Abstract: A redundant channel control system includes one or more voters having a high-pass filter connected between a pair of voter inputs.

Abstract: An air erected gyro includes an erection-force producing air stream and gravity-responsive valve means whose gate portion is movable across the air stream so as to vary the erection force magnitude. Also included is a compensator means connected for movement with the gate and for also confronting the air stream so as to at least partially counteract air stream induced horizontal coercive effects on the valve means position.

Abstract: A postdetection, digital radar signal processor for producing information for a PPI type display on a conventional CRT. Each line of the polar or PPI type display represents a summing of past and present returns received at substantially the same antenna position during past and present antenna scans. SUThis invention relates to electronics and more particularly to digital processors for use with radar systems.Storage tubes, or electrostatic memory tubes, are widely used for radar indicators. The information painted thereon is retained by electric charges and thus such tubes can provide to the operator a continuous map of the system observed space. However, storage tubes are expensive, unstable, and have limited dynamic range. They also require critical adjustments.Previous attempts to replace the storage tube in airborne weather radar applications with a conventional CRT (cathode ray tube) and digital memory have had some success and also some shortcomings.

Abstract: An amplitude modulation (AM) removal circuit comprising a phaselock loop. A phaselock VOR receiver includes said AM removal circuit.

Abstract: In a helicopter a servo system connected to operate in parallel with the rotor blade pitch controlling linkages and also to receive autopilot generated signals directing maneuvers. The system limits the autopilot control over the blade pitch or position in the short term and permits full control over the long term.

Abstract: Method and apparatus for limiting the authority of a position servo system over an aircraft control surface. The amplitude of the energizing signal delivered to the actuator portion of the servo system is limited in accordance with a non-constant function of time.

Abstract: An input tracking threshold detector includes a first circuit receiving input signal, a feedback signal, and a predetermined gating signal. The first circuit outputs a binary signal which during gating signal enablement intervals is indicative of the relative amplitudes of the input and feedback signals. The feedback signal is developed from the first circuit output by a second circuit whose output signal amplitude is indicative of the duty cycle of its input.

Abstract: An incremental type shaft position encoder which provides a distinguishable signal at each of a plurality of predetermined shaft rotational positions, and which further provides a unique electrical signature associated with each of predetermined ones of the signals.

Abstract: Method and apparatus for controlling aircraft flight control surfaces. A signal indicative of control surface movement rate is provided and tested for level and duration. When said rate indicative signal exceeds a predetermined level for a predetermined time, authority of positioning apparatus over the aircraft control surface is reduced.

Abstract: An electromagnetic wave guiding rotary joint admitting of rotary motion about two or more axes. A spherical journal and a complementary spherical race afford electromagnetic communication between two wave guiding means.

Abstract: Method and apparatus for reducing phaselock loop FM'ing without disturbing the loop filter. After the loop is locked, the loop filter input signal is changed so that high frequency components therein are increased in intensity and yet the average value of this signal is substantially unchanged.

Abstract: A torque motor incorporating a permanent magnet rotor and winding therewith for providing the indicating mechanism of a servoed indicating unit. The circuitry for use with the indicating mechanism first applies a reference feedback-producing pulse, then provides the signal for application of torque to the indicator to move it toward the desired position, and then has a quiescent period to clear the stator windings of the mechanism of currents before recommencing the voltage reference and torquing cycle.

Abstract: Phaselock circuitry including means for providing a frequency variable feedback signal and a phase detector receiving the input signal and the feedback signal. The phase detector provides pulses whose width and average value are dependent on the phase relationship between the input and feedback signals.

Abstract: A post type electrical terminal having at one end at least one channel for receiving electrical wires. This channel follows a nonlinear path so as to impose a bend in any wire inserted therein.

Abstract: Phaselock circuitry including phaselock loop means having an input signal and a feedback signal. Two signals S.sub.X and S.sub.Y are provided which are synchronous respectively with the input signal and the feedback signal. A decision circuit provides a lock or no-lock indication based on the degree of concurrence between S.sub.X and S.sub.Y.

Abstract: Digital function generator apparatus providing an output Y from an input X according to ##EQU1## Included in the apparatus is a digital memory, a digital adder, a digital multiplier, and also timing control means.

Abstract: A backlighted display apparatus including a light source, and a display means having both transparent areas and light diffusing areas. Located therebetween is light refractive means for concentrating and controlling light illuminating the display means. Light absorptive means are appropriately disposed to provide contrast.

Abstract: A signal presence detector selective over at least a frequency range of F.sub.L to F.sub.H. The detector includes timing signal generating means, clock signal generating means, and means responsive to both of these for providing, in a predetermined manner, a time window following each timing indication. Also included is means for detecting time coincidence between certain time windows and certain timing indications.

Abstract: A reflective type display apparatus comprising display means having light scattering areas and transparent areas backed by light reflective means. Transparent light refracting means is disposed at the front of the display means and has nonparallel front and rear surfaces. Light absorptive means is disposed between the front surface and the display means and outside the region of transparency between the display means and an observer.

Abstract: A torque motor incorporating a permanent magnet rotor and winding therewith for providing the indicating mechanism of a servoed indicating unit. The circuitry for use with the indicating mechanism first applies a reference feedback-producing pulse, then provides the signal for application of torque to the indicator to move it toward the desired position, and then has a quiescent period to clear the stator windings of the mechanism of currents before recommencing the voltage reference and torquing cycle.