The part of the Digital Pre-Distortion system in the amplifier is only a RF sampler (or attenuator) that provides a very small feedback signal from the amp to the transceiver. All the DPD work appears to be performed in the transmitter. If the input level required by the ICOM transceiver is +10dBm (10mW), DPM could be provided to the LA1K by the ICOM transceiver. DPD appears to be a very slow feedback system that learns the corrections, rather than provides an immediate correction like a normal feedback system. This keeps the feedback system stable because of the long delays inside of the feedback loop would cause instabilities.
Maybe this provides some insight.
73
.... Bill K3HZP
Bill K3HZP