All this talk about FT-8 has prompted me to give it a try. I downloaded WSJT-X 1.8 and have it installed using the Flex 6xxx rig protocol, Network server 127.0.0.1:60001 (I created that CAT port), and PTT set to CAT on the default & grayed out setting of COM4. The program tracks the receiver, I can decode signals, and 'Test CAT' shows 'green'. However, 'Test PTT' is grayed out, and the 6500 does not switch into transmit. What other settings am I missing??