Abstract: An arrangement for testing the performance of an electronic system utilizing a phased array antenna as its principal radiator into a predetermined sector of space includes, as one of its main components, an enclosure which bounds a miniature anechoic chamber located in the near-field region of the antenna array during the performance of a testing operation and lined with material that absorbs free space electromagnetic radiation. The enclosure has an opening that is aligned with the phased array antenna the performance of which is being tested. Two dual-polarized testing horn antennas are situated at a wall of the enclosure that is opposite to the wall provided with the opening. Electrical signals received from the horn antennas and representative of the near-field electromagnetic radiation emitted by the phased array antenna are supplied to an evaluating circuit which gives indication of the performance of the electronic system of the phased array antenna.

Abstract: A device is disclosed by which a portable receptacle can be inserted onto, secured to and extracted from a stationary support. The device utilizes a pair of cooperating securing members, one of which is attached to the support and the other of which is attached to the receptacle. The securing member on the receptacle is stationary. The other securing member is movable linearly and rotatably. When the two securing members are engaged with each other, they can cooperate in connection with the insertion, securement and extraction of the receptacle.

Abstract: There is disclosed an electronic float switch circuit which employs simple immersion probes, one of which is associated with a high fluid level and the other with a low fluid level. Each of the immersion probes operates in conjunction with an oscillator, a detector and a comparator. Essentially, when the associated immersion probe is immersed in a fluid, the oscillator ceases oscillations which therefore provides a first low voltage level via the detector to the comparator to therefore change the state of the comparator. The comparator associated with the high and low level probes operate to set and reset a DC flip-flop which in turn controls an opto-isolator device to trigger a triac. The triac operates the pump. When the fluid level reaches below the level of the low probe, the circuit is disabled allowing the vessel again to be filled with water to allow the pump to operate between the high and low levels by means of the electronic circuit.

Abstract: This invention relates to a system for detecting submerged objects by receiving an incident indication of electromagnetic energy and also the reflection of said energy caused by the presence of a submerged object and to comapre the field strength of the incident radiation with the field strength of the reflected radiation to determine the relation therebetween, the relation being a measure of the object location.