I guess the answer to my problem lies somewhere in pack/unpack, but I find them very difficult to understand.

I have this string: "139686DA20C1" which represents 48 bits (6 hex bytes). I know that the first 45 bits are my name, written as 9 x 5 bit chars where 00=A to 1A=Z, but I cannot print them without using 'if' cases for each group of 5 bytes (8 chars)

I also need to be able to generate these strings.

Is this the only solution ?

Many thanks