Having trouble creating point to point network using two Xtend XTP9B-PKU-NA

I’m trying to use two XPT9B-PKU-NA modules to send mavlink commands over the air to a UAV, using one module as a ground station and putting the other module on the drone. I know my wiring is right but I can’t seem to get them to communicate. I must be overlooking something. Could someone help with an example configuration and tell me what things I need to change specific to my device?