AKG Antenna supply unit for long antenna cab AKG-ASU 4000 N REMOTE DC POWER for RA4000 B/W, SRA2 B/W antennas and AB4000 booster The ASU4000 is a remote antenna power supply unit for large-scale antenna distribution or small antenna systems where no PS4000 W is in use. It provides the necessary power for up to three active antenna elements RA4000 B, SRA2 B, AB4000 via the antenna cable.