character encoding for SQL Server to Oracle linked server
The 193 stored in the Oracle database is not a valid character in the UTF-8 character set. UTF-8 encodes the first 128 characters (0-127) using a single byte but anything beyond 7-bit ASCII requires two or more bytes of storage. Whatever application inserted this data appears to be doing so incorrectly, most likely because it is misconfigured to bypass the character set conversion that is supposed to happen when data is transferred between the client and the database.
What language/ framework/ API is the application that inserted the data into the Oracle database using? What is the client NLS_LANG parameter?