Well, it looks like my KX3 has developed a new problem. I'm not sure how, when, or why this occurred, but I now have no RX with the rig. There is no noise received, no deflection on the S-meter, and it barely detects a signal when I TX a few watts CW from the K3 sitting right next to it. I tried all the usual firmware reload tricks, but a support ticket with Elecraft has resulted in the rig going in for service. So, off it goes...I'll report back on the findings.