"Comprises a microwave integrated circuit assembly, waveguide extension, circulator, electronic control module assembly, oscillator voltage regulator, transmit/receive limiter and miscellaneous electronic/hardware components; dimensions are 11.1 inches wide, 5.4 inches high, and 10.5 inches long; forms the upper section of the Line Replaceable Unit (LRU) and provides a mounting surface for receiver circuit modules A1/A2."