Fits Digirig-Mobile to my permanently installed Yaesu ft-2000.
Are no isolation transformers needed if I use a USB isolator between computer and interface?
In my experience, that depends on the configuration of the shack or the mobile system. What are the Radio Frequency Interference problems you are experiencing now?
73 Constrainted
Most operators use Digirig without the USB isolator and experience no problems.
Adding a USB isolator will prevent ground loop which can potentially cause audio hum.