Chuck, Just so happens that I tried out my K1EL keyer with DXB2K5 last night and it worked FB. Did you make sure that in DXB CW keyer set up options you selected the correct com port and that you have the pin 5 choice set to PTT or Tone? Also, check the com port baud rate is set to 1200 N-8-1 and the address is set correctly. DXB expects COM 1 to be at 3F8. Dale AA1QD