Hi Tom, The "LVB Tracker Box" designed by Howard Long has a very good reputation and will work well with SatPC32 and other software. It is available in kit form in various options or ready built from Amsat. It also has either a serial port or USB port option. You will need to download a driver for the USB version from the site mentioned in the intructions. Both the Amsat NA and Amsat -UK have published information about its use in their journals and web pages. Good Luck Ken Eaton GW1FKY Amsat -UK Amsat NA