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"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": 36, "llr_stats": { "count": 174, "avg_abs": 1.289323, "min_abs": 0.000933, "max_abs": 3.895705, "positive": 129, "negative": 45, "zero": 0 }, "source_rank_score": 105.157292, "syndrome_weight": 22, "valid_codeword_hard_decision": false, "message91_sha256_16": "d4ca2a05f15dd009", "codeword174_sha256_16": "95a1e941fbdff6b2" }, { "variant": "mapped_ft8_gray_primary_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "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": 61, "llr_stats": { "count": 174, "avg_abs": 1.11433, "min_abs": 0.000187, "max_abs": 3.795489, "positive": 110, "negative": 64, "zero": 0 }, "source_rank_score": 104.45732, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "bab866be6de1cc5a", "codeword174_sha256_16": "4b4b446b1e4f7aae" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "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": 61, "llr_stats": { "count": 174, "avg_abs": 1.079292, "min_abs": 0.000226, "max_abs": 3.795489, "positive": 110, "negative": 64, "zero": 0 }, "source_rank_score": 104.317168, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "bab866be6de1cc5a", "codeword174_sha256_16": "4b4b446b1e4f7aae" }, { "variant": "lab_mask_xor_preview", "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": 93, "llr_stats": { "count": 174, "avg_abs": 1.818736, "min_abs": 0.003108, "max_abs": 4.379379, "positive": 34, "negative": 140, "zero": 0 }, "source_rank_score": 99.274944, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "4439454e612f6636", "codeword174_sha256_16": "953e2bc596e8a67e" }, { "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": 45, "llr_stats": { "count": 174, "avg_abs": 1.666423, "min_abs": 0.002022, "max_abs": 3.950111, "positive": 124, "negative": 50, "zero": 0 }, "source_rank_score": 106.665692, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "1bf4f3a7e6e5f651", "codeword174_sha256_16": "daeb23bbbdf896b0" }, { "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": 45, "llr_stats": { "count": 174, "avg_abs": 1.625634, "min_abs": 0.003108, "max_abs": 3.895705, "positive": 124, "negative": 50, "zero": 0 }, "source_rank_score": 106.502536, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "1bf4f3a7e6e5f651", "codeword174_sha256_16": "daeb23bbbdf896b0" }, { "variant": "mapped_lsb_within_each_tone+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": 45, "llr_stats": { "count": 174, "avg_abs": 1.617209, "min_abs": 0.001539, "max_abs": 3.944456, "positive": 123, "negative": 51, "zero": 0 }, "source_rank_score": 106.468836, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "202d2650a31499d7", "codeword174_sha256_16": "6c43e3bd22022c79" } ], "warnings": [ "Step 51 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 51 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 51 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 51 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": 11, "offsets": { "start_offset_s": 0.0, "base_freq_offset_hz": 3.0, "tone_spacing_offset_hz": -0.03 }, "anchor_applied": { "start_seconds": 4.8, "base_freq_hz": 1028.0, "tone_spacing_hz": 1.9079844961240309, "nsps": 6192 }, "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": 57600, "start_seconds": 4.8, "base_freq_hz": 1028.0, "tone_spacing_hz": 1.9079844961240309, "nsps": 6192, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step51_source_aligned_timing_sweep:11" }, 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"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": 36, "llr_stats": { "count": 174, "avg_abs": 1.291598, "min_abs": 0.001433, "max_abs": 3.895705, "positive": 129, "negative": 45, "zero": 0 }, "source_rank_score": 105.166392, "syndrome_weight": 22, "valid_codeword_hard_decision": false, "message91_sha256_16": "d4ca2a05f15dd009", "codeword174_sha256_16": "95a1e941fbdff6b2" }, { "variant": "mapped_ft8_gray_primary_demap_lsb_input+no_interleaver", "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": 36, "llr_stats": { "count": 174, "avg_abs": 1.289323, "min_abs": 0.000933, "max_abs": 3.895705, "positive": 129, "negative": 45, "zero": 0 }, "source_rank_score": 105.157292, "syndrome_weight": 22, "valid_codeword_hard_decision": false, "message91_sha256_16": "d4ca2a05f15dd009", "codeword174_sha256_16": "95a1e941fbdff6b2" }, { "variant": "mapped_ft8_gray_primary_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "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": 61, "llr_stats": { "count": 174, "avg_abs": 1.11433, "min_abs": 0.000187, "max_abs": 3.795489, "positive": 110, "negative": 64, "zero": 0 }, "source_rank_score": 104.45732, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "bab866be6de1cc5a", "codeword174_sha256_16": "4b4b446b1e4f7aae" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "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": 61, "llr_stats": { "count": 174, "avg_abs": 1.079292, "min_abs": 0.000226, "max_abs": 3.795489, "positive": 110, "negative": 64, "zero": 0 }, "source_rank_score": 104.317168, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "bab866be6de1cc5a", "codeword174_sha256_16": "4b4b446b1e4f7aae" }, { "variant": "lab_mask_xor_preview", "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": 93, "llr_stats": { "count": 174, "avg_abs": 1.818736, "min_abs": 0.003108, "max_abs": 4.379379, "positive": 34, "negative": 140, "zero": 0 }, "source_rank_score": 99.274944, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "4439454e612f6636", "codeword174_sha256_16": "953e2bc596e8a67e" }, { "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": 45, "llr_stats": { "count": 174, "avg_abs": 1.666423, "min_abs": 0.002022, "max_abs": 3.950111, "positive": 124, "negative": 50, "zero": 0 }, "source_rank_score": 106.665692, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "1bf4f3a7e6e5f651", "codeword174_sha256_16": "daeb23bbbdf896b0" }, { "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": 45, "llr_stats": { "count": 174, "avg_abs": 1.625634, "min_abs": 0.003108, "max_abs": 3.895705, "positive": 124, "negative": 50, "zero": 0 }, "source_rank_score": 106.502536, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "1bf4f3a7e6e5f651", "codeword174_sha256_16": "daeb23bbbdf896b0" }, { "variant": "mapped_lsb_within_each_tone+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": 45, "llr_stats": { "count": 174, "avg_abs": 1.617209, "min_abs": 0.001539, "max_abs": 3.944456, "positive": 123, "negative": 51, "zero": 0 }, "source_rank_score": 106.468836, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "202d2650a31499d7", "codeword174_sha256_16": "6c43e3bd22022c79" } ], "warnings": [ "Step 51 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 51 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 51 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 51 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": 0.0, "base_freq_offset_hz": 1.5, "tone_spacing_offset_hz": -0.03 }, "anchor_applied": { "start_seconds": 