I've always had bad luck with these radio modules, but I though I can give it another try.
I have a bunch of PA LNA modules, and one or two simple ones. But none of them is working properly.
I can connect for example a pa lna to my arduino pro mini, or the nano, I upload the pingpair_ack sketch, and it does nothing. It prints out real informations but then it freezes, and does nothing. The arduino accidentally processes the serial buffer, but cannot change role (the same applies to the getting started sketch of the library).
If I remove the serial module, and start the arduino it gives false informations, but it "works" the normal way.
I power the whole system (arduino and radio chip) of a single usb port on my machine. Could it be a problem?