For some reason I can't find the answer to, my K3S won't go in to TX when in RTTY. It does for FT8 and all other modes but when it comes to FSK the PTT is inhibited for some reason. When in TX Data mode for RTTY I press the XMT button and I get N/A on the display. I'm sure it's some setting but which one? Pete, W1RM W1RM at Comcast.net