¿ªÔÆÌåÓý

ctrl + shift + ? for shortcuts
© 2025 Groups.io

PTT over CAT - WSJT-X vs fldigi #fldigi #QMXplus #ssb #wsjt-x


 

I just updated to the new SSB firmware on QMX+ Rev. 3 and was hoping to try out MSK144 mode in WSJT-X. (Probably not enough power to be heard by anyone, but still.)
?
I have found the PTT over CAT control to be inconsistent when in USB mode. Usually the first TX works and then the rest briefly trigger then un-trigger PTT. (DIGI mode still works just great.) Looking at the CAT monitor doesn't show anything odd (no early RX; sent) and it's not triggering SWR protection or anything.
?
PTT over CAT in USB mode in fldigi---also using Hamlib, same Kenwood TS-480 config---works fine.
?
As far as I can tell, the only difference is that WSJT-X is sending either 'TX;' or 'TX1;' depending on the configuration; while fldigi is sending 'TX0;' which for some reason is more reliable in convincing the QMX+ to transmit.
?
Is anyone else having this issue? Any suggestions or ways to convince WSJT-X to send 'TX0;' instead?
?
TNX 73 de Tim AF0CQ