Sample input? Expected output?
I usually try to figure this out with real data, something where you know what result you're expecting, along the lines of
$ perl -le " print join q/ /, unpack q/(A4)*/, unpack q/B*/, pack q/B
+33/, 1, 66 "
1000 0000 0000 0000 0000 0000 0000 0000 0000 0000
$ perl -le " print join q/ /, unpack q/(A2)*/, unpack q/H*/, pack q/B3
+3/, 1,66 "
80 00 00 00 00
or maybe
$ perl -le " print join q/ /, unpack q/(A2)*/, unpack q/H*/, pack q/B3
+3/, join q//, 1, unpack q/B32/, 66 "
9b 1b 00 00 00
$ perl -le " print join q/ /, unpack q/(A4)*/, unpack q/B*/, pack q/B3
+3/, join q//, unpack(q/B1/,1), unpack q/B32/, 66 "
1001 1011 0001 1011 0000 0000 0000 0000 0000 0000
or even $ perl -le " print join q/ /, unpack q/(A4)*/, unpack q/B*/, pack q/B3
+3/, join q//, unpack(q/B1/,1), unpack q/B32/, 66 "
0001 1011 0001 1011 0000 0000 0000 0000 0000 0000
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