Abstract: A system and method of the disclosure relates to satellite tracking. The system may comprise a tracking receiver that includes a first analog-to-digital (A/D) converter coupled between a sum input and a digital signal processor (DSP), a second A/D converter coupled between a difference input and the DSP, and a calibration output coupled to the sum input and coupled to the difference input. The first A/D converter may convert an signal received at the sum input into a sum digital signal, and provide the sum digital signal to the DSP. The second A/D converter may convert an signal received at the difference input into a difference digital signal, and provide the difference digital signal to the DSP. The tracking receiver may generate an calibration signal and provide the calibration signal through the calibration output.

Abstract: A grip for a weapon accessory rail, in which the grip is latched into any position on the accessory rail by a plastic compression latch which is inserted through the side of the grip, and is designed to be removed with the aid of a cartridge, or alternatively by a user depressing a button on the latch through a hole in the grip. The grip is manufactured by overmolding, allowing a variety of textures to be formed thereon, and allowing the material of the overmolded part to be selected for maximum grip, whilst the material of the core of the grip can be selected for maximum strength.

Abstract: A nut for use on roadways, runways, in reinforced concrete construction, and the like, possesses a generally circular shape, with spherical top and bottom surfaces connected by a cylindrical side wall. A central aperture formed through the nut is threaded for engagement with an anchor bolt secured in a roadway surface by a conventional epoxy. Four smaller diameter threaded apertures are disposed on a common circle adjacent a peripheral edge of the nut, evenly spaced at ninety degree angular increments. The smaller diameter apertures are utilized in conjunction with a spanner wrench to tighten the nut on an anchor bolt. After the nut is tightened securely into position, an externally threaded drill guide bushing is engaged within each of the four smaller diameter apertures and utilized to drill a coaxial cylindrical bore in the roadway surface.