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Restrict accepted power levels to the 19 valid WSPR values instead of any 0-60. Require a digit at position 1 or 2 of the trimmed callsign per the WSPR encoding rules. Skip candidates whose sync correlation score falls below a minimum threshold before attempting Fano decode. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>