I made a linx remote control ac/dc light dimmer with the LR linx. Used int RCV but also continously sent out the received character for hyper-term type viewing. The RF module idle state always had random noise (due to high gain in module) which showed up on PC as random junk, but the serial on transmission was clear. That way I could always watch tx/rx interaction.
The int rcv is easy to set up.

don