Abstract: A heliostat includes a frame, a mirror coupled to the frame, a first actuator configured to rotate the mirror about a horizontal axis relative to the frame, a second actuator configured to rotate the mirror about a vertical axis relative to the frame, an angle indicator including data indicating an angle of the mirror relative to the frame, a time keeper, and a computing system. The computing system includes a processor, a memory, and a wireless communications interface. The computing system calculates a sun position using the time keeper, determines an approximate mirror angle to reflect sunlight towards a target by utilizing the sun position, a location of the frame, and an approximate alignment of the frame relative the target, and automatically adjusts the mirror to the approximate mirror angle based on the angle indicator by activating the first and second actuators.

Abstract: An overcurrent protection circuit for an analog modem which uses passive-device features during normal operation to minimize modem signal noise and distortion, and active-device features when inadvertently connected to a line having excessive line current.