BA7NNC-JOE My callsign is 891, and I also don't have a built-in sound card. I use the audio input/output line for FT8 to connect to my computer's 3.5mm audio jack, and it works fine with N1MM and SSB as well.
BI3AFQ Anonymous8 After setting DTR CW, the box's speaker was emitting CW, but the radio's PTT didn't output any power.
BI3AFQ The issue has been resolved. After switching the box to CW mode, the rear CW interface is enabled. A cable was missing to connect the box and the radio. Now it's working correctly and I have successfully transmitted a CQ call.