4.8, "base_freq_hz": 1026.5, "tone_spacing_hz": 1.9079844961240309, "nsps": 6192 }, "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": 57600, "start_seconds": 4.8, "base_freq_hz": 1026.5, "tone_spacing_hz": 1.9079844961240309, "nsps": 6192, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step51_source_aligned_timing_sweep:2" }, "best_row": { "variant": "mapped_raw_msb+ft8_bitrev_interleave_codeword_to_rx_inverse", "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": 127, "llr_stats": { "count": 174, "avg_abs": 1.733511, "min_abs": 0.012055, "max_abs": 4.121456, "positive": 45, "negative": 129, "zero": 0 }, "source_rank_score": 106.934044, "syndrome_weight": 23, "valid_codeword_hard_decision": false, "message91_sha256_16": "392cab12a34759b9", "codeword174_sha256_16": "5e40b5a83c672886" }, "top_rows": [ { "variant": "mapped_raw_msb+ft8_bitrev_interleave_codeword_to_rx_inverse", "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": 127, "llr_stats": { "count": 174, "avg_abs": 1.733511, "min_abs": 0.012055, "max_abs": 4.121456, "positive": 45, "negative": 129, "zero": 0 }, "source_rank_score": 106.934044, "syndrome_weight": 23, "valid_codeword_hard_decision": false, "message91_sha256_16": "392cab12a34759b9", "codeword174_sha256_16": "5e40b5a83c672886" }, { "variant": "reverse_symbol_order", "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": 44, "llr_stats": { "count": 174, "avg_abs": 1.881544, "min_abs": 0.008612, "max_abs": 4.094064, "positive": 115, "negative": 59, "zero": 0 }, "source_rank_score": 111.526176, "syndrome_weight": 28, "valid_codeword_hard_decision": false, "message91_sha256_16": "128117b042d0d534", "codeword174_sha256_16": "b0809bdee52aa2eb" }, { "variant": "reverse_full_bitstream", "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": 44, "llr_stats": { "count": 174, "avg_abs": 2.029253, "min_abs": 0.008612, "max_abs": 4.159387, "positive": 134, "negative": 40, "zero": 0 }, "source_rank_score": 111.117012, "syndrome_weight": 28, "valid_codeword_hard_decision": false, "message91_sha256_16": "128117b042d0d534", "codeword174_sha256_16": "b0809bdee52aa2eb" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "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": 113, "llr_stats": { "count": 174, "avg_abs": 1.409152, "min_abs": 0.001536, "max_abs": 4.121456, "positive": 53, "negative": 121, "zero": 0 }, "source_rank_score": 105.636608, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "a7ec7573558f6d66", "codeword174_sha256_16": "fd238f7999c92f54" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "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": 97, "llr_stats": { "count": 174, "avg_abs": 1.258287, "min_abs": 0.00739, "max_abs": 4.094064, "positive": 73, "negative": 101, "zero": 0 }, "source_rank_score": 105.033148, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "10a0624085517fbb", "codeword174_sha256_16": "2e36371617234c9c" }, { "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": 1.691846, "min_abs": 3.9e-05, "max_abs": 4.159387, "positive": 139, "negative": 35, "zero": 0 }, "source_rank_score": 106.767384, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "fa72b5aad0016ab4", "codeword174_sha256_16": "9a4cfc262b798d41" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+no_interleaver", "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": 44, "llr_stats": { "count": 174, "avg_abs": 1.342044, "min_abs": 3.9e-05, "max_abs": 3.408185, "positive": 130, "negative": 44, "zero": 0 }, "source_rank_score": 105.368176, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "ff6f9fd31170e8ba", "codeword174_sha256_16": "1740cb3878bab5bf" }, { "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": 109, "llr_stats": { "count": 174, "avg_abs": 1.807528, "min_abs": 0.007795, "max_abs": 4.094064, "positive": 65, "negative": 109, "zero": 0 }, "source_rank_score": 125.230112, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "07b13c8ed6906112", "codeword174_sha256_16": "00e44a669eea08bb" } ], "warnings": [ "Step 51 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 51 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 51 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 51 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": 1, "offsets": { "start_offset_s": 0.0, "base_freq_offset_hz": 1.5, "tone_spacing_offset_hz": 0.0 }, "anchor_applied": { "start_seconds": 4.8, "base_freq_hz": 1026.5, "tone_spacing_hz": 1.937984496124031, "nsps": 6192 }, "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": 57600, "start_seconds": 4.8, "base_freq_hz": 1026.5, "tone_spacing_hz": 1.937984496124031, "nsps": 6192, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step51_source_aligned_timing_sweep:1" }, "best_row": { "variant": "mapped_raw_msb+ft8_bitrev_interleave_codeword_to_rx_inverse", "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": 123, "llr_stats": { "count": 174, "avg_abs": 1.615244, "min_abs": 0.009081, "max_abs": 4.107793, "positive": 49, "negative": 125, "zero": 0 }, "source_rank_score": 106.460976, "syndrome_weight": 25, "valid_codeword_hard_decision": false, "message91_sha256_16": "392cab12a34759b9", "codeword174_sha256_16": "5ae8d6b48d414f34" }, "top_rows": [ { "variant": "mapped_raw_msb+ft8_bitrev_interleave_codeword_to_rx_inverse", "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": 123, "llr_stats": { "count": 174, "avg_abs": 1.615244, "min_abs": 0.009081, "max_abs": 4.107793, "positive": 49, "negative": 125, "zero": 0 }, "source_rank_score": 106.460976, "syndrome_weight": 25, "valid_codeword_hard_decision": false, "message91_sha256_16": "392cab12a34759b9", "codeword174_sha256_16": "5ae8d6b48d414f34" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "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": 95, "llr_stats": { "count": 174, "avg_abs": 1.197035, "min_abs": 0.00517, "max_abs": 3.968945, "positive": 71, "negative": 103, "zero": 0 }, "source_rank_score": 104.78814, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "92b10effeeeb19a8", "codeword174_sha256_16": "1c65597835257916" }, { "variant": "reverse_symbol_order", "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": 43, "llr_stats": { "count": 174, "avg_abs": 1.775836, "min_abs": 0.021293, "max_abs": 4.112074, "positive": 117, "negative": 57, "zero": 0 }, "source_rank_score": 111.103344, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "c94e2d2f80c7bd08", "codeword174_sha256_16": "746597535b28b3a5" }, { "variant": "reverse_full_bitstream", "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": 43, "llr_stats": { "count": 174, "avg_abs": 1.924785, "min_abs": 0.021293, "max_abs": 4.127648, "positive": 135, "negative": 39, "zero": 0 }, "source_rank_score": 110.69914, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "c94e2d2f80c7bd08", "codeword174_sha256_16": "746597535b28b3a5" }, { "variant": "mapped_ft8_gray_primary_demap_msb_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": 43, "llr_stats": { "count": 174, "avg_abs": 1.924785, "min_abs": 