Loss of PSK and RTTY TX audio on Flex

[Wilson C]

There have been several occurances with at least 3 Flex users (both 8600 and 6600s) of the TX audio disappearing when switching between RTTY and PSK on seperate slices.  This either happens at start up of SDC or at some ramndom time.  The Flex still switches between slices when the appropriate QSO window is selected in SDC and it goes into transmit as expected, but there is no audio on the transmission and nothing on the Smartsdr audio level meter.  This either happens to one or both of the modes.  Restarting SDC or SMartSDR  does not fix the issue.  The only fix I have found is to shut down the DAX program.  I have been unable to reproduce the issue if SmartSDR and SDC are run without DAX running. ( It appears DAX isnt required too run SDC?)

I suspect there is a conflict between the new DAX software and controlling the Flex/SmartSDR via the API but that is just a guess.  

Not sure if this is an SDC issue or a Flex issue so posting in both forums just in case anyone else is seeing this issue.

Wilson - G6ELF

[UT4LW Yuri Pavlov]

Hi Wilson

SDC does not use DAX or CAT.

In which version of SmartSDR did this issue first appear?

I didn't thoroughly test version 4.2.18 because I found several another serious issues and reverted to version 4.1.5.

воскресенье, 3 мая 2026 г. в 18:13:25 UTC+3, wil...@endormoon.co.uk:

[UT4LW Yuri Pavlov]

Try v19.0605

воскресенье, 3 мая 2026 г. в 20:41:51 UTC+3, UT4LW Yuri Pavlov: