[Elecraft] K3 PSK31 split freq?

[cx7tt at 4email.net]

Hello, using K3 #250 here with 3.63 firmware, etc. Today there was a 
V5/DJ on 17m on PSK31. He was calling CQ and listening up. When I tried 
to go split I got a "SPL N/A". I vaguely remember someone recently 
having same issue and I went to the K3 wiki to do a search but could not 
find anything. The K3 will do split for AFSK, FSK and Data A. The manual 
does not mention this, at least not on p36 under SPLIT/Cross mode ops 
nor on page 31 DATA modes. Any way to do split mode in PSK?
What am I missing? Tnx
73
Tom
CX7TT