0.021293, "max_abs": 4.127648, "positive": 135, "negative": 39, "zero": 0 }, "source_rank_score": 107.69914, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "9a11ea1dd34fbb3d", "codeword174_sha256_16": "66658ed247b41bb0" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "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": 108, "llr_stats": { "count": 174, "avg_abs": 1.69607, "min_abs": 0.003643, "max_abs": 4.112074, "positive": 65, "negative": 109, "zero": 0 }, "source_rank_score": 106.78428, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "842583d1534d7dbc", "codeword174_sha256_16": "74a25cd15e35b3d5" }, { "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": 108, "llr_stats": { "count": 174, "avg_abs": 1.69607, "min_abs": 0.003643, "max_abs": 4.112074, "positive": 65, "negative": 109, "zero": 0 }, "source_rank_score": 106.78428, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "62e51936630c641e", "codeword174_sha256_16": "c52150be96d8413f" }, { "variant": "mapped_ft8_gray_primary_demap_msb_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": 110, "llr_stats": { "count": 174, "avg_abs": 1.276774, "min_abs": 0.005048, "max_abs": 4.107793, "positive": 53, "negative": 121, "zero": 0 }, "source_rank_score": 105.107096, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "effdee3cae80cf8e", "codeword174_sha256_16": "1bb03d72bab96f47" } ], "warnings": [ "Step 51 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 51 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 51 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 51 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": 43, "offsets": { "start_offset_s": 0.06, "base_freq_offset_hz": 3.5, "tone_spacing_offset_hz": 0.0 }, "anchor_applied": { "start_seconds": 4.859999999999999, "base_freq_hz": 1028.5, "tone_spacing_hz": 1.937984496124031, "nsps": 6192 }, "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": 58320, "start_seconds": 4.86, "base_freq_hz": 1028.5, "tone_spacing_hz": 1.937984496124031, "nsps": 6192, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step51_source_aligned_timing_sweep:43" }, "best_row": { "variant": "mapped_ft8_gray_alt_high_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": 49, "llr_stats": { "count": 174, "avg_abs": 1.230206, "min_abs": 0.003136, "max_abs": 3.713292, "positive": 129, "negative": 45, "zero": 0 }, "source_rank_score": 104.920824, "syndrome_weight": 25, "valid_codeword_hard_decision": false, "message91_sha256_16": "e20eaf42c9d5a080", "codeword174_sha256_16": "670a833d4cd80958" }, "top_rows": [ { "variant": "mapped_ft8_gray_alt_high_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": 49, "llr_stats": { "count": 174, "avg_abs": 1.230206, "min_abs": 0.003136, "max_abs": 3.713292, "positive": 129, "negative": 45, "zero": 0 }, "source_rank_score": 104.920824, "syndrome_weight": 25, "valid_codeword_hard_decision": false, "message91_sha256_16": "e20eaf42c9d5a080", "codeword174_sha256_16": "670a833d4cd80958" }, { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "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": 57, "llr_stats": { "count": 174, "avg_abs": 1.180522, "min_abs": 7.3e-05, "max_abs": 4.114918, "positive": 116, "negative": 58, "zero": 0 }, "source_rank_score": 104.722088, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "08c336f0fdbd0b9d", "codeword174_sha256_16": "828c7698f0f759d6" }, { "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": 113, "llr_stats": { "count": 174, "avg_abs": 1.000414, "min_abs": 0.000314, "max_abs": 3.722453, "positive": 61, "negative": 113, "zero": 0 }, "source_rank_score": 104.001656, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "e9dab226fae4b28e", "codeword174_sha256_16": "6dde07ebf7b5f589" }, { "variant": "lab_mask_xor_preview", "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": 93, "llr_stats": { "count": 174, "avg_abs": 2.092034, "min_abs": 0.019209, "max_abs": 4.114918, "positive": 138, "negative": 36, "zero": 0 }, "source_rank_score": 100.368136, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "2cd135c17dd2b470", "codeword174_sha256_16": "fc7ab1ab87744044" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "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": 120, "llr_stats": { "count": 174, "avg_abs": 1.221856, "min_abs": 1.9e-05, "max_abs": 4.114918, "positive": 52, "negative": 122, "zero": 0 }, "source_rank_score": 104.887424, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "dccfb96fe1c80677", "codeword174_sha256_16": "29a87a46c7d870ae" }, { "variant": "reverse_full_bitstream", "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": 35, "llr_stats": { "count": 174, "avg_abs": 1.753358, "min_abs": 0.003136, "max_abs": 4.114918, "positive": 138, "negative": 36, "zero": 0 }, "source_rank_score": 110.013432, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "510b5025f519b4a7", "codeword174_sha256_16": "d5e243f42868b95b" }, { "variant": "reverse_symbol_order", "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": 35, "llr_stats": { "count": 174, "avg_abs": 1.451951, "min_abs": 0.003136, "max_abs": 3.728632, "positive": 120, "negative": 54, "zero": 0 }, "source_rank_score": 109.807804, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "510b5025f519b4a7", "codeword174_sha256_16": "d5e243f42868b95b" }, { "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": 47, "llr_stats": { "count": 174, "avg_abs": 1.057476, "min_abs": 2.3e-05, "max_abs": 3.114307, "positive": 128, "negative": 46, "zero": 0 }, "source_rank_score": 104.229904, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "4781b790b251315c", "codeword174_sha256_16": "777c0990b801d669" } ], "warnings": [ "Step 51 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 51 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 51 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 51 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": 0.03, "base_freq_offset_hz": 2.0, "tone_spacing_offset_hz": 0.03 }, "anchor_applied": { "start_seconds": 4.83, "base_freq_hz": 1027.0, "tone_spacing_hz": 1.967984496124031, "nsps": 6192 }, "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": 57960, "start_seconds": 4.83, "base_freq_hz": 1027.0, "tone_spacing_hz": 1.967984496124031, "nsps": 6192, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step51_source_aligned_timing_sweep:21" }, "best_row": { "variant": "mapped_ft8_gray_alt_high_demap_lsb_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": 103, "llr_stats": { "count": 174, "avg_abs": 1.014755, "min_abs": 0.001418, "max_abs": 3.82154, "positive": 71, "negative": 103, "zero": 0 }, "source_rank_score": 104.05902, "syndrome_weight": 25, "valid_codeword_hard_decision": false, "message91_sha256_16": "f6f9e2c65d361950", "codeword174_sha256_16": "a34f30514f1147be" }, "top_rows": [ { "variant": "mapped_ft8_gray_alt_high_demap_lsb_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": 103, "llr_stats": { "count": 174, "avg_abs": 1.014755, "min_abs": 0.001418, "max_abs": 3.82154, "positive": 71, "negative": 103, "zero": 