The KX3 was a champ at copying PSK without a computer. I was transmitting at 4 watts and Matt WM4AA was transmitting at 15 watts on his TS590. The picture is what my KX3 signal looks like on his waterfall. He could copy it perfectly. The internal set up of the KX3 in PSK-D mode was not overdriven at all. Sending PSK through the paddle or through the KX3 utility was also a breeze. It is truly amazing what this little rig can do.