 0.72, "base_freq_offset_hz": 6.0, "tone_spacing_offset_hz": 0.0 }, "anchor_applied": { "start_seconds": 5.52, "base_freq_hz": 1031.0, "tone_spacing_hz": 1.875, "nsps": 6400 }, "pipeline_ok": true, "fec_input_summary": { "soft_bit_count": 174, "missing_soft_bits": 0, "complete_ldpc_input_candidate": true, "llr_convention": "positive=bit0_more_likely, negative=bit1_more_likely, MSB-first candidate" }, "sync_candidate": { "start_sample": 66240, "start_seconds": 5.52, "base_freq_hz": 1031.0, "tone_spacing_hz": 1.875, "nsps": 6400, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step37_timing_boundary_sweep:25" }, "best_row": { "variant": "mapped_ft8_gray_primary_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse+inverted_bits", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 105, "llr_stats": { "count": 174, "avg_abs": 1.263236, "min_abs": 0.003396, "max_abs": 4.053991, "positive": 65, "negative": 109, "zero": 0 }, "source_rank_score": 105.052944, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "f76a79414f1b8ddb", "codeword174_sha256_16": "224c42865c325d8a" }, "top_rows": [ { "variant": "mapped_ft8_gray_primary_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse+inverted_bits", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 105, "llr_stats": { "count": 174, "avg_abs": 1.263236, "min_abs": 0.003396, "max_abs": 4.053991, "positive": 65, "negative": 109, "zero": 0 }, "source_rank_score": 105.052944, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "f76a79414f1b8ddb", "codeword174_sha256_16": "224c42865c325d8a" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+no_interleaver", "transform": "ft8_gray_alt_high_demap_lsb_input+no_interleaver+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "none", "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 103, "llr_stats": { "count": 174, "avg_abs": 0.769284, "min_abs": 1.9e-05, "max_abs": 2.462506, "positive": 64, "negative": 110, "zero": 0 }, "source_rank_score": 103.077136, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "ef7eccc2f78c5191", "codeword174_sha256_16": "848e7876230a1c0d" }, { "variant": "mapped_lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "raw_msb+ft8_bitrev_interleave_codeword_to_rx_inverse+inverted_bits", "mapping_meta": { "tone_mapping": "raw_msb", "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 128, "llr_stats": { "count": 174, "avg_abs": 1.834433, "min_abs": 0.003396, "max_abs": 4.349393, "positive": 41, "negative": 133, "zero": 0 }, "source_rank_score": 107.337732, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "a2a946eef87a2491", "codeword174_sha256_16": "144f4835b75ffcc3" }, { "variant": "mapped_raw_msb+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "ft8_gray_primary_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "mapping_meta": { "tone_mapping": "ft8_gray_primary", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 56, "llr_stats": { "count": 174, "avg_abs": 1.320972, "min_abs": 0.001911, "max_abs": 4.053991, "positive": 126, "negative": 48, "zero": 0 }, "source_rank_score": 105.283888, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "0bda7f7b333e2c46", "codeword174_sha256_16": "884becb33bd506ac" }, { "variant": "mapped_lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 111, "llr_stats": { "count": 174, "avg_abs": 1.242177, "min_abs": 0.002244, "max_abs": 4.223276, "positive": 60, "negative": 114, "zero": 0 }, "source_rank_score": 104.968708, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "b9014d42f0c2c245", "codeword174_sha256_16": "08c64c0b4932570a" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+no_interleaver", "transform": "ft8_gray_alt_high_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword+inverted_bits", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": false, "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 127, "llr_stats": { "count": 174, "avg_abs": 1.209123, "min_abs": 1.9e-05, "max_abs": 4.223276, "positive": 40, "negative": 134, "zero": 0 }, "source_rank_score": 104.836492, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "80407faf6d1a1705", "codeword174_sha256_16": "38b950708776c704" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+no_interleaver", "transform": "ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 71, "llr_stats": { "count": 174, "avg_abs": 0.769284, "min_abs": 1.9e-05, "max_abs": 2.462506, "positive": 110, "negative": 64, "zero": 0 }, "source_rank_score": 103.077136, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "0ac01e0b305b9cfa", "codeword174_sha256_16": "99fcb433a8efd133" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "mapping_meta": { "tone_mapping": "ft8_gray_alt_high", "gray_direction": "inverse_observed_to_plain", "reverse_bits_within_tone_before_gray": true, "interleaver": "ft8_bitrev", "direction": "deinterleave_rx_to_codeword", "order_len": 174 }, "bit_count": 174, "hard_weight_174": 81, "llr_stats": { "count": 174, "avg_abs": 0.760033, "min_abs": 2e-06, "max_abs": 2.8447, "positive": 92, "negative": 82, "zero": 0 }, "source_rank_score": 103.040132, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "bf55efef383656ea", "codeword174_sha256_16": "d5276956bc4d4bcc" } ], "warnings": [ "Step 37 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 37 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 37 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 37 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." ] } ], "outputs": { "timing_boundary_sweep_json": "/decoders/js8_decoder/runtime/timing_boundary_sweep/step37_timing_boundary_sweep.json", "timing_best_candidate_json": "/decoders/js8_decoder/runtime/timing_boundary_sweep/step37_best_timing_fec_candidate.json" }, "decodes": [], "warnings": [ "Step 37 expands the Step36 edge hit and exports the best timing candidate for downstream LDPC soft-decode.", "No JS8 text unpack or CRC validation is performed yet.", "No valid LDPC codeword found is a diagnostic warning, not a hard command failure." ], "next_action": "Use outputs.timing_best_candidate_json for LDPC matrix/soft decode. If syndrome is still far from 0, continue interleaver/LLR and symbol-boundary tuning around the best_candidate." }