Abstract: Angle-position is determined by relative angular rotation between a capacitive track and a capacitive pick-up probe. The capacitive track is disposed along the region of angular interest. The pick-up probe is oriented broadside to the capacitive track and closely spaced therefrom thus establishing a measurable capacity thereacross. As the capacitive track moves angularly relatively to the pick-up probe, a geometric asymmetry is produced therebetween causing the capacity that exists thereacross to change unambiguously and in a manner that exhibits analog correspondence with relative angular rotation.

Abstract: An angle-position transducer using light-interrogation employs an optical track and a beam of light. The light beam is formed into a narrow line-pattern. The line-pattern is directed to impinge on the optical track as the optical track moves angularly relative to the line-pattern. The optical track and line-pattern interact in a way that alters the line-pattern unambiguously. A target detector intercepts the altered radiation and applies a proportional signal to electronic means for digital display.

Abstract: An antenna having a unique method of feed is comprised of a vertical radiator and a driven element. The driven element is defined by an integral, substantially straight part. RF energy is fed into or extracted from the antenna by a coil perimetrically wound around the straight part of the driven element. Preferably, this coil is comprised of the exposed, insulated inner conductor of a coaxial cable. The coil covers a relatively large segment along the periphery of the driven element giving rise to unique electrical properties. With this method of feed, the antenna exhibits good bandwidth and requires no metal-to-metal contact between feedline and antenna.