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sdrtrunk/src/main/java/io/github/dsheirer
Steve Pinkham 9305abc784 P25 Phase 2: consult I-ISCH 2 when I-ISCH 1 fails to decode (#2458)
SuperFrameFragment.getTimeslotOffset() tests getIISCH1().isValid() twice,
so the second I-ISCH is never consulted and a fragment whose first I-ISCH
does not decode is descrambled at timeslot offset 0.  On a weak signal
the first I-ISCH fails on almost half of the fragments, and two of every
three of those are then descrambled with the wrong phase.  Test I-ISCH 2
as the surrounding code intends (isFinalFragment() already does).

Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
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