Abstract: The invention relates to a self monitoring/calibrating phased array radar in which the operating path for transmission and the operating path for reception may be monitored/calibrated by the addition of a corporate calibration network coupled at the plural end to the antenna elements and at the singular end to the exciter/receiver, and switching means to selectively route the monitoring/calibrating signal derived from the exciter in a transmit path to calibration path sequence or in a calibration path to receive path sequence.In one embodiment of the invention, a phase shifter common to transmit and receive paths is adjustable in increments under active logical control for calibration, while power and gain performance is monitored but not actively controlled. A novel T/R sub-assembly houses the operating electronics for four antenna elements in the form of four T/R modules with a one to four divider network in the transmit/receive path and in the calibration path.

Abstract: A retractable distributed array antenna has a multiplicity of radiative elements arranged in a beam-forming array of desired configuration and resolvable into a plurality C of columns, with each column having at least one of the antenna radiator elements. Each of a number P of elongated column members, up to but not exceeding C in number, supports the antenna elements of an associated column. The column members are arranged with their elongated dimension generally parallel to one another. The adjacent end portions of each pair of column member, or of a column member and a central stowage module, are joined by a spring-loaded hinge assembly, which urges the joined column member end portions away from each other, to place the columns of elements into the desired distributed array antenna configuration, if no retroactive forces are present.

Abstract: A sheet feeder for handling envelopes and the like in which a flexible retard pad projects into the feeder discharge opening, the upper part of the pad being unsupported with the lower part supported in an inclined position so that on feeding movement of an envelope from the tray, the leading edge of the topmost envelope strikes the unsupported part of the pad to deflect the pad out of the way while the leading edges of other envelopes in the tray that are carried forward by feeding of the topmost envelope engage the supported part of the retard pad and are prevented by the pad from being fed.

Abstract: A portable stand having a frictionally adjustable receiver for a surveyor's rod permits plumbing of the rod and maintains the rod vertical and stationary with respect to a point on the ground.

Abstract: A portable stand having a frictionally adjustable receiver for a surveyor's rod permits plumbing of the rod and maintains the rod vertical and stationary with respect to a point on the ground.

Abstract: A device functioning as a combined backstop and brake for a rotating member. A pivotably mounted spring biased arm rides against a band of resilient material adapted to rotate with the member. The arm thereby frictionally applies a controlled braking force to the rotating member. Reverse rotation of the member causes the arm to depress the resilient material of the band and prevent such reverse motion.