Jon, What you need is a "Resolver-to-Digital Converter". I did a quick internet search and came up with a part at "http://www.fttech.co.uk/ft1604.html". They're quoting +/- 1 arc minute accuracy. Don't know the price. Curt Thompson >---------- >From: fieldsj@coned.com[SMTP:fieldsj@coned.com] >Subject: ATM: analog encoders > ... I have a pair of analog (not digital) synchro encoders... >