I have been operating a lot with my f3k and its really working well on receive despite intentional qrm from europe. I must confess that I also have a Datong FL3 auto notch filter in-line with the audio side and what a combo! Not much gets through and it makes chasing DX a pleasure. I would never go out and purchase another non rlex transceiver, if I had the money. Has anyone perhaps used the F3K with digital voice and how did the F3K stand up to the continious carrier transmission ?