Welcome to the new FlexRadio Community! Please review the new Community Rules and other important new Community information on the Message Board.
If you are having a problem, please refer to the product documentation or check the Help Center for known solutions.
Need technical support from FlexRadio? It's as simple as Creating a HelpDesk ticket.

Low TX audio when using FLDigi on MacOS

minorsecond Member, Unconfirmed ✭✭
edited September 2023 in SmartSDR for Mac

I've gotten FLDigi to mostly work on macOS using Loopback to connect the audio interface, but when I go to transmit, the audio level received by SmartSDR is low and I get just a few watts of TX output, even if I bump up RF Power to 100.

Is there something I'm missing in the chain where I can increase the audio output from FLDigi by chance, or is this just the way things are?



  • K3SF
    K3SF Member ✭✭✭

    can adjust gain in loopback

    see my loop-back to send data stream to fldigi

    you will see i have multiple fldigi versions in loopback...i did that cause if there is an issue with the current fldigi i an easily fall back a version

    also loopback is one place to increase gain for transmit

    hope this helps

    Paul K3SF

  • cdhowe
    cdhowe Member
    If after adjusting all your loopback gains to 100%, and you still don't have sufficient audio (a situation which I ran into in my shack), download the program the xDAX helper program from


    It has yet another volume control for the transmit channel that can boost the audio past what Loopback will do.

    Carl WG1V