Xetron Corporation

Northrop Grumman Systems Corporation

James H Kreger

Eugene A Janning, Jr

Peter James Folberth

An apparatus for providing pan and tilt capability to a stationary imaging device comprises a first achromatic prism doublet positioned on a first axis, a second achromatic prism doublet positioned on the first axis, and at least one motor for rotating the first and second achromatic prism doublets about the first axis whereby polychromatic electromagnetic radiation from a portion of an area of interest is directed toward an imaging device. A method of using the apparatus is also provided.

Pan and tilt apparatus using achromatic prisms

A binary capacitor consists of a piston having a metallized band on its periphery. The piston is movable between first and second positions within a cylinder which carries two spaced metallized bands. One of the positions of the piston defines a position of maximum capacitance, i.e. where the band on the piston overlaps both of the cylinder bands. The second position of the piston defines a position of minimum capacitance; i.e. where the piston band clears at least one of the cylinder bands. The piston is latched in its stable minimum and maximum states by fixed permanent magnets located at the ends of the piston in combination with soft iron slugs at the ends of the cylinder. The piston is moved by appropriately energizing electromagnetic coils wound over the soft iron slugs on the cylinder.

Binary capacitor

A radio frequency FM repeater system receives and retransmits at the same frequency, the retransmitted signal having the same deviation as the received signal. To accomplish this the IF filter is notched at its center frequency and the receiver feedback loop is inhibited when the received IF is within the notch, i.e., at the IF center frequency. In addition, the system is stabilized and the deviations of the received and retransmitted signals are kept equal by using positive feedback within the FM receiver, the feedback loop having a gain of 0.5.

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Cincinnati, OH, United States of America

James H Kreger