Iconv UTF-8 to ASCII EXTENDED

Ruby 1.8.6 Rails 2.3.2

The DB is runnig with UTF-8 codification. I need to export some text field from the DB to TXT file for import with another app runnig under DOS (no comments please...). I am having problems exporting texts containing chars like á, ú or é. Here an example os the behaviour:

#code require 'iconv' text = 'aeú' Iconv.new('ascii//translit', 'utf-8').iconv(text) -> Raise an error. Iconv.new('ascii//ignore', 'utf-8').iconv(text) -> 'ae' (ú was truncated)

How can I convert chars (like ú), with ASCII codification greater than 127, correspondig with the EXTENDED ASCII charset ?

Thanks Fabian