For digital modes I am using fldigi on a MacBook and the IC-7300 built-in USB interface. This is my running configuration:
On the IC-7300 press Menu -> Set -> Connectors
ACC/USB AF Output Level to 75%
USB MOD Level to 25%
DATA MOD: USB
Under CI-V CI-V Baud Rate is set to Auto.
CI-V USB Port: Unling from [REMOTE] and
CI-V USB Echo Back: ON
You need to get the IC-7300.xml file written by W1HJK to use the CAT.
After Installation start fldigi and go to
Configure -> Rig ->RigCat
Select the downloaded xml file. Under Device select “SLAB_USBtoUART” (driver name).
Set Baud rate to 19200.
Tick CAT command for PTT
Audio Port: Audio USB Audio CODEC
The “sweet spot” for the IC-7300 in data mode is 1500 Hz.
Configure -> Misc -> Sweet Spot PSK et al.: 1500
Reduce the output power to 20% … 35%. When you click on “Tune”, ALC should be at zero. In my station setup I can “hear” the computer on 15 m. Levels vary depending on the USB connection cable. I still need to experiment with some ferrite to reduce interference.
The same configuration can be used for JT-65 (WSJT-X). I changed the IC-7300 CI-V address to 88h and select IC-7100 as transceiver.