Issue the ASCII command before transferring it on the sending side. That should force LF->CR/LF conversion (the FTP spec requires CR/LF on the wire). Most Unix FTP clients default to binary mode these days, which is why you get the raw LF.
Question: are these fixed length records? If so, try SITE FIX nnn, and the FTP client will segment the records into nice neat fixed-length chunks properly.
