Abstract: A reception antenna, applicable to the field of television signal transmission, for picking up signals originating from a stationary satellite which has a paraboloid reflector capable of reflecting signals received and concentrating them in a focal point where a source is arranged for guiding the signals towards a frequency converter. The source and the reflector are located inside a polyhedral housing permeable to electromagnetic waves and its lower surface is designed to be placed horizontally when the receiving antenna is being used, the relative positioning of the source and the reflector with respect to the housing lower surface has a predetermined on-site adjustment originally built in. The relative positioning takes into account the elevation angle corresponding to the position of the targeted satellite.

Abstract: A substrate to be coated moves within a vacuum chamber. A deposition material in particle form is stored in a reservoir closed on its lowermost part by a plate. A cable links the plate to a valve which closes the supply opening of a crucible heated to a temperature for evaporation of the deposition material. A control device using at least one electromagnet allows the plate to pivot and thus to open the valve. A quantity of powder falls into the crucible, then the plate and the valve are returned to closed position. A screen with a mesh having dimensions smaller than those of the deposition material particles in the crucible allows pasage of the vapor only and subsequent deposition onto the substrate. The invention is particularly useful in the manufacture of carbon fibers coated with magnesium.