I think I have it working, but haven't heard any signals or tried to contact anyone yet. What works is that if I punch CONNECT the transmitter gets keyed and I can hear signal bursts going out on the sidetone. And I guess I am receiving audio because I'm getting a bunch of garbage on the screen with noise input.
Is there a procedure for calling CQ? Or do you have to have a definite call sign you want to connect to? I assume that's what goes in the box that by default contains GTORTOCALL