Hi Mark -?
Chasing down a similar (same) problem over here -?
[email protected] | Arduino, PC, Serial Communications / CATWhat platform are you running WSKTX on Windows or Linux???
If you don't already know about it there is a command line program in the Hamlib distribution called "rigctl"? I find it very useful - in it's verbose debug mode it shows you every byte it sends and receives.? ? My observations is that it thinks it is sending but nothing arrives at the Arduino - unless I open and close the Arduino IDE serial monitor before running the program - then it all works fine - including WSJTX (with DTR un-checked).
I am Interested in collaborating on this - it would be good to get Arduino / Hamlib communications to be reliable.
73,
Dean
