Communications & Power Industries. Communications & Power Industries (CPI) provides microwave, radio frequency (RF), power and control solutions for defense, communications, medical, scientific and industrial applications. Products include: VEDs, klystrons, TWTs, TWTAs, CFAs, satcom amplifiers, HPAs, SSPAs, LNAs, LNBs, power grid devices, advanced antenna systems, BUCs, solid-state devices, IMAs, EIKs, magnetrons, gyrotrons, medical x-ray generators, medical digital imaging systems, telemetry systems, radomes, transmitters, microwave switches, RF decks, receiver protectors, pressure windows, helix devices, coupled cavity devices