Hey folks. After fighting with the Yaesu SCU-17 interface for digital modes and CAT commands, I decided that we need a support group for this little thing. It's a nice piece of equipment that compliments all the newest Yaesu HF gear, but is a total pain in the butt to get going. What I have found out though a lot of trial and error is this: Some software (DigiPan and WinLink) don't see the SCU as a way to operate digital modes from the normal COM ports way of keying up the radio, if that makes sense. Other software like, specifically FLDigi and its associated programs do, but it takes a little work to get it right. FLDigi lets you work both com 3 and com 4 (if that is the com ports it set up) Same for a few other pieces of software. Just make sure your com ports, the radio and the software are all running the same baud rate. Also need to run USB Data DigiPan and Winlink need to be set up to key up the radio though normal USB voice, BUT you must tell the radio to be in VOX. The FT-1200 has a selection for that and I assume that the others do as well. With both ways, you will need to tinker with the audio in and out settings on the SCU-17 and the computer. I only know Windows 7 with this but I would guess that other flavors of operating systems are fairly similar. Please, if you have any questions about the SCU-17 and set up or can offer other advice, post it here. Lots of people are buying it, but Yaesu seems to not want to offer support outside of initial setup.