Abstract: The invention is directed to a system and process operating on an air-standard cycle either to cool or heat a room. The system may be advantageously employed to cool or heat relatively small areas or rooms, particularly driver's cabins in locomotives and the like. In cooling operation, outside air is expanded in a turbine, cooled below ambient, and introducted into a heat exchanger. Air from the room to be cooled is introduced into the heat exchanger and heat is removed therefrom. Suitable valves are provided to change the operation of the heat exchanger to that of a regenerator and to direct the flow of air accordingly. Specifically, air heated by compression in the compressor is directly introduced into the room and air leaving the room is passed through the regenerator/heat exchanger and released into the atmosphere.

Abstract: Described is a transformer wherein the primary winding is formed from the same unitary piece of electrically conductive metal that comprises the housing of the transformer.

Abstract: Described is a transformer having a two-piece primary winding and housing wherein the second piece is mechanically received within the first piece and electrically coupled together.

Abstract: Provided is a modulator having two amplifying stages for supplying high-voltage pulses to the primary winding of a transformer connected to a microwave transmitter tube. The first stage uses field-effect transistors connected in a common source configuration to amplify input pulses to drive the second stage, which uses field-effect transistors connected in a common gate configuration to drive the transformer. The circuit configuration provides a large voltage swing across the transformer primary and a short transistor switching time.

Abstract: A method for packaging components in the primary circuit of a microwave tube modulator output transformer. Modules are assembled using parallel plates upon and around which transistors and other necessary components are mounted. In addition to providing mechanical support for the components, the plates act as conductors for circuits common to respective elements of paralleled transistors, thereby minimizing electrical resistance and inductance in the primary circuit. The modules are designed to mount to the output transformer such that two of the parallel plates are mechanically connected to the respective two ends of the transformer primary, and a number of modules can be mounted around and to one transformer according to the amount of energy required.

Abstract: An air cycle air conditioning system has an air expansion turbine arranged to deliver air through an outlet formed by a wall having an outer surface that defines in part passage means through which supply air flows to the turbine. Heat flow from the supply air into the wall prevents formation of ice in the outlet so that in at least one phase of system operation the turbine delivers air at sub-zero temperature with which large quantities of augmenting air can be mixed so as to increase the system cooling capacity.