Yo, You want to use matched diodes with low forward drop. If I were making an RF mixer, I'd use a HSMS-282R. Here is the data sheet: http://literature.agilent.com/litweb/pdf/5968-8014E.pdf They show a ring mixer app. --TR __________________________________________________ Do You Yahoo!? Yahoo! Autos - Get free new car price quotes http://autos.yahoo.com