Hi Ed,
Sure -- SatPC32 runs both tracking and tuning just fine. I don't list it in my article (referenced earlier) but other sections of my blog show how I've connected up a G5500 rotator. Having SatPC32 controll both the dopper tuning and the tracking is awesome -- it's a great program, well worth it.
Some Yaesu's need the CAT convertor -- specifically the FT817, FT857, and FT897. You can either do a USB --> Serial convertor, then a Serial --> CAT convertor, or you can use one of the all-in-one cables that go right from USB to CAT. I've used both (one of each for portable) and they work fine.
SatPC32 and Unitrac? Not sure, maybe someone else knows...
73 de Dave KB5WIA / CM88
Nice article. A couple questions: 1- Can one run both tracking (B5400) and tuning with SATPC32? 2- I didn't know that Yaesu needed a CAT converter to RS232. The K3 has a RS232 port so easy to connect. But I will have to get into SATPC32 to see if it will support control of the K3. 3. Does SATPC32 interface with the Unitrac2000.
I am running winXP with a computer that has a com port and USB.
73, Ed - KL7UW, WD2XSH/45