Abstract: A method is provided. The method comprises receiving design criteria for a fixed microwave network; identifying proximate interfering signals; determining whether interference levels satisfy design criteria of the fixed microwave network; and if the interference levels do not satisfy the design criteria, then optimize operating parameters of radio systems of the fixed microwave network.

Abstract: A method is provided. The method comprises receiving design criteria for a fixed microwave network; identifying proximate interfering signals; determining whether interference levels satisfy design criteria of the fixed microwave network; and if the interference levels do not satisfy the design criteria, then optimize operating parameters of radio systems of the fixed microwave network.

Abstract: A test head for an integrated circuit tester includes a main chassis defining a chamber that is open at the top. Tester modules are installed in the chamber, each tester module being removable as a unit from the chamber and including a tester module chassis, multiple pin electronics cards, and a tester module interface structure exposed at the top of the chamber. A test head interface structure is engageable with the tester module interface structures of the tester modules for connecting the tester module interface structures to a device interface unit.

Abstract: A test head for an integrated circuit tester includes a main chassis defining a chamber that is open at the top. Tester modules are installed in the chamber, each tester module being removable as a unit from the chamber and including a tester module chassis, multiple pin electronics cards, and a tester module interface structure exposed at the top of the chamber. A test head interface structure is engageable with the tester module interface structures of the tester modules for connecting the tester module interface structures to a device interface unit.

Abstract: An air delievery monitoring system covers an aperture of an air duct with an insert having a bore. A filter element in communication with the inside of that air duct through that bore is made accessible from outside of that duct. Air escapes from the duct through the bore in the insert to the filter element which traps contaminants in such air for subsequent laboratory analysis. The filter element is preferably encapsulated in an apertured filter element housing which is mounted in the insert in communication with its bore. After removal of that housing from the insert, the contaminated filter element can be transported or sent to the laboratory for the performance of several analyses thereon.

Abstract: A differential plane mirror interferometer comprises a source (10) which emits a light beam containing two linear orthogonally polarized components; a beamsplitter/beam folder assembly (16, 16A) for converting the input beam into two separated, parallel, orthogonally polarized beams; a half-wave retardation plate (29A, 29) located in one of the separated beams to produce two separated parallel beams with the same polarization; means including a polarizing beamsplitter (44), for causing each of the separated parallel beams with the same polarization to be reflected twice by one of two plane mirrors (71, 70) to produce two parallel output beams with the same polarization; a half-wave retardation plate (29B, 29) located in one of the separated parallel output beams, with the beamsplitter/beam folder assembly (16, 16B) converting the two separated parallel orthogonally polarized output beams into a single output beam in which the phase difference between the two polarization components of the single output beam i

Abstract: A differential plane mirror interferometer comprises a source (10) which emits a light beam containing two orthogonally polarized components of different frequencies; a source of a stabilized electrical reference signal (11) of a frequency corresponding to a difference frequency between the two components of the light beam; a beamsplitter/beam folder assembly (16, 16A) for converting the input beam into two separated, parallel, orthogonally polarized beams; a half-wave retardation plate (29A, 29) located in one of the separated beams to produce two separated parallel beams with the same polarization; means including a polarizing beamsplitter (44), for causing each of the separated parallel beams with the same polarization to be reflected twice by one of two plane mirrors (71, 70) to produce two parallel output beams with the same polarization; a half-wave retardation plate (29B, 29) located in one of the separated parallel output beams, with the beamsplitter/beam folder assembly (16, 16B) converting the two s

Abstract: An interferometer system capable of measuring accurately the deviations from straightness of travel comprises a source (10) of a frequency stabilized input beam (12) with two linear orthogonally polarized components which may or may not be of the same frequency; a tilted parallel plate or shear plate (16) with regions of reflection, antireflection, and polarizing coatings, for converting the input beam into two separated, parallel, orthogonally polarized beams (30, 31); a half-wave retardation plate (24), located in one of the separated beams (31), for converting the two separated, orthogonally polarized beams into first and second beams which are spatially separated, parallel, and have the same polarization (30, 33); a polarizing beamsplitter (40) and quarter-wave retardation plate (44) for transmitting the first and second beams (34, 35) to a prism assembly (45), attached to the mechanical apparatus whose straightness of travel is to be measured, for refracting the parallel first and second beams (36, 37) i