[Elecraft] K3 MMTTY on 30 meters HELP!

[Mike Furrey]

Hi!It must be something simple I am missing but for some reason, I cannot get the K3 to transmit RTTY from MMTTY only on 30 meters. I have checked all settings but nothing. It is fine on 160 - 6 meters (just checked) but on 30, nothing. If I unplug the cables from the computer and use the keyer paddle, all is ok. But plug in the cables and using MMTTY ... NOPE!
What am I missing?
Thanks in advance.
73, Mike WA5POK