am pm conversion
AM/PM is easy. Hook the beast to a vector network analyzer, with some means to monitor output power (directional coupler and power meter between output and netwrk analyzer). Set output power to 5 dBm, read phase, increase output power to 6 dBm, read phase. If the phase difference is < 4 degrees, you are in-spec. Now redo with power at 6 dBm, increase to 7 dbm, is phase difference is <4 dBm...repeat until you are at 34 dBm. You will find the most trouble around the 1dB compression point.
As to the AM/AM, they are talking about how much the gain compresses vs output power. Not quite sure what the % means though.