For thos with new ID-51A handhelds, here are the menu settings for D-RATS. I believe they will be the sam for the 31A, but someone please verify as I don't have a 31A.
GPS>GPS TX Mode = OFF, GPS>GPS Auto TX = OFF, DV Set>DV Data TX = Auto
By the way, I am using the RT Systems USB-RTS05 cable as the shell of the 2.5mm plug is very slim and fits completely in the data jack.
John WB4QDX