character set problem in DB link

I have two databases

DB1 :-
NLS_NCHAR_CHARACTERSET=AL16UTF16
NLS_CHARACTERSET=WE8MSWIN1252

DB2:-
NLS_CHARACTERSET=US7ASCII
NLS_NCHAR_CHARACTERSET=US7ASCII


I created a DB link to DB2 from DB1

Using sqlplus, I logged in the DB1 database from DB1 machine , I executed the query

SELECT state from country@TO_DB2;
C?CERES


Then I logged into the DB2 database from DB1 machine, I executed the query

SELECT state from country

CACERES

Why the character A is replaced by some junk value? I want to use the DB link to access the DB2 database, How to solve this issue?

Thanks in Advance
Kumar

try to set both charset to uniform or US7ASCII :)