Flex 6500 multi-flex V3 software and WSJTX

Hi Rick, yes to question 1 and "sort of" on question 2. The 6500 has one Spectral Capture Unit (SCU), so that means both have to share a receiving antenna. So while one transmits, the other can't hear. So if this is for casual operation with each station taking turns (and a way to coordinate with one another), it may be perfectly adequate. If this is a contest situation with one station running a freq and the other hunting multipliers, it could also work, but will still require good coordination and is limited by the single SCU. If this is for two contesters to operate independently, then I don't think you would be happy with this setup. What really does not work, is monitoring the other station by listening to the radio.

If you have a 6600 or 6700 with two SCUs, then by careful separation of antennas, one can listen while the other transmits, especially if it is on a different band (same band may or may not work depending on antenna proximity and power levels). There is still just one transmitter, so coordination is necessary in this case as well.

Cool, I am glad that will work! Since you will be using MultiFlex, each station will only see their own slice, not the other's. That is not a problem as you both just put your slice on the same frequency.

One outside-the-box thought... My homebrew TeensyMaestro will connect to a radio with two clients already connected using MultiFlex. One side shows one person's slice and the other side shows the other person's slice. The TM can control each slice independently, or lock the two together so that the frequency of one slice is tracked by the other slice, and vice-versa. With a pair of these boxes you would always know where the other guy is tuned, or both be able to move both radios simultaneously.

I haven't played with Node-Red yet, but I would guess that the same thing could be accomplished with the Node-Red software flows on a computer or a Raspberry Pi.