Abstract: Apparatus for displaying operating conditions of a device in which voltages that are produced when respective operating conditions exist are formed into a series of pulses with a bracket pulse on at least one end of the series and a display of indications of the presence of pulses at locations corresponding to their positions in the series.

Abstract: A module for use with a radial combiner comprised of a compartment on one side of a base that contains a plurality of amplifiers located on a printed circuit board having conductive patterns respectively coupling the amplifiers between points along a serial splitter and points along a serial combiner in which operating potential for the amplifiers is derived from storage capacitors connected between two conductors on a separate board via conductive spring fingers having one end attached to one of said conductors and the other end bearing against a conductive pad on the printed circuit board that is coupled to an electrode of an amplifier and in which a plenum is mounted along one edge of the module for conducting cooling air to a duct on the other side of the base.