Hi Wayne,
Maybe you have sorted this out by now. However here's what I have found with my FT-991A. Note that I am using SSTV on 2 metres FM with a local group, so this might be a bit different for SSB.
Switching to "Data" mode in USB or SSB adds an offset to the frequency. See menu items 64 and 65. I have these set to 1500Hz for use with WSJT-X, which would change the freuqency from the dial by 1500 hertz. It's probably better to just use SSB for slow scan.
Set Menu item 70 to "Rear", and item 71 to "RTS". Your FT-991A will show 2 Com ports in the Windows Device Manager. USe the "Advanced" port for CAT commands, and use the "Standard" port for TX control by switching the RTS line. Menu item 72 defines whether to use the Data Port ur USB cable for the sound input.
I have also set menu item 76 to RTS and 77 to USB. So on 2 metres FM, I can use the micropone to talk normally. Clicking on "TX" in Yoniq or MMSSTV will transmit audio from the radio's internal sound card with the microphone muted.
EDIT: In "Voice" modes, using the CAT TX command will switch the radio to transmit with the microphone active, and not use the sound card / data port. Use the "Standard" com port to send audio from the sound card or data port.
Hope this helps you out,
Regards,
Kevin, VK2YPZ
Maybe you have sorted this out by now. However here's what I have found with my FT-991A. Note that I am using SSTV on 2 metres FM with a local group, so this might be a bit different for SSB.
Switching to "Data" mode in USB or SSB adds an offset to the frequency. See menu items 64 and 65. I have these set to 1500Hz for use with WSJT-X, which would change the freuqency from the dial by 1500 hertz. It's probably better to just use SSB for slow scan.
Set Menu item 70 to "Rear", and item 71 to "RTS". Your FT-991A will show 2 Com ports in the Windows Device Manager. USe the "Advanced" port for CAT commands, and use the "Standard" port for TX control by switching the RTS line. Menu item 72 defines whether to use the Data Port ur USB cable for the sound input.
I have also set menu item 76 to RTS and 77 to USB. So on 2 metres FM, I can use the micropone to talk normally. Clicking on "TX" in Yoniq or MMSSTV will transmit audio from the radio's internal sound card with the microphone muted.
EDIT: In "Voice" modes, using the CAT TX command will switch the radio to transmit with the microphone active, and not use the sound card / data port. Use the "Standard" com port to send audio from the sound card or data port.
Hope this helps you out,
Regards,
Kevin, VK2YPZ