Abstract: Overhead wall mounted cat platform system with multiple access wherein access is provided by a carpeted pole or by one or more inclined suspension bridges. Each bridge comprises a plurality of spaced platforms. The platforms are interconnected by ropes and suspended from support ropes by connector ropes extending between the support ropes and the step ropes.

Abstract: A delay line frequency discriminator having application to microwave equipment and particularly used for stabilizing an oscillator, including a first coupler supplied by the oscillator and connected to a second coupler by means of two electromagnetic transmission lines, wherein one of the transmission lines introduces a delay time .tau. compared with the other line. The second coupler delivers a sum signal which is the stabilized output signal of the oscillator and a difference signal to a third coupler which is also fed with a sampled portion of the output signal of the oscillator and supplies the oscillator via a detector and an amplifier.

Abstract: The system according to the invention utilizes a transmission--reception radar antenna protected by a radome and an interrogation antenna having at least one set of two networks engaged laterally on the outer wall of the radome. The networks are arranged symmetrically to an axis of revolution of the radome. Supply means supply the interrogation antenna with an ultra-high frequency interrogation signal and the switching and phase-displacement means and the networks constitute an electronic scanning antenna.

Abstract: The invention relates to a printed monopulse primary source for a radar antenna.The primary source has, arranged on a first face of a dielectric material substrate, radiating zones forming independent site and bearing difference and sum channels. A receiving supply circuit for the radiating zones is arranged on a second face of the substrate, opposite to the first face. Connecting means ensure the electrical connection of the radiating zones to the receiving supply circuit in the thickness of the substrate.Application to airport radar systems.

Abstract: Inverse Cassegrain antenna making it possible to use on the one hand the qualities of a conventional fine beam for look-out and tracking functions and making it possible on the other hand to have a widened beam either in the elevation plane or in the bearing plane. According to one embodiment, this antenna is provided with a mirror constituted by two reflector - polarizer elements joined to one another by a hinge which permits the articulation thereof, a remote control device regulating their relative orientation.