Abstract: An antenna mounting structure is supported and oriented by three linear hydraulic actuators responsive to linear position transducers of a passive stabilization system serving as a vertical reference for keeping an antenna precisely pointed at a geostatically satellite during motion disturbances. The antenna is assembled with each of the linear actuators connected thereto through a gimbaled mount which facilitates accommodation of the requisite angulation thereof necessitated by motion in adjacent actuators. Response in each actuator is derived through an independent linear servo loop directly communicating with a linear position transducer constructed in scaled replication of the respective antenna actuator geometrical configuration and assembled to an inertially stabilized platform.

Abstract: The specification discloses a transmission for varying the mechanical advantage in the power train of a bicycle. The transmission includes a drive sprocket attached to one wheel of the bicycle for driving the wheel and a fixed pitch sheave mounted on the bicycle frame. An endless chain is entrained between the drive sprocket and fixed pitch sheave. A rotatable variable pitch sheave is mounted to move relative to the fixed pitch sheave and is operatively connected to the fixed pitch sheave by a V-belt passing therebetween.A pedal sprocket is rotatably mounted on the bicycle frame and connected by way of a chain to the variable pitch sheave for rotating the variable pitch sheave. The rotation of the variable pitch sheave by the pedal sprocket causes the movement of the variable pitch sheave relative to the fixed pitch sheave to vary the mechanical advantage therebetween.