RS-232 - so I am going out of the Macbook's USB 3.0 port > USB.3.o to 2.o adapter > USB 2.1 to RS-232 adapter cable > K3 I will try your settings. It has also been suggested to me that I try the CAT control in one of the logging programs made for the Mac. RUMlogNG or MacLoggerDX. I appreciate all your help K7GQ 73 de Eric, KG6MZS PS; last night I worked New Zealand, Australia, New Caledonia and Norfolk Island dodging the bad decodes on the Windows 8 machine. This really makes me want to get on this mode with a stable machine!