Thanks for the info. By turning the built-in electronic keyer off DX4WIN started keying the Mark-V. I am using the W1WEF Model 3 parallel port CW keying interface. I think I will just stick with the parallel keying, it seems to work fine. It is funny though, using TR Log, it keys the rig even if the electronic keyer is turned on where DX4WIN will not. Again, thanks for all the help. 73's Alan N5PA