0 }, "source_rank_score": 104.05902, "syndrome_weight": 25, "valid_codeword_hard_decision": false, "message91_sha256_16": "f6f9e2c65d361950", "codeword174_sha256_16": "a34f30514f1147be" }, { "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+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": 134, "llr_stats": { "count": 174, "avg_abs": 1.51667, "min_abs": 1.8e-05, "max_abs": 4.144111, "positive": 40, "negative": 134, "zero": 0 }, "source_rank_score": 106.06668, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "daab820710a9a228", "codeword174_sha256_16": "16654f047cae3428" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+no_interleaver", "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": 45, "llr_stats": { "count": 174, "avg_abs": 1.128579, "min_abs": 1.8e-05, "max_abs": 3.363492, "positive": 129, "negative": 45, "zero": 0 }, "source_rank_score": 104.514316, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "d40791f46d2a4b11", "codeword174_sha256_16": "9dca28554c5a2316" }, { "variant": "mapped_ft8_gray_primary_demap_msb_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": 58, "llr_stats": { "count": 174, "avg_abs": 1.225323, "min_abs": 0.002329, "max_abs": 3.956982, "positive": 126, "negative": 48, "zero": 0 }, "source_rank_score": 104.901292, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "a7c653e33db6db7c", "codeword174_sha256_16": "04e767b23e20bf0a" }, { "variant": "mapped_raw_msb+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "raw_msb+ft8_bitrev_interleave_codeword_to_rx_inverse", "mapping_meta": { "tone_mapping": "raw_msb", "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": 2.163748, "min_abs": 0.014686, "max_abs": 4.144111, "positive": 141, "negative": 33, "zero": 0 }, "source_rank_score": 108.654992, "syndrome_weight": 32, "valid_codeword_hard_decision": false, "message91_sha256_16": "cc61e58f86747a77", "codeword174_sha256_16": "71bebbfd08ed2f9a" }, { "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+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": 122, "llr_stats": { "count": 174, "avg_abs": 1.636108, "min_abs": 0.015006, "max_abs": 3.82154, "positive": 49, "negative": 125, "zero": 0 }, "source_rank_score": 106.544432, "syndrome_weight": 32, "valid_codeword_hard_decision": false, "message91_sha256_16": "f6de0dff4166858e", "codeword174_sha256_16": "a8a90b25176d03db" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "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": 108, "llr_stats": { "count": 174, "avg_abs": 1.159192, "min_abs": 0.003014, "max_abs": 3.956982, "positive": 60, "negative": 114, "zero": 0 }, "source_rank_score": 104.636768, "syndrome_weight": 32, "valid_codeword_hard_decision": false, "message91_sha256_16": "14fd4623952966b5", "codeword174_sha256_16": "fafeccfe3224ee30" }, { "variant": "raw_msb_symbol_order", "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": 49, "llr_stats": { "count": 174, "avg_abs": 1.750816, "min_abs": 0.003492, "max_abs": 4.144111, "positive": 127, "negative": 47, "zero": 0 }, "source_rank_score": 125.003264, "syndrome_weight": 33, "valid_codeword_hard_decision": false, "message91_sha256_16": "766a43ca41ee0172", "codeword174_sha256_16": "7d9bcf61433ea9fd" } ], "warnings": [ "Step 51 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 51 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 51 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 51 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": 39, "offsets": { "start_offset_s": 0.06, "base_freq_offset_hz": 2.5, "tone_spacing_offset_hz": 0.03 }, "anchor_applied": { "start_seconds": 4.859999999999999, "base_freq_hz": 1027.5, "tone_spacing_hz": 1.967984496124031, "nsps": 6192 }, "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": 58320, "start_seconds": 4.86, "base_freq_hz": 1027.5, "tone_spacing_hz": 1.967984496124031, "nsps": 6192, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step51_source_aligned_timing_sweep:39" }, "best_row": { "variant": "mapped_raw_msb+ft8_bitrev_interleave_codeword_to_rx_inverse", "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": 126, "llr_stats": { "count": 174, "avg_abs": 1.636445, "min_abs": 0.04144, "max_abs": 4.144109, "positive": 48, "negative": 126, "zero": 0 }, "source_rank_score": 106.54578, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "25788c17f810b7d5", "codeword174_sha256_16": "87afe3fe5c58aa69" }, "top_rows": [ { "variant": "mapped_raw_msb+ft8_bitrev_interleave_codeword_to_rx_inverse", "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": 126, "llr_stats": { "count": 174, "avg_abs": 1.636445, "min_abs": 0.04144, "max_abs": 4.144109, "positive": 48, "negative": 126, "zero": 0 }, "source_rank_score": 106.54578, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "25788c17f810b7d5", "codeword174_sha256_16": "87afe3fe5c58aa69" }, { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "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": 43, "llr_stats": { "count": 174, "avg_abs": 1.29064, "min_abs": 0.002158, "max_abs": 4.085972, "positive": 136, "negative": 38, "zero": 0 }, "source_rank_score": 105.16256, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "d7fbffc39612c219", "codeword174_sha256_16": "b1faca9af1fcf29e" }, { "variant": "mapped_lsb_within_each_tone+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": 140, "llr_stats": { "count": 174, "avg_abs": 2.221352, "min_abs": 0.057726, "max_abs": 4.144109, "positive": 35, "negative": 139, "zero": 0 }, "source_rank_score": 108.885408, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "0329e23109e06988", "codeword174_sha256_16": "cb10f2e95870a14d" }, { "variant": "mapped_raw_msb+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "ft8_gray_alt_high_demap_lsb_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": 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": 1.549534, "min_abs": 0.04144, "max_abs": 4.085972, "positive": 48, "negative": 126, "zero": 0 }, "source_rank_score": 106.198136, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "c203e9dd4e290c80", "codeword174_sha256_16": "93022f63b6f5a179" }, { "variant": "mapped_lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "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": 45, "llr_stats": { "count": 174, "avg_abs": 1.647117, "min_abs": 0.014093, "max_abs": 4.109742, "positive": 133, "negative": 41, "zero": 0 }, "source_rank_score": 106.588468, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "ce0c8b98f36c5477", "codeword174_sha256_16": "0686743576218a8e" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "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": 57, "llr_stats": { "count": 174, "avg_abs": 1.600836, "min_abs": 0.007559, "max_abs": 3.884246, "positive": 120, "negative": 54, "zero": 0 }, "source_rank_score": 106.403344, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "bccfcf3a9d2d88f9", "codeword174_sha256_16": "789a455223ead9d0" }, { "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", "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": 