Abstract: The present invention involves a transmitting antenna system that includes at least one high impedance transmitting antenna element, a voltage sampling device, and monitoring equipment. The antenna element(s) each have a driving point that receives radio signals from a radio frequency power source. A voltage sampling device measures the voltage magnitude and phase of the radio signal at the driving point of each antenna elements. A voltage sampling device is physically located near each of the antenna elements being monitored and each voltage sampling device transmits information relating to phase and voltage magnitude to the monitoring equipment that is located remote of at least one of the antenna elements. The monitoring equipment can compare the phase and voltage magnitude of each of the antenna elements in the transmitting antenna system to a pre-determined set of values and/or to the values of the other antenna element(s) in the transmitting antenna system.

Abstract: Driving circuitry is disclosed for electrochromic displays, the driving circuits providing specific characteristics necessary for such displays. Particularly, apparatus is provided to minimize variations in the optical density and in the contrast between the various segments of a device. Further, simultaneous coloring and bleaching signals are provided to the display, thereby avoiding an undesired visual effect of unsynchronized formation for a character on a display device. The circuitry moreover includes components to prevent repeated energization of a segment in a display device. Additionally, circuitry is provided for generating bleach and color signals for the display. Additionally, a power supply for electrochromic displays, requiring bipolar outputs, is disclosed utilizing a single, unipolar, unregulated source therein.