Abstract: A system for determining the magnitude or value of the VSWR of an RF transmission system is disclosed. A VSWR value is preselected, and the ratio of reflected voltage to forward voltage for the system for a preselected VSWR is determined. The ratio is multiplied by the absolute value of the measured instantaneous forward RF voltage, giving a predicted value for the actual reflected voltage. The reflected voltage is measured, and the predicted and actual values are compared. The actual VSWR bears the same relationship to the predetermined VSWR that the actual reflected voltage bears to the predicted reflected voltage. To determine the actual value of the VSWR, a counter which contains the preselected VSWR value is incremented or decremented as a result of the comparison until the difference changes sign. The predetermined VSWR employed for the final comparison, which value is still stored in the counter, is sent to the display circuit, as the actual VSWR.
Abstract: A control for a batch bin and a continuous loss bin system having a separate weight measuring device for each bin whose sum at transfer is used to establish continuously digitally desired weights at fixed intervals to be compared with the actual weight in the continuous loss bin to provide an error signal for a continuous feeder.
April 14, 1977
Date of Patent:
September 5, 1978
H. F. Henderson Industries
William H. Ward, Henry F. Henderson, Jr., Kenneth H. Kardux