Rusty, I have a FT-900CAT and have successfully used the data port for I/O directly to the sound card with just two small coax cables, no transformers, controls or anything else. I was doing PSK31 and set the vox controls on the 900 for T/R switching. That has worked better than anything else that I have tried with homebrew isolation transformers and level controls. Hope this is of interest. 73, Darryl, KK5IB