55, "llr_stats": { "count": 174, "avg_abs": 1.201724, "min_abs": 4.7e-05, "max_abs": 3.041852, "positive": 120, "negative": 54, "zero": 0 }, "source_rank_score": 104.806896, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "1ba13df646b9fda8", "codeword174_sha256_16": "e6afe9485a3d19c5" }, { "variant": "raw_msb_symbol_order", "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": 140, "llr_stats": { "count": 174, "avg_abs": 2.221352, "min_abs": 0.057726, "max_abs": 4.144109, "positive": 35, "negative": 139, "zero": 0 }, "source_rank_score": 126.885408, "syndrome_weight": 32, "valid_codeword_hard_decision": false, "message91_sha256_16": "064d4295f7c48336", "codeword174_sha256_16": "4b1f5a7ddad8966d" } ], "warnings": [ "Step 51 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 51 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 51 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 51 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": 8, "offsets": { "start_offset_s": 0.0, "base_freq_offset_hz": 2.5, "tone_spacing_offset_hz": -0.03 }, "anchor_applied": { "start_seconds": 4.8, "base_freq_hz": 1027.5, "tone_spacing_hz": 1.9079844961240309, "nsps": 6192 }, "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": 57600, "start_seconds": 4.8, "base_freq_hz": 1027.5, "tone_spacing_hz": 1.9079844961240309, "nsps": 6192, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step51_source_aligned_timing_sweep:8" }, "best_row": { "variant": "mapped_ft8_gray_primary_demap_msb_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": 56, "llr_stats": { "count": 174, "avg_abs": 1.265569, "min_abs": 0.007883, "max_abs": 4.01973, "positive": 124, "negative": 50, "zero": 0 }, "source_rank_score": 105.062276, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "6548c013cab69e1e", "codeword174_sha256_16": "e4a052902783f611" }, "top_rows": [ { "variant": "mapped_ft8_gray_primary_demap_msb_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": 56, "llr_stats": { "count": 174, "avg_abs": 1.265569, "min_abs": 0.007883, "max_abs": 4.01973, "positive": 124, "negative": 50, "zero": 0 }, "source_rank_score": 105.062276, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "6548c013cab69e1e", "codeword174_sha256_16": "e4a052902783f611" }, { "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": 135, "llr_stats": { "count": 174, "avg_abs": 1.595277, "min_abs": 0.001058, "max_abs": 4.048874, "positive": 36, "negative": 138, "zero": 0 }, "source_rank_score": 106.381108, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "9e57d9fb308e6dee", "codeword174_sha256_16": "cc67285942c115ea" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+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": 142, "llr_stats": { "count": 174, "avg_abs": 1.609719, "min_abs": 0.001956, "max_abs": 4.292074, "positive": 27, "negative": 147, "zero": 0 }, "source_rank_score": 106.438876, "syndrome_weight": 28, "valid_codeword_hard_decision": false, "message91_sha256_16": "6b3d67c760fd57be", "codeword174_sha256_16": "732f86ed92cad209" }, { "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": 135, "llr_stats": { "count": 174, "avg_abs": 1.595277, "min_abs": 0.001058, "max_abs": 4.048874, "positive": 36, "negative": 138, "zero": 0 }, "source_rank_score": 106.381108, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "c481def080ab9cb5", "codeword174_sha256_16": "47ebcc4bfd1fb637" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "transform": "lsb_within_each_tone+no_interleaver", "mapping_meta": { "tone_mapping": "lsb_within_each_tone", "interleaver": "none" }, "bit_count": 174, "hard_weight_174": 38, "llr_stats": { "count": 174, "avg_abs": 1.887501, "min_abs": 0.018857, "max_abs": 4.292074, "positive": 143, "negative": 31, "zero": 0 }, "source_rank_score": 107.550004, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "937823f97ed0847f", "codeword174_sha256_16": "9e5b66bac1556b29" }, { "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": 138, "llr_stats": { "count": 174, "avg_abs": 1.609717, "min_abs": 0.003224, "max_abs": 4.292074, "positive": 31, "negative": 143, "zero": 0 }, "source_rank_score": 106.438868, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "46cc6ddc9712ac68", "codeword174_sha256_16": "4235701b167d47ee" }, { "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+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": 138, "llr_stats": { "count": 174, "avg_abs": 1.585003, "min_abs": 8.3e-05, "max_abs": 4.292074, "positive": 33, "negative": 141, "zero": 0 }, "source_rank_score": 106.340012, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "46cc6ddc9712ac68", "codeword174_sha256_16": "4235701b167d47ee" }, { "variant": "lab_mask_xor_preview", "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": 90, "llr_stats": { "count": 174, "avg_abs": 1.644885, "min_abs": 0.001088, "max_abs": 4.048874, "positive": 40, "negative": 134, "zero": 0 }, "source_rank_score": 98.57954, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "2a5e5b0263df5195", "codeword174_sha256_16": "4f91b6dc101564e5" } ], "warnings": [ "Step 51 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 51 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 51 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 51 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": 41, "offsets": { "start_offset_s": 0.06, "base_freq_offset_hz": 3.0, "tone_spacing_offset_hz": -0.03 }, "anchor_applied": { "start_seconds": 4.859999999999999, "base_freq_hz": 1028.0, "tone_spacing_hz": 1.9079844961240309, "nsps": 6192 }, "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": 58320, "start_seconds": 4.86, "base_freq_hz": 1028.0, "tone_spacing_hz": 1.9079844961240309, "nsps": 6192, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step51_source_aligned_timing_sweep:41" }, "best_row": { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "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": 54, "llr_stats": { "count": 174, "avg_abs": 1.071337, "min_abs": 0.008389, "max_abs": 4.378399, "positive": 115, "negative": 59, "zero": 0 }, "source_rank_score": 104.285348, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "7db4ad98fe1e49ac", "codeword174_sha256_16": "7761891a2eaf0907" }, "top_rows": [ { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "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": 54, "llr_stats": { "count": 174, "avg_abs": 1.071337, "min_abs": 0.008389, "max_abs": 4.378399, "positive": 115, "negative": 59, "zero": 0 }, "source_rank_score": 104.285348, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "7db4ad98fe1e49ac", "codeword174_sha256_16": "7761891a2eaf0907" }, { "variant": "mapped_ft8_gray_alt_high_demap_msb_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": 54, "llr_stats": { "count": 174, "avg_abs": 1.152765, "min_abs": 0.002806, "max_abs": 4.378399, "positive": 124, "negative": 50, "zero": 0 }, "source_rank_score": 104.61106, "syndrome_weight": 