User-Name and Clear Text Password configurations

Hi All, I want to send out Authentication Request message with only the "User-Name" and "Password". Moreover i want the password to be clear text. Is it possible to configure the free-radius server for just these requirements? I did configure the username and password in the "users" file but server seems to be looking for a encrypted password and is thus sending back a reject. Any way to configure a username and a clear text password? Thanks in advance, Shiv