[Elecraft] K3 Goes to TX on Turn ON

[paul ecker via Elecraft]

I changed K3 PTT-Key to "OFF-OFF", that seems to have solved TX on turn on problem. But now - not sure if related- K3 will not talk to PC serial port. I have two 2 port serial cards installed my Win 7 64 bit PC. I tried cable from K3 in all four and can't get it to connect. Also cannot get KPA 500 or P3 to talk to serial ports. I tried another serial cable- same problem. KAT 500 using USB connection does interface with PC OK. 

73 Paul
kc2nyu 

Do you have an RS-232 cable connected between the P3 and a PC? If so, then no doubt the PC is asserting RTS or DTR. Either that, or the cable is bad.
Three possible solutions:
- Figure out why the PC is asserting RTS or DTR and change it.
- Change the K3 "PTT-KEY" menu entry to "OFF-OFF".
- Remove the RS-232 cable between the P3 and the PC.
Alan N1AL