All, Received an email regarding MT63 decode problems with Fldigi. It seems that the program chooses the short interleave setting by default. This is not compatible with the long-interleave 'standard' used by the majority of MT63 users.
To correct this, click configure / modems and then the MT63 tab. Check the 64 bit interleave box. This will solve the problem. Fldigi's MT63 decode capability seems identical to IZ8BLY's. Tony, K2MO
