Something that may be relevant was that I found that my QMX+ needed to have the Rise Threshold reduced to 60 to start transmitting. I then found that it would only transmit for a few seconds. I found that the lower the Fall Threshold the longer the transmission and ended up with a Rise of 60 and Fall of 30.
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Incidentally the current incarnation of WSJT-X will read and report the power output and SWR if these are available in the CAT command set.? It WBN if these (and setting the mode if it isn't already there) were available.
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Chris, G5CTH