28, "valid_codeword_hard_decision": false, "message91_sha256_16": "7db4ad98fe1e49ac", "codeword174_sha256_16": "e0bef0ec308e802c" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_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": 59, "llr_stats": { "count": 174, "avg_abs": 0.944583, "min_abs": 0.000269, "max_abs": 3.784521, "positive": 114, "negative": 60, "zero": 0 }, "source_rank_score": 103.778332, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "9f88e54e8b6a8ee7", "codeword174_sha256_16": "d7384dff1531e25f" }, { "variant": "lab_mask_xor_preview", "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": 85, "llr_stats": { "count": 174, "avg_abs": 2.042063, "min_abs": 0.027988, "max_abs": 4.378399, "positive": 41, "negative": 133, "zero": 0 }, "source_rank_score": 100.168252, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "b66ebffa64074608", "codeword174_sha256_16": "43e29a9a3cd43903" }, { "variant": "reverse_symbol_order", "transform": "raw_msb+no_interleaver", "mapping_meta": { "tone_mapping": "raw_msb", "interleaver": "none" }, "bit_count": 174, "hard_weight_174": 42, "llr_stats": { "count": 174, "avg_abs": 2.042063, "min_abs": 0.027988, "max_abs": 4.378399, "positive": 133, "negative": 41, "zero": 0 }, "source_rank_score": 112.168252, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "632654c49dc26f7e", "codeword174_sha256_16": "35185e117fcf4f1a" }, { "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": 42, "llr_stats": { "count": 174, "avg_abs": 2.042063, "min_abs": 0.027988, "max_abs": 4.378399, "positive": 133, "negative": 41, "zero": 0 }, "source_rank_score": 111.168252, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "632654c49dc26f7e", "codeword174_sha256_16": "35185e117fcf4f1a" }, { "variant": "lab_mask_xor_preview", "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": 84, "llr_stats": { "count": 174, "avg_abs": 1.413691, "min_abs": 0.000298, "max_abs": 3.784521, "positive": 119, "negative": 55, "zero": 0 }, "source_rank_score": 97.654764, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "02e61e7bdafc459a", "codeword174_sha256_16": "54ce9719c19c39cc" }, { "variant": "mapped_ft8_gray_alt_high_demap_msb_input+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": 133, "llr_stats": { "count": 174, "avg_abs": 1.682332, "min_abs": 0.011206, "max_abs": 4.378399, "positive": 41, "negative": 133, "zero": 0 }, "source_rank_score": 106.729328, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "39a87ca136a11c0a", "codeword174_sha256_16": "f1661db6a28115ad" } ], "warnings": [ "Step 51 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 51 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 51 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 51 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": 14, "offsets": { "start_offset_s": 0.0, "base_freq_offset_hz": 3.5, "tone_spacing_offset_hz": -0.03 }, "anchor_applied": { "start_seconds": 4.8, "base_freq_hz": 1028.5, "tone_spacing_hz": 1.9079844961240309, "nsps": 6192 }, "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": 57600, "start_seconds": 4.8, "base_freq_hz": 1028.5, "tone_spacing_hz": 1.9079844961240309, "nsps": 6192, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step51_source_aligned_timing_sweep:14" }, "best_row": { "variant": "lab_mask_xor_preview", "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": 84, "llr_stats": { "count": 174, "avg_abs": 1.811424, "min_abs": 0.004549, "max_abs": 4.160775, "positive": 28, "negative": 146, "zero": 0 }, "source_rank_score": 99.245696, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "6d4c90342d0cd9cf", "codeword174_sha256_16": "fcc1684905e18849" }, "top_rows": [ { "variant": "lab_mask_xor_preview", "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": 84, "llr_stats": { "count": 174, "avg_abs": 1.811424, "min_abs": 0.004549, "max_abs": 4.160775, "positive": 28, "negative": 146, "zero": 0 }, "source_rank_score": 99.245696, "syndrome_weight": 26, "valid_codeword_hard_decision": false, "message91_sha256_16": "6d4c90342d0cd9cf", "codeword174_sha256_16": "fcc1684905e18849" }, { "variant": "mapped_lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "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": 46, "llr_stats": { "count": 174, "avg_abs": 1.577969, "min_abs": 0.032989, "max_abs": 4.160775, "positive": 132, "negative": 42, "zero": 0 }, "source_rank_score": 106.311876, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "0d245b70feba1bf6", "codeword174_sha256_16": "f1b0e4aa08c03e19" }, { "variant": "raw_msb_symbol_order", "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": 129, "llr_stats": { "count": 174, "avg_abs": 1.528267, "min_abs": 0.00871, "max_abs": 3.91927, "positive": 45, "negative": 129, "zero": 0 }, "source_rank_score": 124.113068, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "a1a97b2eec802f24", "codeword174_sha256_16": "5836d586f9603ce6" }, { "variant": "raw_msb_symbol_order", "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": 129, "llr_stats": { "count": 174, "avg_abs": 1.485923, "min_abs": 0.004549, "max_abs": 3.91927, "positive": 44, "negative": 130, "zero": 0 }, "source_rank_score": 123.943692, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "a1a97b2eec802f24", "codeword174_sha256_16": "5836d586f9603ce6" }, { "variant": "lsb_within_each_tone", "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": 129, "llr_stats": { "count": 174, "avg_abs": 1.853768, "min_abs": 0.00871, "max_abs": 4.160775, "positive": 29, "negative": 145, "zero": 0 }, "source_rank_score": 117.415072, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "a1a97b2eec802f24", "codeword174_sha256_16": "5836d586f9603ce6" }, { "variant": "lsb_within_each_tone", "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": 129, "llr_stats": { "count": 174, "avg_abs": 1.811424, "min_abs": 0.004549, "max_abs": 4.160775, "positive": 28, "negative": 146, "zero": 0 }, "source_rank_score": 117.245696, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "a1a97b2eec802f24", "codeword174_sha256_16": "5836d586f9603ce6" }, { "variant": "mapped_ft8_gray_primary_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "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": 129, "llr_stats": { "count": 174, "avg_abs": 1.528267, "min_abs": 0.00871, "max_abs": 3.91927, "positive": 45, "negative": 129, "zero": 0 }, "source_rank_score": 106.113068, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "a1a97b2eec802f24", "codeword174_sha256_16": "5836d586f9603ce6" }, { "variant": "mapped_ft8_gray_primary_demap_lsb_input+ft8_bitrev_interleave_codeword_to_rx_inverse", "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": 129, "llr_stats": { "count": 174, "avg_abs": 1.528267, "min_abs": 0.00871, "max_abs": 3.91927, "positive": 45, "negative": 129, "zero": 0 }, "source_rank_score": 106.113068, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "a1a97b2eec802f24", "codeword174_sha256_16": "5836d586f9603ce6" } ], "warnings": [ "Step 51 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 51 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 51 