I’m starting this thread over. It ended up on a FT891 thread after I asked a question about how someone was successful getting an FT891 to work with the Digrig.
This is an unusual situation since the FT991 has a USB port that serves as both CAT, sound card and audio port. Unfortunately, some time ago I lost that port when I believe that I was hit with a lightning strike.
So I decided to try the Digrig with the FT991 using the other existing ports (RS232 and RTTY/Data ports). The RS232 port works fine with a direct cable to my computer for CAT and PTT (but couldn’t get CAT to work through the Digrig with the RS232 cable). Now trying to just use it for the audio input/output with FT8. It works fine with a Signalink and a cable for my FT857 rig, so I know the output/inputs are okay.
The confusing thing is by trial and error settings I had it receiving and PTT was working. I got it to transmit twice and then the audio went out. I’ve had this problem before on 40 meters due to RF feedback with the Signalink. It locks up the audio on my computer. By rebooting the computer I can get it back and if I keep my power output low enough I can prevent it from reoccurring on the Signalink.
However, now I can’t get either input or output to work through the Digrig. I’m trying it with FT8 settings and rig settings but can’t find a combination that works again.