JS8call works now ... it was only bad reception. But the error when putting presets for ham radio in the terminal before I start JS8call or WSJTx is already present. Bought my KX3 from a HAM how sold his equipment and the cable from hammadeparts.
rigctld-wsjtx -m 2045 -r /dev/ttyUSB0 -s 38400 -P GPIO -p 12
pi@pi:~ $ ls /dev/ttyUSB*
Thanks for your support
73 de Erwin, OE1EKG