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 51 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": 37, "offsets": { "start_offset_s": 0.06, "base_freq_offset_hz": 2.5, "tone_spacing_offset_hz": 0.0 }, "anchor_applied": { "start_seconds": 4.859999999999999, "base_freq_hz": 1027.5, "tone_spacing_hz": 1.937984496124031, "nsps": 6192 }, "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": 58320, "start_seconds": 4.86, "base_freq_hz": 1027.5, "tone_spacing_hz": 1.937984496124031, "nsps": 6192, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step51_source_aligned_timing_sweep:37" }, "best_row": { "variant": "mapped_raw_msb+ft8_bitrev_deinterleave_rx_to_codeword", "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": 2.228872, "min_abs": 0.041868, "max_abs": 4.18324, "positive": 141, "negative": 33, "zero": 0 }, "source_rank_score": 108.915488, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "0259bb98617eb22e", "codeword174_sha256_16": "6c1338e037549e54" }, "top_rows": [ { "variant": "mapped_raw_msb+ft8_bitrev_deinterleave_rx_to_codeword", "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": 2.228872, "min_abs": 0.041868, "max_abs": 4.18324, "positive": 141, "negative": 33, "zero": 0 }, "source_rank_score": 108.915488, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "0259bb98617eb22e", "codeword174_sha256_16": "6c1338e037549e54" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+no_interleaver", "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": 120, "llr_stats": { "count": 174, "avg_abs": 1.206909, "min_abs": 9.8e-05, "max_abs": 3.852127, "positive": 54, "negative": 120, "zero": 0 }, "source_rank_score": 104.827636, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "8f42609d6f1fc182", "codeword174_sha256_16": "45fb5a75f115763f" }, { "variant": "mapped_ft8_gray_primary_demap_lsb_input+no_interleaver", "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": 120, "llr_stats": { "count": 174, "avg_abs": 1.189499, "min_abs": 0.000127, "max_abs": 3.852127, "positive": 50, "negative": 124, "zero": 0 }, "source_rank_score": 104.757996, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "8f42609d6f1fc182", "codeword174_sha256_16": "45fb5a75f115763f" }, { "variant": "mapped_lsb_within_each_tone+ft8_bitrev_deinterleave_rx_to_codeword", "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": 45, "llr_stats": { "count": 174, "avg_abs": 1.624396, "min_abs": 0.028992, "max_abs": 4.045437, "positive": 129, "negative": 45, "zero": 0 }, "source_rank_score": 106.497584, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "6f3b78f2a0789ec1", "codeword174_sha256_16": "10fa5f26d7f3c832" }, { "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": 125, "llr_stats": { "count": 174, "avg_abs": 1.365276, "min_abs": 0.001421, "max_abs": 4.076297, "positive": 44, "negative": 130, "zero": 0 }, "source_rank_score": 105.461104, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "50ee3ebb2853f49e", "codeword174_sha256_16": "d12d6e7fd563854d" }, { "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": 125, "llr_stats": { "count": 174, "avg_abs": 1.324012, "min_abs": 0.005023, "max_abs": 4.076297, "positive": 49, "negative": 125, "zero": 0 }, "source_rank_score": 105.296048, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "50ee3ebb2853f49e", "codeword174_sha256_16": "d12d6e7fd563854d" }, { "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": 1.718599, "min_abs": 0.017042, "max_abs": 4.076297, "positive": 47, "negative": 127, "zero": 0 }, "source_rank_score": 106.874396, "syndrome_weight": 32, "valid_codeword_hard_decision": false, "message91_sha256_16": "765c4ebc3707fdb0", "codeword174_sha256_16": "1fe0c66a7e9cf192" }, { "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": 48, "llr_stats": { "count": 174, "avg_abs": 1.674076, "min_abs": 0.017042, "max_abs": 4.18324, "positive": 127, "negative": 47, "zero": 0 }, "source_rank_score": 106.696304, "syndrome_weight": 32, "valid_codeword_hard_decision": false, "message91_sha256_16": "6057dbf97536ae1a", "codeword174_sha256_16": "0cbeded997791328" } ], "warnings": [ "Step 51 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 51 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 51 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 51 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": 0.0, "base_freq_offset_hz": 2.0, "tone_spacing_offset_hz": 0.03 }, "anchor_applied": { "start_seconds": 4.8, "base_freq_hz": 1027.0, "tone_spacing_hz": 1.967984496124031, "nsps": 6192 }, "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": 57600, "start_seconds": 4.8, "base_freq_hz": 1027.0, "tone_spacing_hz": 1.967984496124031, "nsps": 6192, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step51_source_aligned_timing_sweep:6" }, "best_row": { "variant": "mapped_lsb_within_each_tone+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": 41, "llr_stats": { "count": 174, "avg_abs": 1.742956, "min_abs": 0.016767, "max_abs": 4.307136, "positive": 132, "negative": 42, "zero": 0 }, "source_rank_score": 106.971824, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "04a04a473d9f4b8a", "codeword174_sha256_16": "bb9158f6426e5474" }, "top_rows": [ { "variant": "mapped_lsb_within_each_tone+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": 41, "llr_stats": { "count": 174, "avg_abs": 1.742956, "min_abs": 0.016767, "max_abs": 4.307136, "positive": 132, "negative": 42, "zero": 0 }, "source_rank_score": 106.971824, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "04a04a473d9f4b8a", "codeword174_sha256_16": "bb9158f6426e5474" }, { "variant": "reverse_symbol_order", "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": 142, "llr_stats": { "count": 174, "avg_abs": 2.244529, "min_abs": 0.061415, "max_abs": 4.307136, "positive": 35, "negative": 139, "zero": 0 }, "source_rank_score": 112.978116, "syndrome_weight": 28, "valid_codeword_hard_decision": false, "message91_sha256_16": "4f116d0d2d97efad", "codeword174_sha256_16": "1ee0e2fbd4d51be6" }, { "variant": "reverse_full_bitstream", "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": 142, "llr_stats": { "count": 174, "avg_abs": 2.244529, "min_abs": 0.061415, "max_abs": 4.307136, "positive": 35, "negative": 139, "zero": 0 }, "source_rank_score": 111.978116, "syndrome_weight": 28, "valid_codeword_hard_decision": false, "message91_sha256_16": "4f116d0d2d97efad", "codeword174_sha256_16": "1ee0e2fbd4d51be6" }, { "variant": "mapped_ft8_gray_primary_demap_msb_input+ft8_bitrev_deinterleave_rx_to_codeword", "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": 37, "llr_stats": { "count": 174, "avg_abs": 1.902489, "min_abs": 0.041499, "max_abs": 4.063879, "positive": 137, "negative": 37, "zero": 0 }, "source_rank_score": 107.609956, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "5e2bcbbdc8cb3e2a", "codeword174_sha256_16": "ac458b913c953919" }, { "variant": "mapped_ft8_gray_primary_demap_msb_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": 137, "llr_stats": { "count": 174, "avg_abs": 1.902489, "min_abs": 0.041499, "max_abs": 4.063879, "positive": 37, "negative": 137, "zero": 0 }, "source_rank_score": 107.609956, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "5d363667677b4ebf", "codeword174_sha256_16": "5f395d3ae3d410f8" }, { "variant": "mapped_ft8_gray_primary_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "transform": "ft8_gray_primary_demap_msb_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": false, "interleaver": "ft8_bitrev", "direction": "interleave_codeword_to_rx_inverse", "order_len": 174, "polarity": "inverted" }, "bit_count": 174, "hard_weight_174": 117, "llr_stats": { "count": 174, "avg_abs": 1.217101, "min_abs": 0.010473, "max_abs": 4.109301, "positive": 55, "negative": 119, "zero": 0 }, "source_rank_score": 104.868404, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "00e0e71440a516c6", "codeword174_sha256_16": "6f3fc74324df2743" }, { "variant": "mapped_ft8_gray_alt_high_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "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": 1.165809, "min_abs": 0.003322, "max_abs": 4.109301, "positive": 58, "negative": 116, "zero": 0 }, "source_rank_score": 104.663236, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "aca78234d03d9e6e", "codeword174_sha256_16": "545b323981ac1f0b" }, { "variant": "raw_msb_symbol_order", "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": 142, "llr_stats": { "count": 174, "avg_abs": 2.244529, "min_abs": 0.061415, "max_abs": 4.307136, "positive": 35, "negative": 139, "zero": 0 }, "source_rank_score": 126.978116, "syndrome_weight": 32, "valid_codeword_hard_decision": false, "message91_sha256_16": "56db10214087a30c", "codeword174_sha256_16": "04161507fe78a98a" } ], "warnings": [ "Step 51 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 51 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 51 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 51 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": 26, "offsets": { "start_offset_s": 0.03, "base_freq_offset_hz": 3.0, "tone_spacing_offset_hz": -0.03 }, "anchor_applied": { "start_seconds": 4.83, "base_freq_hz": 1028.0, "tone_spacing_hz": 1.9079844961240309, "nsps": 6192 }, "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": 57960, "start_seconds": 4.83, "base_freq_hz": 1028.0, "tone_spacing_hz": 1.9079844961240309, "nsps": 6192, "candidate_score": null, "costas_hits": null, "avg_margin_db": null, "anchor_source": "step51_source_aligned_timing_sweep:26" }, "best_row": { "variant": "mapped_lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "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": 37, "llr_stats": { "count": 174, "avg_abs": 1.730043, "min_abs": 0.021616, "max_abs": 4.058353, "positive": 138, "negative": 36, "zero": 0 }, "source_rank_score": 106.920172, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "b85913e71a6e72e1", "codeword174_sha256_16": "e86c99d44140da4f" }, "top_rows": [ { "variant": "mapped_lsb_within_each_tone+ft8_bitrev_interleave_codeword_to_rx_inverse", "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": 37, "llr_stats": { "count": 174, "avg_abs": 1.730043, "min_abs": 0.021616, "max_abs": 4.058353, "positive": 138, "negative": 36, "zero": 0 }, "source_rank_score": 106.920172, "syndrome_weight": 27, "valid_codeword_hard_decision": false, "message91_sha256_16": "b85913e71a6e72e1", "codeword174_sha256_16": "e86c99d44140da4f" }, { "variant": "mapped_ft8_gray_primary_demap_lsb_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": 109, "llr_stats": { "count": 174, "avg_abs": 0.947826, "min_abs": 0.000717, "max_abs": 3.411851, "positive": 68, "negative": 106, "zero": 0 }, "source_rank_score": 103.791304, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "63d7de999dc28356", "codeword174_sha256_16": "2ad9b1a14cd85e5c" }, { "variant": "lab_mask_xor_preview", "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": 89, "llr_stats": { "count": 174, "avg_abs": 1.857069, "min_abs": 0.01092, "max_abs": 4.006713, "positive": 36, "negative": 138, "zero": 0 }, "source_rank_score": 99.428276, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "f3209b00dbbed253", "codeword174_sha256_16": "135a8970b67957e7" }, { "variant": "lab_mask_xor_preview", "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": 81, "llr_stats": { "count": 174, "avg_abs": 1.51869, "min_abs": 0.01092, "max_abs": 3.732172, "positive": 123, "negative": 51, "zero": 0 }, "source_rank_score": 98.07476, "syndrome_weight": 29, "valid_codeword_hard_decision": false, "message91_sha256_16": "4dc8b43767d57817", "codeword174_sha256_16": "78617f41a52a8853" }, { "variant": "mapped_lsb_within_each_tone+ft8_bitrev_deinterleave_rx_to_codeword", "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": 130, "llr_stats": { "count": 174, "avg_abs": 1.736354, "min_abs": 0.024218, "max_abs": 4.151228, "positive": 45, "negative": 129, "zero": 0 }, "source_rank_score": 106.945416, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "b514dccc3f8f2f30", "codeword174_sha256_16": "e7b301d31e50e275" }, { "variant": "mapped_lsb_within_each_tone+ft8_bitrev_deinterleave_rx_to_codeword", "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": 130, "llr_stats": { "count": 174, "avg_abs": 1.686625, "min_abs": 0.011664, "max_abs": 4.151228, "positive": 46, "negative": 128, "zero": 0 }, "source_rank_score": 106.7465, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "b514dccc3f8f2f30", "codeword174_sha256_16": "e7b301d31e50e275" }, { "variant": "mapped_ft8_gray_primary_demap_lsb_input+ft8_bitrev_deinterleave_rx_to_codeword", "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": 126, "llr_stats": { "count": 174, "avg_abs": 1.567434, "min_abs": 0.000989, "max_abs": 3.732172, "positive": 51, "negative": 123, "zero": 0 }, "source_rank_score": 106.269736, "syndrome_weight": 30, "valid_codeword_hard_decision": false, "message91_sha256_16": "810a0472f0698b8d", "codeword174_sha256_16": "4316a723d47fd8eb" }, { "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": 129, "llr_stats": { "count": 174, "avg_abs": 1.34105, "min_abs": 0.01092, "max_abs": 4.006713, "positive": 42, "negative": 132, "zero": 0 }, "source_rank_score": 105.3642, "syndrome_weight": 31, "valid_codeword_hard_decision": false, "message91_sha256_16": "9b97c830c0ad11f6", "codeword174_sha256_16": "06400af302ea8869" } ], "warnings": [ "Step 51 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 51 profile-anchor guard: FEC symbols were extracted from the selected profile sync anchor instead of re-running an independent sync search.", "Step 51 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 51 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/step51_source_aligned_timing_boundary_sweep.json", "timing_best_candidate_json": "/decoders/js8_decoder/runtime/timing_boundary_sweep/step51_source_aligned_best_timing_fec_candidate.json", "checkpoint_json": "/decoders/js8_decoder/logs/20260527T110128Z_real_run_timing_boundary_sweep_output.json" }, "decodes": [], "warnings": [ "Step 51 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." }